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CVE-2026-74687

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: watchdog: at91sam9_wdt: prevent timer rearm during teardown at91_ping() rearms the watchdog timer from its callback. timer_delete() neither waits for a running callback nor prevents it from rearming the timer, so probe failure or driver removal can leave the timer accessing the devm-allocated at91wdt after it has been freed. Use timer_shutdown_sync() on both teardown paths. It waits for a running callback and rejects any attempt by the callback to rearm the timer.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-22 16:16:43.080000
Last modified
2026-10-30 13:20:03.793000
View original CVE JSON 
{
  "id": "CVE-2026-74687",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-22T16:16:43.080",
  "lastModified": "2026-10-30T13:20:03.793",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: at91sam9_wdt: prevent timer rearm during teardown\n\nat91_ping() rearms the watchdog timer from its callback. timer_delete()\nneither waits for a running callback nor prevents it from rearming the\ntimer, so probe failure or driver removal can leave the timer accessing the\ndevm-allocated at91wdt after it has been freed.\n\nUse timer_shutdown_sync() on both teardown paths. It waits for a running\ncallback and rejects any attempt by the callback to rearm the timer."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nwatchdog: at91sam9_wdt: prevenir el rearme del temporizador durante el desmontaje\n\nat91_ping() rearma el temporizador watchdog desde su callback. timer_delete() ni espera por un callback en ejecución ni le impide rearme el temporizador, por lo que un fallo de sondeo o la eliminación del controlador puede dejar el temporizador accediendo al at91wdt asignado por devm después de que haya sido liberado.\n\nUsar timer_shutdown_sync() en ambas rutas de desmontaje. Espera por un callback en ejecución y rechaza cualquier intento por parte del callback de rearme el temporizador."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/watchdog/at91sam9_wdt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5161b31dc39a6d6dadc95f298de48a725b73ada8",
              "lessThan": "f96c18a766477e5f33d51697963a5c8aed260dae",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5161b31dc39a6d6dadc95f298de48a725b73ada8",
              "lessThan": "a9e0efcb1125e6b452c648671f15920c4955b681",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5161b31dc39a6d6dadc95f298de48a725b73ada8",
              "lessThan": "1beb4dd6a30dea699e98990dd61f892ed1c0985e",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5161b31dc39a6d6dadc95f298de48a725b73ada8",
              "lessThan": "29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5161b31dc39a6d6dadc95f298de48a725b73ada8",
              "lessThan": "b7949b0a7d998013b7ec8617a0ef5b07cca80be4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5161b31dc39a6d6dadc95f298de48a725b73ada8",
              "lessThan": "8444d66aa6b6e7fe0a26fa1a00a11cb4d0523783",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/watchdog/at91sam9_wdt.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "3.14",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "3.14",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.114",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.45",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.9",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1beb4dd6a30dea699e98990dd61f892ed1c0985e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8444d66aa6b6e7fe0a26fa1a00a11cb4d0523783",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a9e0efcb1125e6b452c648671f15920c4955b681",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b7949b0a7d998013b7ec8617a0ef5b07cca80be4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f96c18a766477e5f33d51697963a5c8aed260dae",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}