# btrfs: zoned: flush active metadata block group at btree_writepages() start

CVE record · `CVE-2026-90261`

- **Identifiers:** `CVE-2026-90261`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:07 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: `13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 to before 58b0ab0340ce04a057169d42cbacbf786063813d` (git)
  - affected: `13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 to before e2de2989adb3e58c2320e57c255f52e065667b5e` (git)
  - affected: `13bb483d32abb6f8ebd40141d87eb68f11cc2dd2 to before ecc05eda9a346848ae01a6c8bfa3f0bec133bd8b` (git)
  - affected: `fca3a1cd3ba47f1815e0c0fcdc9aafaf02ee0a75` (git)
  - affected: `6.5.5 to before 6.6` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.6`
  - unaffected: `before 6.6` (semver)
  - unaffected: `6.18.57 to 6.18.*, inclusive` (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:** 0.0021, the 10th 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 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90261](https://www.cve.org/CVERecord?id=CVE-2026-90261)
- [NVD: CVE-2026-90261](https://nvd.nist.gov/vuln/detail/CVE-2026-90261)

### References from the CNA

- <https://git.kernel.org/stable/c/58b0ab0340ce04a057169d42cbacbf786063813d>
- <https://git.kernel.org/stable/c/e2de2989adb3e58c2320e57c255f52e065667b5e>
- <https://git.kernel.org/stable/c/ecc05eda9a346848ae01a6c8bfa3f0bec133bd8b>

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-2026-90261>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90261/>. Everything for agents: <https://agentprime.io/llms.txt>.