# ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet

CVE record · `CVE-2026-89607`

- **Identifiers:** `CVE-2026-89607`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **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.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `237fead619984cc48818fe12ee0ceada3f55b012 to before 2cd21340163494d312836c77c9fbfe2530b3d075` (git)
  - affected: `237fead619984cc48818fe12ee0ceada3f55b012 to before e2152d491ae62d96a32ed59778680a242af1fbc6` (git)
  - affected: `237fead619984cc48818fe12ee0ceada3f55b012 to before d2802414081184f79a619ede178aeef3aa989793` (git)
  - affected: `237fead619984cc48818fe12ee0ceada3f55b012 to before 33e050cac841498b5175f0f385eee903fd98863c` (git)
  - affected: `237fead619984cc48818fe12ee0ceada3f55b012 to before ccd13eff0e7356d2aa28b127b577e4e5ad4563f5` (git)
  - affected: `237fead619984cc48818fe12ee0ceada3f55b012 to before 14cb36a500a5a3afbc955dbf69dabc565f1a3b26` (git)
  - affected: `237fead619984cc48818fe12ee0ceada3f55b012 to before a419c9ebfc9a40ee56aaad6dc68bfd67d400817b` (git)
  - affected: `237fead619984cc48818fe12ee0ceada3f55b012 to before 5babe9c177c364521e3e682b949c5a8c47f4a441` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.19`
  - unaffected: `before 2.6.19` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0017, the 6th 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-2026-89607](https://www.cve.org/CVERecord?id=CVE-2026-89607)
- [NVD: CVE-2026-89607](https://nvd.nist.gov/vuln/detail/CVE-2026-89607)

### References from the CNA

- <https://git.kernel.org/stable/c/2cd21340163494d312836c77c9fbfe2530b3d075>
- <https://git.kernel.org/stable/c/e2152d491ae62d96a32ed59778680a242af1fbc6>
- <https://git.kernel.org/stable/c/d2802414081184f79a619ede178aeef3aa989793>
- <https://git.kernel.org/stable/c/33e050cac841498b5175f0f385eee903fd98863c>
- <https://git.kernel.org/stable/c/ccd13eff0e7356d2aa28b127b577e4e5ad4563f5>
- <https://git.kernel.org/stable/c/14cb36a500a5a3afbc955dbf69dabc565f1a3b26>
- <https://git.kernel.org/stable/c/a419c9ebfc9a40ee56aaad6dc68bfd67d400817b>
- <https://git.kernel.org/stable/c/5babe9c177c364521e3e682b949c5a8c47f4a441>

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-2026-89607>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89607/>. Everything for agents: <https://agentprime.io/llms.txt>.