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VulnerabilityPublished Updated

CVE-2026-89673: Linux kernel · nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo

Affects Linux kernelSource GCVE Database

0
Authoritative record:CVE-2026-89673· Medium

Not known to be exploited.

Data as of 26 Oct 2026, 12:55 UTC

Severity
Medium

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

  1. Disclosed: evidence found.

    CVE published 11 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threatsAffected
  • 7.0.0-1003.3 – 7.0.0-1013.13
8 affected builds
Fixed in–
Ubuntu 24.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=nobleOther threatsAffected
  • 6.5.0-9.9 – 6.8.0-146.146
58 affected builds
Fixed in–
Ubuntu 24.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=nobleOther threatsAffected
  • 6.5.0-1008.8 – 6.8.0-1066.69
54 affected builds
Fixed in–
Ubuntu 24.04 LTSlinux-aws-6.14pkg:deb/ubuntu/linux-aws-6.14?arch=source&distro=nobleOther threatsAffected
  • 6.14.0-1007.7~24.04.1 – 6.14.0-1018.18~24.04.1
11 affected builds
Fixed in–
Ubuntu 24.04 LTSlinux-aws-6.17pkg:deb/ubuntu/linux-aws-6.17?arch=source&distro=nobleOther threatsAffected
  • 6.17.0-1005.5~24.04.2 – 6.17.0-1020.20~24.04.1
10 affected builds
Fixed in–
Ubuntu 24.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=nobleOther threatsAffected
  • 6.5.0-1007.7 – 6.8.0-1070.78
45 affected builds
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

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