CVE-2026-74687 json
watchdog: at91sam9_wdt: prevent timer rearm during teardown
published 2026-08-22 2 mo ago modified 2026-10-30 10 d ago also EUVD-2026-64374
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 2%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Linux Linux 6.1.191, 6.6.160, 6.12.114, 6.18.45, 7.1.9, 7.2
- linux Debian 13 6.12.115-2
- linux Debian 14 7.1.9-1
debian advisories DEBIAN-CVE-2026-74687
- linux Ubuntu 26.04 LTS 7.0.0-42.42
- linux-aws Ubuntu 26.04 LTS 7.0.0-1016.17
- linux-gcp Ubuntu 26.04 LTS 7.0.0-1016.18
- linux-ibm Ubuntu 26.04 LTS 7.0.0-1017.17
- linux-riscv Ubuntu 26.04 LTS 7.0.0-42.42.1
- linux-oracle Ubuntu 26.04 LTS 7.0.0-1015.16
- linux-hwe-7.0 Ubuntu 24.04 LTS 7.0.0-42.42~24.04.1
- linux-oem-7.0 Ubuntu 26.04 LTS 7.0.0-1017.17
ubuntu advisories UBUNTU-CVE-2026-74687
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- git.kernel.org/stable/c/f96c18a766477e5f33d51697963a5c8aed260dae commit
- git.kernel.org/stable/c/a9e0efcb1125e6b452c648671f15920c4955b681 commit
- git.kernel.org/stable/c/1beb4dd6a30dea699e98990dd61f892ed1c0985e commit
- git.kernel.org/stable/c/29fe74c9aa69d78c1c6a3930f1d9fc5db71a6eed commit
- git.kernel.org/stable/c/b7949b0a7d998013b7ec8617a0ef5b07cca80be4 commit
- git.kernel.org/stable/c/8444d66aa6b6e7fe0a26fa1a00a11cb4d0523783 commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-74687 updated cvss 5.5
kernel: watchdog: at91sam9_wdt: prevent timer rearm during teardown
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernelnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Linux Linux
Classification
- Technology feeds
References
- git.kernel.org /stable/c/f96c18a766477e5f33d51697963a5c8aed260dae
- 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
Sources
- CVE List CVE-2026-74687
- NVD CVE-2026-74687
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.