CVE-2026-74331: Linux kernel · firmware_loader: Fix recursive lock in device_cache_fw_images()
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1117.124~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1117.124~20.04.1, 5.15.0-1123.132~20.04.1, 5.15.0-1122.131~20.04.1 +41
Exploitation evidence
Disclosed: evidence found.
CVE published 15 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 to resolve the recursive locking deadlock. The fix involves changes in the firmware loader to release the lock earlier, preventing recursive locking. Users should update their systems to the patched kernel versions as provided by their Linux distribution vendors.
Description
A recursive locking deadlock vulnerability in the Linux kernel firmware loader was fixed. The issue occurs during system suspend or hibernation preparation when a lock is held recursively due to synchronous execution fallback on memory allocation failure. This can cause a deadlock in the firmware loader's power management notification handler. The fix involves releasing the lock earlier to prevent recursive locking. Several specific Linux kernel versions are affected. A patch is available to resolve this issue.
References
- nvd.nist.gov/vuln/detail/CVE-2026-74331 (opens in a new tab)
- git.kernel.org/stable/c/38149b57427c736c08d9aa4c7b87deacd53e9e63 (opens in a new tab)
- git.kernel.org/stable/c/490b0385e4cfac691f7b18dde821c13e77b4770b (opens in a new tab)
- git.kernel.org/stable/c/7865a1bfd20d10c03b083a5fc392d907ca5099b3 (opens in a new tab)
- git.kernel.org/stable/c/806cb8fabfde7f830da5ae87777d52fdf50c4774 (opens in a new tab)
- git.kernel.org/stable/c/a5b2a68a391b05d54552f13548a72a46c65006f7 (opens in a new tab)
- git.kernel.org/stable/c/c0f2dedd41fe14dbe076c1672214802fb42cd8c8 (opens in a new tab)
- git.kernel.org/stable/c/d3ec78f8f8d48a04a9fac38d47275c34645e5103 (opens in a new tab)
- git.kernel.org/stable/c/f25d6e4ec4c257030592bd671f113cf9584c52f0 (opens in a new tab)
- ubuntu.com/security/CVE-2026-74331 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-74331 (opens in a new tab)
- git.kernel.org/linus/d3ec78f8f8d48a04a9fac38d47275c34645e5103 (opens in a new tab)
- ubuntu.com/security/notices/USN-8876-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8878-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8879-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8877-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8875-1 (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)