CVE-2026-89710: Linux kernel · NFSv4.1: fix layout segment leak on the pnfs_layout_process() forget path
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% 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 has been implemented that restores the missing call to pnfs_free_lseg_list() in the pnfs_layout_process() forget path. Users should apply the updated Linux kernel versions that include this fix. Since this is a kernel-level issue, updating to the patched kernel versions is the recommended remediation.
Description
A vulnerability in the Linux kernel's NFSv4.1 implementation caused a layout segment leak in the pnfs_layout_process() function. This issue arises when the server returns a new layout stateid while a valid one is still held, leading to improper freeing of layout segments. The problem is due to a missing call to pnfs_free_lseg_list() in the error handling path, which was removed and not restored in subsequent commits. This leak affects specific Linux kernel versions used in various Ubuntu distributions.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89710 (opens in a new tab)
- git.kernel.org/stable/c/32ac1b0b7f1cfa0d1a1faf9c72f4154046101070 (opens in a new tab)
- git.kernel.org/stable/c/36e3f13bf0728f4ce11ee8904cec82a783222f62 (opens in a new tab)
- git.kernel.org/stable/c/7c5b0e813efd9124760d5fd1bfc6b229f03fb1a2 (opens in a new tab)
- git.kernel.org/stable/c/ee5a386cfe60f3f8286de16a9db8e1a08f0bc124 (opens in a new tab)
- ubuntu.com/security/CVE-2026-89710 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89710 (opens in a new tab)
- git.kernel.org/linus/ee5a386cfe60f3f8286de16a9db8e1a08f0bc124 (opens in a new tab)