CVE-2026-99204: Linux kernel · ocfs2/dlm: Protect the recovery list during debugfs reads
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 03:51 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 28 Oct 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 29 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther 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 fix is available that properly protects the recovery participant list traversal during debugfs reads by using the dlm_reco_state_lock. Users should apply the updated Linux kernel versions that include this patch. No additional mitigation is required beyond applying the official fix.
Description
A use-after-free vulnerability was identified and fixed in the Linux kernel's OCFS2 Distributed Lock Manager (DLM) module. The issue involved improper locking during debugfs reads of the recovery participant list, which could lead to reading freed memory. The fix ensures that the recovery list traversal and field reads in debug_state_print() are properly protected by the dlm_reco_state_lock, preventing concurrent access issues.
References
- ubuntu.com/security/CVE-2026-99204 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99204 (opens in a new tab)
- git.kernel.org/stable/c/2bc426a32bfb78868c7f76d9547132837b6b5284 (opens in a new tab)
- git.kernel.org/stable/c/4c435828932bf46f29860e4a0375bcae101b778a (opens in a new tab)
- git.kernel.org/stable/c/04d4571c00db61a9664f387752fa05cb3c08a537 (opens in a new tab)