# mpls: reload header after pskb_may_pull()

CVE record · `CVE-2026-89555`

- **Identifiers:** `CVE-2026-89555`
- **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, 19:44 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: `9f427a0e474a67b454420c131709600d44850486 to before aa4fe0b450a461aa1162fe8375f5d28f4c957df8` (git)
  - affected: `9f427a0e474a67b454420c131709600d44850486 to before b1c0783b2facc398437ad8f8b86c636d7a78f8db` (git)
  - affected: `9f427a0e474a67b454420c131709600d44850486 to before bfaaff99238326166694354a63a76c02563f98b1` (git)
  - affected: `9f427a0e474a67b454420c131709600d44850486 to before d9640239827d6d0cb84263b590f7a4f1596c17eb` (git)
  - affected: `9f427a0e474a67b454420c131709600d44850486 to before fed638a248116b8a249bd4202d28e5934bdc65ad` (git)
  - affected: `9f427a0e474a67b454420c131709600d44850486 to before d82b90a38c2ca8a0694428eab0e9551c23f2447d` (git)
  - affected: `9f427a0e474a67b454420c131709600d44850486 to before 49d38c1b4390412f8950d33dfaee0ccbd17beb81` (git)
  - affected: `9f427a0e474a67b454420c131709600d44850486 to before 29e63b8d9fc150cc191b1c6eb7e16e1247e1b650` (git)
  - affected: `ad864d9fce0ec56cc8f6afe5c6a0e6d7f484b9eb` (git)
  - affected: `4.9.8 to before 4.10` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.10`
  - unaffected: `before 4.10` (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:** 0.0069, the 53rd 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-2026-89555](https://www.cve.org/CVERecord?id=CVE-2026-89555)
- [NVD: CVE-2026-89555](https://nvd.nist.gov/vuln/detail/CVE-2026-89555)

### References from the CNA

- <https://git.kernel.org/stable/c/aa4fe0b450a461aa1162fe8375f5d28f4c957df8>
- <https://git.kernel.org/stable/c/b1c0783b2facc398437ad8f8b86c636d7a78f8db>
- <https://git.kernel.org/stable/c/bfaaff99238326166694354a63a76c02563f98b1>
- <https://git.kernel.org/stable/c/d9640239827d6d0cb84263b590f7a4f1596c17eb>
- <https://git.kernel.org/stable/c/fed638a248116b8a249bd4202d28e5934bdc65ad>
- <https://git.kernel.org/stable/c/d82b90a38c2ca8a0694428eab0e9551c23f2447d>
- <https://git.kernel.org/stable/c/49d38c1b4390412f8950d33dfaee0ccbd17beb81>
- <https://git.kernel.org/stable/c/29e63b8d9fc150cc191b1c6eb7e16e1247e1b650>

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-2026-89555>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89555/>. Everything for agents: <https://agentprime.io/llms.txt>.