CVE-2026-93212: Linux kernel · nfsd: guard nfsd_serv deref in nfsd_file_net_dispose
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 15:59 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 24 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 adds a guard to prevent dereferencing a NULL nn->nfsd_serv pointer in nfsd_file_net_dispose(). Users should apply the updated Linux kernel versions that include this patch. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's nfsd_file_net_dispose() function could lead to a NULL pointer dereference during per-network teardown. The issue arises because the nfsd service thread loop calls svc_wake_up() on a potentially NULL pointer nn->nfsd_serv, which is cleared before the filecache shutdown completes. This flaw has been fixed by adding a guard to ensure svc_wake_up() is only called when the pointer is non-NULL.
References
- ubuntu.com/security/CVE-2026-93212 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93212 (opens in a new tab)
- git.kernel.org/stable/c/59baf45a06435194005fc5fa9a42d89f77a30432 (opens in a new tab)
- git.kernel.org/stable/c/f4776c1c4b38fbc459420321c8ece87d0f7f95fb (opens in a new tab)
- git.kernel.org/stable/c/766170b4fd2daaf5c4d6735560101474e18edab6 (opens in a new tab)
- git.kernel.org/stable/c/9f1ddfc8cb9076592401a611eb3a44d36186d014 (opens in a new tab)