GHSA-FJCX-GGVR-3WG6

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

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

watchdog: pretimeout: Fix UAF in watchdog_unregister_governor()

When a watchdog governor is unregistered, it updates existing watchdog devices that were using this governor by falling back to default_gov.

If the governor being unregistered is currently set as default_gov, the default_gov is never cleared. This leads to 2 use-after-free issues: 1. New watchdog devices registered after this point will inherit the dangling default_gov. 2. Existing watchdog devices using the unregistered governor will have their wdd->gov reassigned to the dangling default_gov.

Fix the UAF by clearing default_gov if it matches the governor being unregistered.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68357"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: pretimeout: Fix UAF in watchdog_unregister_governor()\n\nWhen a watchdog governor is unregistered, it updates existing watchdog\ndevices that were using this governor by falling back to `default_gov`.\n\nIf the governor being unregistered is currently set as `default_gov`,\nthe `default_gov` is never cleared.  This leads to 2 use-after-free\nissues:\n1. New watchdog devices registered after this point will inherit the\n   dangling `default_gov`.\n2. Existing watchdog devices using the unregistered governor will have\n   their `wdd-\u003egov` reassigned to the dangling `default_gov`.\n\nFix the UAF by clearing `default_gov` if it matches the governor being\nunregistered.",
  "id": "GHSA-fjcx-ggvr-3wg6",
  "modified": "2026-08-19T18:32:16Z",
  "published": "2026-08-10T15:33:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68357"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ca252720f0e38411cfec3431db9bb1aed0a412c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e47b91b9b4020fcc01def14d6b6556d66074cf4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/472ec1e34ff0bb26379805cae808f658cce58c35"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7993d626983cc58fbde9607333cfd2d57725c197"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a2ee3ec6f208307eca1119a343c7b5d39c03708"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d1658b066de30f4b23afc14814d22416a971e6e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9ae33faa96bdec6bc60e4c5f8f53786182e4207"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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