# btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()

CVE record · `CVE-2026-93800`

- **Identifiers:** `CVE-2026-93800`
- **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:** 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: `f32b84d7c977e1906a4781b93b3c93090b6cd675 to before 5a247097c5f94b51ffc991b444d998ad6e85875f` (git)
  - affected: `592fbcd50c99b8adf999a2a54f9245caff333139 to before 6372dd394ea907cd85a7a8063db320ec73dfaed0` (git)
  - affected: `592fbcd50c99b8adf999a2a54f9245caff333139 to before 9f599d120b2b79d2d937c3935b7cdf2697514283` (git)
  - affected: `592fbcd50c99b8adf999a2a54f9245caff333139 to before a01837ae174a2a968c245a30e6dd010f50eaf05d` (git)
  - affected: `592fbcd50c99b8adf999a2a54f9245caff333139 to before 97a540d72ebcb21853d11f2a56782fe377f358e7` (git)
  - affected: `592fbcd50c99b8adf999a2a54f9245caff333139 to before fda1b6636ff1846f00643e791099db5564b547d9` (git)
  - affected: `592fbcd50c99b8adf999a2a54f9245caff333139 to before 83201804efa4a5168be754e1dfc9b2faee760cac` (git)
  - affected: `aa18bc1ff8a51f082d5b3b6d07693797637b4028` (git)
  - affected: `4cb0aea2e250eee35ccfac5f5395cd8f3238a9e5` (git)
  - affected: `5.10.36 to before 5.10.271` (semver)
  - affected: `5.11.20 to before 5.12` (semver)
  - affected: `5.12.3 to before 5.13` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.13`
  - unaffected: `before 5.13` (semver)
  - unaffected: `5.10.271 to 5.10.*, inclusive` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0017, the 6th 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-2026-93800](https://www.cve.org/CVERecord?id=CVE-2026-93800)
- [NVD: CVE-2026-93800](https://nvd.nist.gov/vuln/detail/CVE-2026-93800)

### References from the CNA

- <https://git.kernel.org/stable/c/5a247097c5f94b51ffc991b444d998ad6e85875f>
- <https://git.kernel.org/stable/c/6372dd394ea907cd85a7a8063db320ec73dfaed0>
- <https://git.kernel.org/stable/c/9f599d120b2b79d2d937c3935b7cdf2697514283>
- <https://git.kernel.org/stable/c/a01837ae174a2a968c245a30e6dd010f50eaf05d>
- <https://git.kernel.org/stable/c/97a540d72ebcb21853d11f2a56782fe377f358e7>
- <https://git.kernel.org/stable/c/fda1b6636ff1846f00643e791099db5564b547d9>
- <https://git.kernel.org/stable/c/83201804efa4a5168be754e1dfc9b2faee760cac>

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-2026-93800>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-93800/>. Everything for agents: <https://agentprime.io/llms.txt>.