ghsa-6wf9-7vfw-cj9r
Vulnerability from github
Published
2025-01-06 18:31
Modified
2025-01-06 18:31
Details

In the Linux kernel, the following vulnerability has been resolved:

io_uring/sqpoll: fix sqpoll error handling races

BUG: KASAN: slab-use-after-free in __lock_acquire+0x370b/0x4a10 kernel/locking/lockdep.c:5089 Call Trace: ... _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0xb5/0x23c0 kernel/sched/core.c:4205 io_sq_thread_park+0xac/0xe0 io_uring/sqpoll.c:55 io_sq_thread_finish+0x6b/0x310 io_uring/sqpoll.c:96 io_sq_offload_create+0x162/0x11d0 io_uring/sqpoll.c:497 io_uring_create io_uring/io_uring.c:3724 [inline] io_uring_setup+0x1728/0x3230 io_uring/io_uring.c:3806 ...

Kun Hu reports that the SQPOLL creating error path has UAF, which happens if io_uring_alloc_task_context() fails and then io_sq_thread() manages to run and complete before the rest of error handling code, which means io_sq_thread_finish() is looking at already killed task.

Note that this is mostly theoretical, requiring fault injection on the allocation side to trigger in practice.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-56762"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-01-06T17:15:41Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/sqpoll: fix sqpoll error handling races\n\nBUG: KASAN: slab-use-after-free in __lock_acquire+0x370b/0x4a10 kernel/locking/lockdep.c:5089\nCall Trace:\n\u003cTASK\u003e\n...\n_raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162\nclass_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]\ntry_to_wake_up+0xb5/0x23c0 kernel/sched/core.c:4205\nio_sq_thread_park+0xac/0xe0 io_uring/sqpoll.c:55\nio_sq_thread_finish+0x6b/0x310 io_uring/sqpoll.c:96\nio_sq_offload_create+0x162/0x11d0 io_uring/sqpoll.c:497\nio_uring_create io_uring/io_uring.c:3724 [inline]\nio_uring_setup+0x1728/0x3230 io_uring/io_uring.c:3806\n...\n\nKun Hu reports that the SQPOLL creating error path has UAF, which\nhappens if io_uring_alloc_task_context() fails and then io_sq_thread()\nmanages to run and complete before the rest of error handling code,\nwhich means io_sq_thread_finish() is looking at already killed task.\n\nNote that this is mostly theoretical, requiring fault injection on\nthe allocation side to trigger in practice.",
  "id": "GHSA-6wf9-7vfw-cj9r",
  "modified": "2025-01-06T18:31:04Z",
  "published": "2025-01-06T18:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56762"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6237331361711810d8f2e3fbfe2f7a6f9548f5e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80120bb4eef7848d5aa3b1a0cd88367cd05fbe03"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e8494c83cf73168118587e9567e4f7e50ce4fd8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e33ac68e5e21ec1292490dfe061e75c0dbdd3bd4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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