watchdog: at91sam9_wdt: prevent timer rearm during teardown
CVE-2026-74687 · published 22 Aug 2026
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-74687?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 5161b31dc39a6d6dadc95f298de48a725b73ada8 to < a9e0efcb1125e6b452c648671f15920c4955b681, 5161b31dc39a6d6dadc95f298de48a725b73ada8 to < 1beb4dd6a30dea699e98990dd61f892ed1c0985e, 5161b31dc39a6d6dadc95f298de48a725b73ada8 to < 29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed, 5161b31dc39a6d6dadc95f298de48a725b73ada8 to < b7949b0a7d998013b7ec8617a0ef5b07cca80be4
- Linux Linux: 3.14
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/a9e0efcb1125e6b452c648671f15920c4955b681
- git.kernel.org/stable/c/1beb4dd6a30dea699e98990dd61f892ed1c0985e
- git.kernel.org/stable/c/29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed
- git.kernel.org/stable/c/b7949b0a7d998013b7ec8617a0ef5b07cca80be4
- git.kernel.org/stable/c/8444d66aa6b6e7fe0a26fa1a00a11cb4d0523783
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON