ghsa-fhjr-hghh-2jv9
Vulnerability from github
Published
2024-05-21 15:31
Modified
2024-05-21 15:31
Details

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

watchdog: Fix possible use-after-free by calling del_timer_sync()

This driver's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free.

Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47321"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:19Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: Fix possible use-after-free by calling del_timer_sync()\n\nThis driver\u0027s remove path calls del_timer(). However, that function\ndoes not wait until the timer handler finishes. This means that the\ntimer handler may still be running after the driver\u0027s remove function\nhas finished, which would result in a use-after-free.\n\nFix by calling del_timer_sync(), which makes sure the timer handler\nhas finished, and unable to re-schedule itself.",
  "id": "GHSA-fhjr-hghh-2jv9",
  "modified": "2024-05-21T15:31:42Z",
  "published": "2024-05-21T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47321"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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