GHSA-CFRW-47V4-WFC7

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33
VLAI
Details

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

media: mtk-jpeg: fix use-after-free in release path due to uncancelled work

The mtk_jpeg_release() function frees the context structure (ctx) without first cancelling any pending or running work in ctx->jpeg_work. This creates a race window where the workqueue callback may still be accessing the context memory after it has been freed.

Race condition:

CPU 0 (release)                    CPU 1 (workqueue)
----------------                   ------------------
close()
  mtk_jpeg_release()
                                   mtk_jpegenc_worker()
                                     ctx = work->data
                                     // accessing ctx

    kfree(ctx)  // freed!
                                     access ctx  // UAF!

The work is queued via queue_work() during JPEG encode/decode operations (via mtk_jpeg_device_run). If the device is closed while work is pending or running, the work handler will access freed memory.

Fix this by calling cancel_work_sync() BEFORE acquiring the mutex. This ordering is critical: if cancel_work_sync() is called after mutex_lock(), and the work handler also tries to acquire the same mutex, it would cause a deadlock.

Note: The open error path does NOT need cancel_work_sync() because INIT_WORK() only initializes the work structure - it does not schedule it. Work is only scheduled later during ioctl operations.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46011"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:19Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mtk-jpeg: fix use-after-free in release path due to uncancelled work\n\nThe mtk_jpeg_release() function frees the context structure (ctx) without\nfirst cancelling any pending or running work in ctx-\u003ejpeg_work. This\ncreates a race window where the workqueue callback may still be accessing\nthe context memory after it has been freed.\n\nRace condition:\n\n    CPU 0 (release)                    CPU 1 (workqueue)\n    ----------------                   ------------------\n    close()\n      mtk_jpeg_release()\n                                       mtk_jpegenc_worker()\n                                         ctx = work-\u003edata\n                                         // accessing ctx\n\n        kfree(ctx)  // freed!\n                                         access ctx  // UAF!\n\nThe work is queued via queue_work() during JPEG encode/decode operations\n(via mtk_jpeg_device_run). If the device is closed while work is pending\nor running, the work handler will access freed memory.\n\nFix this by calling cancel_work_sync() BEFORE acquiring the mutex. This\nordering is critical: if cancel_work_sync() is called after mutex_lock(),\nand the work handler also tries to acquire the same mutex, it would cause\na deadlock.\n\nNote: The open error path does NOT need cancel_work_sync() because\nINIT_WORK() only initializes the work structure - it does not schedule\nit. Work is only scheduled later during ioctl operations.",
  "id": "GHSA-cfrw-47v4-wfc7",
  "modified": "2026-05-27T15:33:20Z",
  "published": "2026-05-27T15:33:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46011"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0498b27a1542021d90269d58347501d4c3ccd84e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2209fdae5c2f615930c9af1379c1cfca199ec5d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26506a30e0e26d612f82a7bf0e395626968a44e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/34c519feef3e4fcff1078dc8bdb25fbbbd10303f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e78c39f720679fcf3a2eacd82725ec3ea2648301"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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