CVE-2026-89715: Linux kernel · NFS/localio: fix ref leak on nfs_uuid_add_file failure
Affects Linux kernelSource GCVE Database
Not known to be exploited.
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.
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 is available that correctly releases leaked references on the failure path in the NFS localio code. Users should apply the official Linux kernel updates that include this patch to resolve the reference leak. No additional mitigation is required beyond applying the fix.
Description
A reference leak vulnerability in the Linux kernel's NFS localio subsystem was fixed. The issue occurs when nfs_uuid_add_file() races with nfs_uuid_put(), causing a failure path that leaks references to nfsd_file and nfsd_net objects. This leak prevents proper teardown of network namespaces and NFS daemon network structures. The fix ensures all references are correctly released on error paths to avoid resource leaks.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89715 (opens in a new tab)
- git.kernel.org/stable/c/5215e734bf7cba18237155f8cb2a0accb60ca339 (opens in a new tab)
- git.kernel.org/stable/c/9f59b05423ed381f8cdeaaae4bd6778adcb6865c (opens in a new tab)
- git.kernel.org/stable/c/ca018c19e0ba38975e5ddc3ef8117d5b734313aa (opens in a new tab)
- ubuntu.com/security/CVE-2026-89715 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89715 (opens in a new tab)
- git.kernel.org/linus/ca018c19e0ba38975e5ddc3ef8117d5b734313aa (opens in a new tab)