watchdog: at91sam9_wdt: prevent timer rearm during teardown (CVE-2026-74687) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-74687

watchdog: at91sam9_wdt: prevent timer rearm during teardown

Answer in brief

CVE-2026-74687 records a Unknown severity vulnerability in watchdog: at91sam9_wdt: prevent timer rearm during teardown. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 22, 2026Updated Aug 22, 2026Source checked Aug 22, 2026First seen by HOL Aug 22, 2026Material review Aug 22, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=5161b31dc39a6d6dadc95f298de48a725b73ada8 <29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed \|\| >=5161b31dc39a6d6dadc95f298de48a725b73ada8 <b7949b0a7d998013b7ec8617a0ef5b07cca80be4 \|\| >=5161b31dc39a6d6dadc95f298de48a725b73ada8 <8444d66aa6b6e7fe0a26fa1a00a11cb4d0523783	29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed, b7949b0a7d998013b7ec8617a0ef5b07cca80be4, 8444d66aa6b6e7fe0a26fa1a00a11cb4d0523783
Linux/Linuxgeneric	3.14	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 22, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.