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CVE-2026-68357

Estado: RecibidaSin puntuar—

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`.

Leer descripción completaMostrar menos

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

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-68357",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "version": "da0d12ff2b829a35e9921918e925d79497b82bef",
              "lessThan": "b9ae33faa96bdec6bc60e4c5f8f53786182e4207",
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              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver",
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            },
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              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.183",
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              "lessThanOrEqual": "6.1.*"
            },
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              "version": "6.6.148",
              "versionType": "semver",
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            },
            {
              "status": "unaffected",
              "version": "6.12.101",
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            },
            {
              "status": "unaffected",
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              "version": "7.1.6",
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              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/watchdog/watchdog_pretimeout.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-10T13:20:28.160",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0ca252720f0e38411cfec3431db9bb1aed0a412c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "url": "https://git.kernel.org/stable/c/7d1658b066de30f4b23afc14814d22416a971e6e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/b9ae33faa96bdec6bc60e4c5f8f53786182e4207",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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->gov` reassigned to the dangling `default_gov`.\n\nFix the UAF by clearing `default_gov` if it matches the governor being\nunregistered."
    }
  ],
  "lastModified": "2026-08-19T17:20:45.310",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}