# nfsd: fix posix_acl leak on SETACL decode failure

CVE record · `CVE-2026-53397`

- **Identifiers:** `CVE-2026-53397`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-401](https://cwe.mitre.org/data/definitions/401.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 19 Jul 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 19 Jul 2026, 12:01 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: `a257cdd0e2179630d3201c32ba14d7fcb3c3a055 to before b2eb1ffd511d1b3c3e21122f97cbbccea411e277` (git)
  - affected: `a257cdd0e2179630d3201c32ba14d7fcb3c3a055 to before b94c4be77682aab06d65ca7296149e3bcfb37353` (git)
  - affected: `a257cdd0e2179630d3201c32ba14d7fcb3c3a055 to before 887f92ceccf3eacd5f2402db21254d66372fae00` (git)
  - affected: `a257cdd0e2179630d3201c32ba14d7fcb3c3a055 to before 1e96239fddcefacf6afe6c498357be68eacbcabc` (git)
  - affected: `a257cdd0e2179630d3201c32ba14d7fcb3c3a055 to before bd69a825485168ef74e815ecb286754b570fdcc7` (git)
  - affected: `a257cdd0e2179630d3201c32ba14d7fcb3c3a055 to before 136b416593f1349cf6f72c8e3d18f0f204ee8545` (git)
  - affected: `a257cdd0e2179630d3201c32ba14d7fcb3c3a055 to before a5b42c1e4ff2befaa6b96f7cbf32174751eba083` (git)
  - affected: `a257cdd0e2179630d3201c32ba14d7fcb3c3a055 to before 0853ac544c590880d797b04daa33fcb72b6be0e1` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.13`
  - unaffected: `before 2.6.13` (semver)
  - unaffected: `5.10.260 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.211 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.177 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.144 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.95 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.38 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.3 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## 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

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0053, the 45th percentile, on 15 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 19 Jul 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-53397](https://www.cve.org/CVERecord?id=CVE-2026-53397)
- [NVD: CVE-2026-53397](https://nvd.nist.gov/vuln/detail/CVE-2026-53397)

### References from the CNA

- <https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277>
- <https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353>
- <https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00>
- <https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc>
- <https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7>
- <https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545>
- <https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083>
- <https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1>

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-2026-53397>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-53397/>. Everything for agents: <https://agentprime.io/llms.txt>.