FKIE_CVE-2026-68357

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-19 17:20
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0ca252720f0e38411cfec3431db9bb1aed0a412c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e47b91b9b4020fcc01def14d6b6556d66074cf4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/472ec1e34ff0bb26379805cae808f658cce58c35
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7993d626983cc58fbde9607333cfd2d57725c197
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a2ee3ec6f208307eca1119a343c7b5d39c03708
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d1658b066de30f4b23afc14814d22416a971e6e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9ae33faa96bdec6bc60e4c5f8f53786182e4207
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/watchdog/watchdog_pretimeout.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b9ae33faa96bdec6bc60e4c5f8f53786182e4207",
              "status": "affected",
              "version": "da0d12ff2b829a35e9921918e925d79497b82bef",
              "versionType": "git"
            },
            {
              "lessThan": "472ec1e34ff0bb26379805cae808f658cce58c35",
              "status": "affected",
              "version": "da0d12ff2b829a35e9921918e925d79497b82bef",
              "versionType": "git"
            },
            {
              "lessThan": "7a2ee3ec6f208307eca1119a343c7b5d39c03708",
              "status": "affected",
              "version": "da0d12ff2b829a35e9921918e925d79497b82bef",
              "versionType": "git"
            },
            {
              "lessThan": "2e47b91b9b4020fcc01def14d6b6556d66074cf4",
              "status": "affected",
              "version": "da0d12ff2b829a35e9921918e925d79497b82bef",
              "versionType": "git"
            },
            {
              "lessThan": "0ca252720f0e38411cfec3431db9bb1aed0a412c",
              "status": "affected",
              "version": "da0d12ff2b829a35e9921918e925d79497b82bef",
              "versionType": "git"
            },
            {
              "lessThan": "7d1658b066de30f4b23afc14814d22416a971e6e",
              "status": "affected",
              "version": "da0d12ff2b829a35e9921918e925d79497b82bef",
              "versionType": "git"
            },
            {
              "lessThan": "7993d626983cc58fbde9607333cfd2d57725c197",
              "status": "affected",
              "version": "da0d12ff2b829a35e9921918e925d79497b82bef",
              "versionType": "git"
            },
            {
              "lessThan": "7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661",
              "status": "affected",
              "version": "da0d12ff2b829a35e9921918e925d79497b82bef",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/watchdog/watchdog_pretimeout.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-68357",
  "lastModified": "2026-08-19T17:20:45.310",
  "metrics": {},
  "published": "2026-08-10T13:20:28.160",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0ca252720f0e38411cfec3431db9bb1aed0a412c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2e47b91b9b4020fcc01def14d6b6556d66074cf4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/472ec1e34ff0bb26379805cae808f658cce58c35"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7993d626983cc58fbde9607333cfd2d57725c197"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7a2ee3ec6f208307eca1119a343c7b5d39c03708"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7d1658b066de30f4b23afc14814d22416a971e6e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b9ae33faa96bdec6bc60e4c5f8f53786182e4207"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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