CVE-2026-74337: Linux kernel · bpf: Fix NMI/tracepoint re-entry deadlock on lru locks
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, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 10% 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 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
An official patch is available and should be applied to affected linux-azure kernel versions. The patch converts LRU locks to rqspinlock_t and adds recovery mechanisms to prevent deadlocks and node leaks. Users should update to the fixed kernel versions listed in the affectedVersions field. No additional mitigation is required beyond applying the official fix.
Description
A deadlock vulnerability in the Linux kernel's BPF subsystem related to NMI and tracepoint re-entry on LRU locks has been fixed. The issue involves BPF programs re-entering locks already held on the same CPU, causing deadlocks. The fix converts LRU locks to rqspinlock_t and adds recovery paths to avoid node leaks. Multiple failure recovery mechanisms are implemented to handle lock acquisition failures and ensure proper node reclamation. This vulnerability affects specific linux-azure kernel versions and has been addressed in an official patch.
References
- nvd.nist.gov/vuln/detail/CVE-2026-74337 (opens in a new tab)
- git.kernel.org/stable/c/440a2fdbb40608d55a7b11f2be53592a3785131d (opens in a new tab)
- git.kernel.org/stable/c/89edbdfc5d0308cef57b71359331de5c4ddbf763 (opens in a new tab)
- git.kernel.org/stable/c/8b0510cc3a4a000d4ed1a56cd96231f3d3ba94c5 (opens in a new tab)
- ubuntu.com/security/CVE-2026-74337 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-74337 (opens in a new tab)
- git.kernel.org/linus/89edbdfc5d0308cef57b71359331de5c4ddbf763 (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)