CVE-2026-80660: Linux kernel · hwmon: (occ) unregister sysfs devices outside occ lock
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 7.0.0-1014.14~24.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 7.0.0-1014.14~24.04.1, 7.0.0-1017.17~24.04.1, 7.0.0-1016.16~24.04.1 +11
Exploitation evidence
Disclosed: evidence found.
CVE published 28 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A patch is available and should be applied to affected Linux kernel versions. The fix serializes hwmon device registration and removal with a dedicated lock and reorders sysfs device unregistration steps to prevent deadlocks. Users should update to patched kernel versions as provided by their distribution vendors. No additional mitigation actions are required beyond applying the official fix.
Description
A deadlock vulnerability was discovered and resolved in the Linux kernel's hardware monitoring (hwmon) subsystem related to unregistering sysfs devices outside the OCC lock. The issue involves circular locking dependencies between the OCC mutex and sysfs callbacks, which could lead to a deadlock during device unregister operations. The fix serializes hwmon registration and removal with a separate lock and adjusts the order of operations to prevent the circular lock dependency. This vulnerability affects specific Linux kernel versions and has a low severity rating.
References
- nvd.nist.gov/vuln/detail/CVE-2026-80660 (opens in a new tab)
- git.kernel.org/stable/c/2092952f22a7da98e76e84139ae202b1fc7ba899 (opens in a new tab)
- git.kernel.org/stable/c/2a4c80ff3571498ec6a916273304b6650026b1b0 (opens in a new tab)
- git.kernel.org/stable/c/7ee43ec8e6774774abbe9dc3027225e01bc964a5 (opens in a new tab)
- git.kernel.org/stable/c/e31408734332b8cc611342cdaaab6ba492180156 (opens in a new tab)
- git.kernel.org/stable/c/e7fd81e9fb1fe476d2131fec66c1138457810ed4 (opens in a new tab)
- git.kernel.org/stable/c/f0aad157576da199c146c1bb266442befa7912ca (opens in a new tab)
- ubuntu.com/security/CVE-2026-80660 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80660 (opens in a new tab)
- git.kernel.org/linus/e31408734332b8cc611342cdaaab6ba492180156 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8889-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-3 (opens in a new tab)