CVE-2026-68357 (GCVE-0-2026-68357)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-19 16:34
VLAI
Title
watchdog: pretimeout: Fix UAF in watchdog_unregister_governor()
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < b9ae33faa96bdec6bc60e4c5f8f53786182e4207 (git)
Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 472ec1e34ff0bb26379805cae808f658cce58c35 (git)
Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 7a2ee3ec6f208307eca1119a343c7b5d39c03708 (git)
Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 2e47b91b9b4020fcc01def14d6b6556d66074cf4 (git)
Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 0ca252720f0e38411cfec3431db9bb1aed0a412c (git)
Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 7d1658b066de30f4b23afc14814d22416a971e6e (git)
Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 7993d626983cc58fbde9607333cfd2d57725c197 (git)
Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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    "datePublished": "2026-08-10T12:03:34.241Z",
    "dateReserved": "2026-07-30T09:28:09.385Z",
    "dateUpdated": "2026-08-19T16:34:05.347Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-11T12:30:10+00:00",
      "cve": "CVE-2026-68357",
      "id": "CVE-2026-68357",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: watchdog: pretimeout: Fix UAF in watchdog_unregister_governor()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68357.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-11T23:46:30Z",
      "cve": "CVE-2026-68357",
      "id": "CVE-2026-68357",
      "initial_release_date": "2026-08-11T23:46:30Z",
      "product_status:known_affected": "191",
      "product_status:known_not_affected": "105",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68357",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68357.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.