CVE-2026-89484: Linux kernel · lockd: fix NULL dereference on lockowner allocation failure
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 12:55 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.
Exploitation evidence
Disclosed: evidence found.
CVE published 11 Sep 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
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 fix for this vulnerability has been implemented in the Linux kernel. Users should apply the official kernel updates that address this issue. Since this is not a cloud service, remediation requires updating the affected Linux kernel versions.
Description
A vulnerability in the Linux kernel's lockd component causes a NULL pointer dereference when lockowner allocation fails. This occurs because NLM file lock operations are installed even if the lockowner allocation fails, leading to a crash during cleanup. The issue has been fixed by ensuring lock operations are only installed after successful lockowner allocation.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89484 (opens in a new tab)
- git.kernel.org/stable/c/07adfbb3de7529f58ca708a97ead7fa4fdb71056 (opens in a new tab)
- git.kernel.org/stable/c/4c7fc129db061c7daab841c4f3c342d894832362 (opens in a new tab)
- git.kernel.org/stable/c/51af080ca4e553256c59a75a877b9b4fff828311 (opens in a new tab)
- git.kernel.org/stable/c/d662f7fc04fde305a27f304b3cd19b614d366839 (opens in a new tab)
- ubuntu.com/security/CVE-2026-89484 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89484 (opens in a new tab)
- git.kernel.org/linus/4c7fc129db061c7daab841c4f3c342d894832362 (opens in a new tab)