# btrfs: always wait for ordered extents to avoid OE races

CVE record · `CVE-2026-90264`

- **Identifiers:** `CVE-2026-90264`
- **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:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:08 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: `10b1abc1d0c8ae25c2b9ac465515717c68ffff05 to before fa9f6e1958bb05b8a660d9cf2b6f51dee0077290` (git)
  - affected: `097b159d43407b4ea0e5d14ae58a3bbfa5865a24 to before 043b6fd9706e4335851f317352d2717ad40e6d83` (git)
  - affected: `ccd5c23122b01de646c80485e2fadac82d1aab62 to before de8f5cb3cb611f96909797b4b017831f5141cbbe` (git)
  - affected: `c3a3d3986719026c85950bfa6f41a251fc46e16f to before 58ce50b1802a446d3b26df1b9c58be1ab8913d0e` (git)
  - affected: `ff66fe6662330226b3f486014c375538d91c44aa to before aaac9b352f7f53f5d2f7e58e612d67d2a2bf7094` (git)
  - affected: `ff66fe6662330226b3f486014c375538d91c44aa to before ec78575dde998c21be7e0cb2503b5620f34b6255` (git)
  - affected: `4b5875cbb85dbf4d11385eb0a7a589c086d76d42` (git)
  - affected: `b8df7f486a4617d3096b8fa27148cfa54b1d6a8d` (git)
  - affected: `6.1.178 to before 6.1.191` (semver)
  - affected: `6.6.145 to before 6.6.160` (semver)
  - affected: `6.12.97 to before 6.12.114` (semver)
  - affected: `6.18.40 to before 6.18.52` (semver)
  - and 2 more
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `7.2`
  - unaffected: `before 7.2` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 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

## Machine-written summary

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

> The Linux kernel btrfs filesystem code is affected in several version ranges, with a fix listed for 7.2 and for the 6.1, 6.6, 6.12 and 6.18 stable series. A race can occur between a direct write that finishes short and a later buffered write to the same range, where an overlapping ordered extent is inserted and triggers a kernel panic. The source does not state what an attacker needs beyond the ability to issue these writes, or what impact beyond a crash is possible. Users should upgrade to a fixed kernel version for their 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:** 0.0021, 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-2026-90264](https://www.cve.org/CVERecord?id=CVE-2026-90264)
- [NVD: CVE-2026-90264](https://nvd.nist.gov/vuln/detail/CVE-2026-90264)

### References from the CNA

- <https://git.kernel.org/stable/c/fa9f6e1958bb05b8a660d9cf2b6f51dee0077290>
- <https://git.kernel.org/stable/c/043b6fd9706e4335851f317352d2717ad40e6d83>
- <https://git.kernel.org/stable/c/de8f5cb3cb611f96909797b4b017831f5141cbbe>
- <https://git.kernel.org/stable/c/58ce50b1802a446d3b26df1b9c58be1ab8913d0e>
- <https://git.kernel.org/stable/c/aaac9b352f7f53f5d2f7e58e612d67d2a2bf7094>
- <https://git.kernel.org/stable/c/ec78575dde998c21be7e0cb2503b5620f34b6255>

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-2026-90264>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90264/>. Everything for agents: <https://agentprime.io/llms.txt>.