Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected da0d12ff2b829a35e9921918e925d79497b82bef before b9ae33faa96bdec6bc60e4c5f8f53786182e4207; affected da0d12ff2b829a35e9921918e925d79497b82bef before 472ec1e34ff0bb26379805cae808f658cce58c35; affected da0d12ff2b829a35e9921918e925d79497b82bef before 7a2ee3ec6f208307eca1119a343c7b5d39c03708; affected da0d12ff2b829a35e9921918e925d79497b82bef before 2e47b91b9b4020fcc01def14d6b6556d66074cf4; affected da0d12ff2b829a35e9921918e925d79497b82bef before 0ca252720f0e38411cfec3431db9bb1aed0a412c; affected da0d12ff2b829a35e9921918e925d79497b82bef before 7d1658b066de30f4b23afc14814d22416a971e6e; affected da0d12ff2b829a35e9921918e925d79497b82bef before 7993d626983cc58fbde9607333cfd2d57725c197; affected da0d12ff2b829a35e9921918e925d79497b82bef before 7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661 |
| Linux / Linux | affected 4.9; unaffected 0 before 4.9; unaffected 5.10.265 through 5.10.*; unaffected 5.15.216 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.148 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
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