# btrfs: check if root is readonly when setting posix acl

CVE record · `CVE-2026-90263`

- **Identifiers:** `CVE-2026-90263`
- **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: `353c2ea735e4b54fb6250861e67b51b1bcb47198 to before f3e6b504a79d8e90bb7aa8a03a42dc2b51dcc4c4` (git)
  - affected: `353c2ea735e4b54fb6250861e67b51b1bcb47198 to before 20b2c2f3316e82a76ae3358c0bd45824f50f3fd5` (git)
  - affected: `353c2ea735e4b54fb6250861e67b51b1bcb47198 to before dc3a6e90a0a6350a6d43fed9f005f54171809580` (git)
  - affected: `353c2ea735e4b54fb6250861e67b51b1bcb47198 to before ce8103676f4d4b13e1f087fcfb34f80774d30be2` (git)
  - affected: `353c2ea735e4b54fb6250861e67b51b1bcb47198 to before d5602f96ff1e266f069b4d0d94f441050e057e06` (git)
  - affected: `353c2ea735e4b54fb6250861e67b51b1bcb47198 to before 01c2f41fc441f75b3f9326443372faceb1cb6638` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.2`
  - unaffected: `before 5.2` (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: `6.18.57 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-2026-90263](https://www.cve.org/CVERecord?id=CVE-2026-90263)
- [NVD: CVE-2026-90263](https://nvd.nist.gov/vuln/detail/CVE-2026-90263)

### References from the CNA

- <https://git.kernel.org/stable/c/f3e6b504a79d8e90bb7aa8a03a42dc2b51dcc4c4>
- <https://git.kernel.org/stable/c/20b2c2f3316e82a76ae3358c0bd45824f50f3fd5>
- <https://git.kernel.org/stable/c/dc3a6e90a0a6350a6d43fed9f005f54171809580>
- <https://git.kernel.org/stable/c/ce8103676f4d4b13e1f087fcfb34f80774d30be2>
- <https://git.kernel.org/stable/c/d5602f96ff1e266f069b4d0d94f441050e057e06>
- <https://git.kernel.org/stable/c/01c2f41fc441f75b3f9326443372faceb1cb6638>

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-2026-90263>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90263/>. Everything for agents: <https://agentprime.io/llms.txt>.