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.
References6
- git.kernel.org/stable/c/1beb4dd6a30dea699e98990dd61f892ed1c0985e
- git.kernel.org/stable/c/29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed
- git.kernel.org/stable/c/8444d66aa6b6e7fe0a26fa1a00a11cb4d0523783
- git.kernel.org/stable/c/a9e0efcb1125e6b452c648671f15920c4955b681
- git.kernel.org/stable/c/b7949b0a7d998013b7ec8617a0ef5b07cca80be4
- git.kernel.org/stable/c/f96c18a766477e5f33d51697963a5c8aed260dae
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 9 November 2026
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A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.