# fuse: fix invalidate lock leak on setattr writeback failure

CVE record · `CVE-2026-80856`

- **Identifiers:** `CVE-2026-80856`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 4 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 4 Sept 2026, 15:55 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: `6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to before 92faaee1b108c6e4b07730d20896a6593a85f675` (git)
  - affected: `6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to before 8f14906ce9103ab8f2f1ebda45935a0d61b9d763` (git)
  - affected: `6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to before 03cfeeb135428fa83f0791d3f8f94d9298cae695` (git)
  - affected: `6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to before 92588d187ba4697a322e7aefe5d9e538a87d1cd2` (git)
  - affected: `6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to before ea9fea370b8de4ffd72e0ef89550415c15637787` (git)
  - affected: `6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to before 1758730d9eaa3c06cf415c3446d9f6eed9ed3eed` (git)
  - affected: `6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to before dd278d954c0e96a9cbd3cc491e07b8267d25f8d5` (git)
  - affected: `6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to before e8457ebfd77a46e8d1210e8888ea914ad064558e` (git)
  - affected: `6ae330cad6ef22ab8347ea9e0707dc56a7c7363f to before 9afeca0d569c9fc89d758fe7a9339d1e8afb1546` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.10`
  - unaffected: `before 5.10` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.220 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.187 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.156 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.108 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.49 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.13 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2.3 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 FUSE code, in versions from 5.10 up to the fixed releases, can leak a filemap invalidate lock when a setattr writeback fails on a DAX file, such as a truncate of a setuid file whose flush returns an error. Later faults or truncates on that file then stall indefinitely, which causes a denial of service. The source does not describe other attacker requirements. Upgrade to 5.10.273, 5.15.220, 6.1.187, 6.6.156, or a later release in those 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:** 0.0018, the 7th percentile, on 14 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 4 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-80856](https://www.cve.org/CVERecord?id=CVE-2026-80856)
- [NVD: CVE-2026-80856](https://nvd.nist.gov/vuln/detail/CVE-2026-80856)

### References from the CNA

- <https://git.kernel.org/stable/c/92faaee1b108c6e4b07730d20896a6593a85f675>
- <https://git.kernel.org/stable/c/8f14906ce9103ab8f2f1ebda45935a0d61b9d763>
- <https://git.kernel.org/stable/c/03cfeeb135428fa83f0791d3f8f94d9298cae695>
- <https://git.kernel.org/stable/c/92588d187ba4697a322e7aefe5d9e538a87d1cd2>
- <https://git.kernel.org/stable/c/ea9fea370b8de4ffd72e0ef89550415c15637787>
- <https://git.kernel.org/stable/c/1758730d9eaa3c06cf415c3446d9f6eed9ed3eed>
- <https://git.kernel.org/stable/c/dd278d954c0e96a9cbd3cc491e07b8267d25f8d5>
- <https://git.kernel.org/stable/c/e8457ebfd77a46e8d1210e8888ea914ad064558e>
- <https://git.kernel.org/stable/c/9afeca0d569c9fc89d758fe7a9339d1e8afb1546>

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-2026-80856>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80856/>. Everything for agents: <https://agentprime.io/llms.txt>.