# nfsd: check nfsd4_acl_to_attr() return value in nfsd4_create()

CVE record · `CVE-2026-89693`

- **Identifiers:** `CVE-2026-89693`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `c5409ce523af40d5c3019717bc5b4f72038d48be to before 154acf97ecd2c0bb00f6533f86d4bd2b934475d5` (git)
  - affected: `d52acd23a327cada5fb597591267cfc09f08bb1d to before 73dfa989f6f0dedcae1f2650aab3401537044282` (git)
  - affected: `c0cbe70742f4a70893cd6e5f6b10b6e89b6db95b to before 04b913ab96c2a874f41b5e5a19ac7120526723c2` (git)
  - affected: `c0cbe70742f4a70893cd6e5f6b10b6e89b6db95b to before 2d8a8ed4f9d8637ef0f18d47d19193e7b780e90e` (git)
  - affected: `c0cbe70742f4a70893cd6e5f6b10b6e89b6db95b to before 26877d3a09afb3838a053867a655ca30c46a1f81` (git)
  - affected: `c0cbe70742f4a70893cd6e5f6b10b6e89b6db95b to before 430ed49a16cf9ca249d0fb51490582090bc4848b` (git)
  - affected: `c0cbe70742f4a70893cd6e5f6b10b6e89b6db95b to before 80cebb0e8a8d1e758f0d671f5e047279c5c3e528` (git)
  - affected: `c0cbe70742f4a70893cd6e5f6b10b6e89b6db95b to before 2c7912732184773dbd371a411da87af1cc080b86` (git)
  - affected: `5.10.220 to before 5.10.273` (semver)
  - affected: `5.15.154 to before 5.15.224` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.0`
  - unaffected: `before 6.0` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The Linux kernel NFS server (nfsd) is affected, including version 6.0 and kernel trees before the fixes listed for each branch. When a client creates a file with an ACL, an ACL translation error is ignored and the file is created without the requested ACL. The source gives few details about what an attacker needs. Upgrade to 5.10.273, 5.15.224, 6.1.191, 6.6.160, or a later release in those series.

Written 12 Nov 2026.

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89693](https://www.cve.org/CVERecord?id=CVE-2026-89693)
- [NVD: CVE-2026-89693](https://nvd.nist.gov/vuln/detail/CVE-2026-89693)

### References from the CNA

- <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>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-89693>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89693/>. Everything for agents: <https://agentprime.io/llms.txt>.