CVE-2026-89698: Linux kernel · nfsd: widen nfsd_genl_rqstp address fields to sockaddr_storage
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 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 widens the address fields to struct sockaddr_storage and zero-initializes relevant variables to prevent memory leakage. Users should apply the updated Linux kernel versions that include this patch. No additional mitigation is required as the vulnerability is resolved in these versions.
Description
A vulnerability in the Linux kernel's NFS daemon (nfsd) was resolved by widening address fields in the nfsd_genl_rqstp structure to use sockaddr_storage instead of sockaddr. This fixes an out-of-bounds read when handling IPv6 client addresses, which could leak kernel memory to unprivileged processes via netlink attributes. The issue affects specific Linux kernel versions used in various Ubuntu releases.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89698 (opens in a new tab)
- git.kernel.org/stable/c/03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5 (opens in a new tab)
- git.kernel.org/stable/c/a99d720ed2a5258564e5e9d5f39f3184a030d354 (opens in a new tab)
- git.kernel.org/stable/c/dcb69ad0dafb4a24b825183bb94055d5be8a10bd (opens in a new tab)
- ubuntu.com/security/CVE-2026-89698 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89698 (opens in a new tab)
- git.kernel.org/linus/a99d720ed2a5258564e5e9d5f39f3184a030d354 (opens in a new tab)