# btrfs: tree-checker: validate INODE_REF's namelen

CVE record · `CVE-2026-93813`

- **Identifiers:** `CVE-2026-93813`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 24 Sept 2026
- **Updated:** 3 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 24 Sept 2026, 16:02 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: `2ede0daf01549cecf4bb0962c46dc47382047523 to before 60078a3e25c09d9d8fba828b0d81bb33e449a1b2` (git)
  - affected: `2ede0daf01549cecf4bb0962c46dc47382047523 to before 509d6a4d889e425f305461d8323a7b39ca6c121c` (git)
  - affected: `2ede0daf01549cecf4bb0962c46dc47382047523 to before 4cb41f07685f88ec724a375883bb0c731db8f6eb` (git)
  - affected: `2ede0daf01549cecf4bb0962c46dc47382047523 to before eeddee090b834a7d4b6a8214d2e3739e64c7a338` (git)
  - affected: `2ede0daf01549cecf4bb0962c46dc47382047523 to before 8f75c19892263bc0555fba922aefe103e841e86d` (git)
  - affected: `2ede0daf01549cecf4bb0962c46dc47382047523 to before 3dc22abc21f5892406c09202fa2627196cc96967` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.37`
  - unaffected: `before 2.6.37` (semver)
  - unaffected: `5.15.222 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.189 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 to 6.18.*, 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0013, the 2nd percentile, on 13 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 24 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-93813](https://www.cve.org/CVERecord?id=CVE-2026-93813)
- [NVD: CVE-2026-93813](https://nvd.nist.gov/vuln/detail/CVE-2026-93813)

### References from the CNA

- <https://git.kernel.org/stable/c/60078a3e25c09d9d8fba828b0d81bb33e449a1b2>
- <https://git.kernel.org/stable/c/509d6a4d889e425f305461d8323a7b39ca6c121c>
- <https://git.kernel.org/stable/c/4cb41f07685f88ec724a375883bb0c731db8f6eb>
- <https://git.kernel.org/stable/c/eeddee090b834a7d4b6a8214d2e3739e64c7a338>
- <https://git.kernel.org/stable/c/8f75c19892263bc0555fba922aefe103e841e86d>
- <https://git.kernel.org/stable/c/3dc22abc21f5892406c09202fa2627196cc96967>

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-2026-93813>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-93813/>. Everything for agents: <https://agentprime.io/llms.txt>.