ghsa-6mmm-fwjc-qrhc
Vulnerability from github
Published
2024-12-29 09:30
Modified
2025-10-15 18:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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

io_uring: check if iowq is killed before queuing

task work can be executed after the task has gone through io_uring termination, whether it's the final task_work run or the fallback path. In this case, task work will find ->io_wq being already killed and null'ed, which is a problem if it then tries to forward the request to io_queue_iowq(). Make io_queue_iowq() fail requests in this case.

Note that it also checks PF_KTHREAD, because the user can first close a DEFER_TASKRUN ring and shortly after kill the task, in which case ->iowq check would race.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-56709"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-29T09:15:05Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: check if iowq is killed before queuing\n\ntask work can be executed after the task has gone through io_uring\ntermination, whether it\u0027s the final task_work run or the fallback path.\nIn this case, task work will find -\u003eio_wq being already killed and\nnull\u0027ed, which is a problem if it then tries to forward the request to\nio_queue_iowq(). Make io_queue_iowq() fail requests in this case.\n\nNote that it also checks PF_KTHREAD, because the user can first close\na DEFER_TASKRUN ring and shortly after kill the task, in which case\n-\u003eiowq check would race.",
  "id": "GHSA-6mmm-fwjc-qrhc",
  "modified": "2025-10-15T18:31:48Z",
  "published": "2024-12-29T09:30:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56709"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ca94c8de36091067b9ce7527ae8db3812d38781"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f95a2186b7f2af09331e1e8069bcaf34fe019cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/534d59ab38010aada88390db65985e65d0de7d9e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dbd2ca9367eb19bc5e269b8c58b0b1514ada9156"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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