CVE-2026-89673: Linux kernel · nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo
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 11% 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 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSlinux-aws-6.14pkg:deb/ubuntu/linux-aws-6.14?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSlinux-aws-6.17pkg:deb/ubuntu/linux-aws-6.17?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=nobleOther 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 corrects the XDR padding calculation by using xdr_align_size() to match the actual encoded data length. Users should apply the official patches or update to fixed Linux kernel versions to remediate this vulnerability.
Description
A vulnerability in the Linux kernel's NFS daemon (nfsd) related to incorrect XDR padding calculation in the function nfsd4_ff_encode_getdeviceinfo has been resolved. The issue causes the declared length of a data field to exceed the actual encoded data by 2-8 bytes, leading to leakage of stale reply-page content to clients and misalignment in decoding subsequent data. This affects multiple specific Linux kernel versions. The severity is medium.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89673 (opens in a new tab)
- git.kernel.org/stable/c/41ebca28e17f84293650598f86bd69532ec1a8e0 (opens in a new tab)
- git.kernel.org/stable/c/62e5949f0dd5ec837af144860ff908369df4c7c9 (opens in a new tab)
- git.kernel.org/stable/c/74015b7be806ad9e21d46f7bd2831df280c6c783 (opens in a new tab)
- git.kernel.org/stable/c/8b989aaec85e1293a871d602590c951fe44b8647 (opens in a new tab)
- ubuntu.com/security/CVE-2026-89673 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89673 (opens in a new tab)
- git.kernel.org/linus/ (opens in a new tab)