# btrfs: lzo: reject inline extents without valid headers

CVE record · `CVE-2026-74723`

- **Identifiers:** `CVE-2026-74723`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 22 Aug 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 22 Aug 2026, 15:33 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.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `a6fa6fae40ec336c7df6155255ae64ebef43a8bc to before 0b824d657d2403e8dbe4257d62825e66f79dcf8c` (git)
  - affected: `a6fa6fae40ec336c7df6155255ae64ebef43a8bc to before 5d00c9c1c951ae82d498eabbdfff973252a05c50` (git)
  - affected: `a6fa6fae40ec336c7df6155255ae64ebef43a8bc to before fd150d7c8e0ad9d721c011cfd4cc0f3c65bd6834` (git)
  - affected: `a6fa6fae40ec336c7df6155255ae64ebef43a8bc to before 056876c9db1e969bfcf7d8583c7696cc0dd080df` (git)
  - affected: `a6fa6fae40ec336c7df6155255ae64ebef43a8bc to before fc50b475ad27f50b4dcc98fc4c44e8802bc1b248` (git)
  - affected: `a6fa6fae40ec336c7df6155255ae64ebef43a8bc to before 0fa78ef637deb5dbe341582f88553a4bce496de0` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.38`
  - unaffected: `before 2.6.38` (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: `7.1.9 to 7.1.*, 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

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0049, the 42nd percentile, on 15 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 22 Aug 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-74723](https://www.cve.org/CVERecord?id=CVE-2026-74723)
- [NVD: CVE-2026-74723](https://nvd.nist.gov/vuln/detail/CVE-2026-74723)

### References from the CNA

- <https://git.kernel.org/stable/c/0b824d657d2403e8dbe4257d62825e66f79dcf8c>
- <https://git.kernel.org/stable/c/5d00c9c1c951ae82d498eabbdfff973252a05c50>
- <https://git.kernel.org/stable/c/fd150d7c8e0ad9d721c011cfd4cc0f3c65bd6834>
- <https://git.kernel.org/stable/c/056876c9db1e969bfcf7d8583c7696cc0dd080df>
- <https://git.kernel.org/stable/c/fc50b475ad27f50b4dcc98fc4c44e8802bc1b248>
- <https://git.kernel.org/stable/c/0fa78ef637deb5dbe341582f88553a4bce496de0>

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-2026-74723>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-74723/>. Everything for agents: <https://agentprime.io/llms.txt>.