CVE-2026-92503: Linux kernel · ext4: fix ABBA deadlock in ext4_xattr_inode_cache_find()
Source GCVE Database
Not known to be exploited · fixed in e5e883ffe5230320060ea613a1acf750f3161c95 : patch Linux kernel soon.
Data as of 30 Oct 2026, 18:18 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in e5e883ffe5230320060ea613a1acf750f3161c95, d3b19b318e0e0483180d15f1d9f5e807a1fb59d5, 03438084a7b8621fb5c762dd3d04cff5f2630fb2 +6
Exploitation evidence
Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available that introduces a non-blocking inode lookup flag to prevent the deadlock. Users should apply the official Linux kernel update that includes this patch to resolve the issue. No additional mitigation steps are indicated.
Description
A deadlock vulnerability was identified and fixed in the ext4 filesystem code of the Linux kernel. The issue involved an ABBA deadlock between concurrent extended attribute (xattr) workloads and the eviction thread during inode cache lookups. The fix introduces a non-blocking inode lookup flag to prevent waiting on inodes being evicted or created, thereby breaking the deadlock cycle.
References
- nvd.nist.gov/vuln/detail/CVE-2026-92503 (opens in a new tab)
- git.kernel.org/stable/c/03438084a7b8621fb5c762dd3d04cff5f2630fb2 (opens in a new tab)
- git.kernel.org/stable/c/074d0620401974cbfa9b63684cdfae99c7b2059c (opens in a new tab)
- git.kernel.org/stable/c/29a2a166450a3e89f61a486033b10cf170fde8b0 (opens in a new tab)
- git.kernel.org/stable/c/7720fddd1fe344d14be258a2028f74ebf1569511 (opens in a new tab)
- git.kernel.org/stable/c/d3b19b318e0e0483180d15f1d9f5e807a1fb59d5 (opens in a new tab)
- git.kernel.org/stable/c/e5e883ffe5230320060ea613a1acf750f3161c95 (opens in a new tab)