watchdog: at91sam9_wdt: prevent timer rearm during teardown

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Summary

CVECVE-2026-74687
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:43 UTC
Updated2026-08-22 16:16:43 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5161b31dc39a6d6dadc95f298de48a725b73ada8 29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed git Not specified
CNA Linux Linux affected 5161b31dc39a6d6dadc95f298de48a725b73ada8 b7949b0a7d998013b7ec8617a0ef5b07cca80be4 git Not specified
CNA Linux Linux affected 5161b31dc39a6d6dadc95f298de48a725b73ada8 8444d66aa6b6e7fe0a26fa1a00a11cb4d0523783 git Not specified
CNA Linux Linux affected 3.14 Not specified
CNA Linux Linux unaffected 3.14 semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8444d66aa6b6e7fe0a26fa1a00a11cb4d0523783 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b7949b0a7d998013b7ec8617a0ef5b07cca80be4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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