# SUNRPC: svcauth_gss: enforce krb5 token minimum length

CVE record · `CVE-2026-89550`

- **Identifiers:** `CVE-2026-89550`
- **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:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:44 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: `7c9fdcfb1b64c47ed618c103b617af3f86e1239c to before 2188232509f1559cb8fcb0c9a4b1e04317fa0f15` (git)
  - affected: `7c9fdcfb1b64c47ed618c103b617af3f86e1239c to before 0ea5b0c7f212c2772d32c2b88287b89a9cdf6edd` (git)
  - affected: `7c9fdcfb1b64c47ed618c103b617af3f86e1239c to before dd6afc6cab8c5d387d1ed2f069562ef7bdadd651` (git)
  - affected: `7c9fdcfb1b64c47ed618c103b617af3f86e1239c to before de942dd8c2c8358bcad04ce44271954c48924423` (git)
  - affected: `7c9fdcfb1b64c47ed618c103b617af3f86e1239c to before 2eed1e6a976a44015c3ee78841fe336796e2b21c` (git)
  - affected: `7c9fdcfb1b64c47ed618c103b617af3f86e1239c to before a919c5c88769cf8fb3ec071e6078d830bf512489` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.18`
  - unaffected: `before 2.6.18` (semver)
  - unaffected: `6.1.191 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:** 0.0049, the 42nd 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-2026-89550](https://www.cve.org/CVERecord?id=CVE-2026-89550)
- [NVD: CVE-2026-89550](https://nvd.nist.gov/vuln/detail/CVE-2026-89550)

### References from the CNA

- <https://git.kernel.org/stable/c/2188232509f1559cb8fcb0c9a4b1e04317fa0f15>
- <https://git.kernel.org/stable/c/0ea5b0c7f212c2772d32c2b88287b89a9cdf6edd>
- <https://git.kernel.org/stable/c/dd6afc6cab8c5d387d1ed2f069562ef7bdadd651>
- <https://git.kernel.org/stable/c/de942dd8c2c8358bcad04ce44271954c48924423>
- <https://git.kernel.org/stable/c/2eed1e6a976a44015c3ee78841fe336796e2b21c>
- <https://git.kernel.org/stable/c/a919c5c88769cf8fb3ec071e6078d830bf512489>

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-2026-89550>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89550/>. Everything for agents: <https://agentprime.io/llms.txt>.