# btrfs: make sure EXTENT_BUFFER_READING is cleared under refs_lock

CVE record · `CVE-2026-93255`

- **Identifiers:** `CVE-2026-93255`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 24 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 24 Sept 2026, 15:51 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: `f5427cab065641a4553d38bb8c4932b8d456c7a7 to before 8f7285d608ed0db7c9f09f341547db5ce1351090` (git)
  - affected: `83f7e52b7ed1c3e03b79123e20b6f6adf8d886bb to before 2073f3d97b0c5d34fe64812d1237e37bd79c17ec` (git)
  - affected: `83f7e52b7ed1c3e03b79123e20b6f6adf8d886bb to before 690c2accacb1aca91ab8186d15dee56da8723f31` (git)
  - affected: `b0c33c0628c5b0678fcae2e05e7b2764149248f8` (git)
  - affected: `7.1.8 to before 7.2` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `7.2`
  - unaffected: `before 7.2` (semver)
  - unaffected: `7.2.6 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0020, the 9th 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-2026-93255](https://www.cve.org/CVERecord?id=CVE-2026-93255)
- [NVD: CVE-2026-93255](https://nvd.nist.gov/vuln/detail/CVE-2026-93255)

### References from the CNA

- <https://git.kernel.org/stable/c/8f7285d608ed0db7c9f09f341547db5ce1351090>
- <https://git.kernel.org/stable/c/2073f3d97b0c5d34fe64812d1237e37bd79c17ec>
- <https://git.kernel.org/stable/c/690c2accacb1aca91ab8186d15dee56da8723f31>

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-2026-93255>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-93255/>. Everything for agents: <https://agentprime.io/llms.txt>.