# audit: avoid dropping live tree ref on fsnotify rule autoremove

CVE record · `CVE-2026-89643`

- **Identifiers:** `CVE-2026-89643`
- **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:** 11 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:45 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: `34d99af52ad40bd498ba66970579a5bc1fb1a3bc to before 9cac21f8eb82675ed19fb955b8bbb9dd14cc3d58` (git)
  - affected: `34d99af52ad40bd498ba66970579a5bc1fb1a3bc to before b322cc7adcd2e6ec1594d187533a126506ab545c` (git)
  - affected: `34d99af52ad40bd498ba66970579a5bc1fb1a3bc to before 695c85dc345a4e0292739f004c261bedef3f27e6` (git)
  - affected: `34d99af52ad40bd498ba66970579a5bc1fb1a3bc to before 01b0ec8c397be65ff710777c97017ca1de56ef8e` (git)
  - affected: `34d99af52ad40bd498ba66970579a5bc1fb1a3bc to before cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28` (git)
  - affected: `34d99af52ad40bd498ba66970579a5bc1fb1a3bc to before 636a99bab36ba27515363d325866c0273ac83b3e` (git)
  - affected: `34d99af52ad40bd498ba66970579a5bc1fb1a3bc to before 583cf579b32d99e3fe4e9c8ecc4d852e3708fbec` (git)
  - affected: `34d99af52ad40bd498ba66970579a5bc1fb1a3bc to before 783f0f0974c156aca630f4ffff248671082a098d` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.3`
  - unaffected: `before 4.3` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 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

- 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:** 0.0071, the 54th 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 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89643](https://www.cve.org/CVERecord?id=CVE-2026-89643)
- [NVD: CVE-2026-89643](https://nvd.nist.gov/vuln/detail/CVE-2026-89643)

### References from the CNA

- <https://git.kernel.org/stable/c/9cac21f8eb82675ed19fb955b8bbb9dd14cc3d58>
- <https://git.kernel.org/stable/c/b322cc7adcd2e6ec1594d187533a126506ab545c>
- <https://git.kernel.org/stable/c/695c85dc345a4e0292739f004c261bedef3f27e6>
- <https://git.kernel.org/stable/c/01b0ec8c397be65ff710777c97017ca1de56ef8e>
- <https://git.kernel.org/stable/c/cf37b61b5420fd4600fe78cf8c24da6e4d9bfe28>
- <https://git.kernel.org/stable/c/636a99bab36ba27515363d325866c0273ac83b3e>
- <https://git.kernel.org/stable/c/583cf579b32d99e3fe4e9c8ecc4d852e3708fbec>
- <https://git.kernel.org/stable/c/783f0f0974c156aca630f4ffff248671082a098d>

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-2026-89643>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89643/>. Everything for agents: <https://agentprime.io/llms.txt>.