# ext4: check dir entry fits before reading the hash trailer in ext4_search_dir()

CVE record · `CVE-2026-89787`

- **Identifiers:** `CVE-2026-89787`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 08:48 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: `471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 to before 4d20106c536b73c4a8a02652dc85e35898baebf7` (git)
  - affected: `471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 to before 61a395967de06edba58760e81907a272db749faa` (git)
  - affected: `471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 to before e94676a08af6312aa72d8a981232b281f9bcfcf5` (git)
  - affected: `471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 to before d8c184bec24b5a00ae96d704856d935eaded1685` (git)
  - affected: `471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 to before 3933884bc3102898b458c53fbd1ac52eb9cdb8a4` (git)
  - affected: `471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 to before 83663c0b739480c00cfe785675db87520ec484ed` (git)
  - affected: `471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 to before c7e6b863d298f56522d0d08554bbea7f142e6588` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.13`
  - unaffected: `before 5.13` (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: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 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 11th 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89787](https://www.cve.org/CVERecord?id=CVE-2026-89787)
- [NVD: CVE-2026-89787](https://nvd.nist.gov/vuln/detail/CVE-2026-89787)

### References from the CNA

- <https://git.kernel.org/stable/c/4d20106c536b73c4a8a02652dc85e35898baebf7>
- <https://git.kernel.org/stable/c/61a395967de06edba58760e81907a272db749faa>
- <https://git.kernel.org/stable/c/e94676a08af6312aa72d8a981232b281f9bcfcf5>
- <https://git.kernel.org/stable/c/d8c184bec24b5a00ae96d704856d935eaded1685>
- <https://git.kernel.org/stable/c/3933884bc3102898b458c53fbd1ac52eb9cdb8a4>
- <https://git.kernel.org/stable/c/83663c0b739480c00cfe785675db87520ec484ed>
- <https://git.kernel.org/stable/c/c7e6b863d298f56522d0d08554bbea7f142e6588>

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-2026-89787>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89787/>. Everything for agents: <https://agentprime.io/llms.txt>.