CVE-2026-68357watchdog: pretimeout: Fix UAF in watchdog_unregister_governor()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from da0d12ff2b829a35e9921918e925d79497b82bef before b9ae33faa96bdec6bc60e4c5f8f53786182e4207; from da0d12ff2b829a35e9921918e925d79497b82bef before 472ec1e34ff0bb26379805cae808f658cce58c35; from da0d12ff2b829a35e9921918e925d79497b82bef before 7a2ee3ec6f208307eca1119a343c7b5d39c03708; from da0d12ff2b829a35e9921918e925d79497b82bef before 2e47b91b9b4020fcc01def14d6b6556d66074cf4; from da0d12ff2b829a35e9921918e925d79497b82bef before 0ca252720f0e38411cfec3431db9bb1aed0a412c; from da0d12ff2b829a35e9921918e925d79497b82bef before 7d1658b066de30f4b23afc14814d22416a971e6e; from da0d12ff2b829a35e9921918e925d79497b82bef before 7993d626983cc58fbde9607333cfd2d57725c197; from da0d12ff2b829a35e9921918e925d79497b82bef before 7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661 | CNA record |
References
- https://git.kernel.org/stable/c/b9ae33faa96bdec6bc60e4c5f8f53786182e4207
- https://git.kernel.org/stable/c/472ec1e34ff0bb26379805cae808f658cce58c35
- https://git.kernel.org/stable/c/7a2ee3ec6f208307eca1119a343c7b5d39c03708
- https://git.kernel.org/stable/c/2e47b91b9b4020fcc01def14d6b6556d66074cf4
- https://git.kernel.org/stable/c/0ca252720f0e38411cfec3431db9bb1aed0a412c
- https://git.kernel.org/stable/c/7d1658b066de30f4b23afc14814d22416a971e6e
- https://git.kernel.org/stable/c/7993d626983cc58fbde9607333cfd2d57725c197
- https://git.kernel.org/stable/c/7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.