# vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes

CVE record · `CVE-2026-89776`

- **Identifiers:** `CVE-2026-89776`
- **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: `f9c4bb0b245cee35ef66f75bf409c9573d934cf9 to before e12c4663529699f457b2988c1dfedf4d13b3b3be` (git)
  - affected: `f9c4bb0b245cee35ef66f75bf409c9573d934cf9 to before 47bfcc871576eaef6c8edab6749acd4b317306ea` (git)
  - affected: `f9c4bb0b245cee35ef66f75bf409c9573d934cf9 to before a9ec10815199f9879ba080241dc555efb1daf324` (git)
  - affected: `f9c4bb0b245cee35ef66f75bf409c9573d934cf9 to before daebc7064a1b4c12c98e52c4bceede7f2fcd573c` (git)
  - affected: `f9c4bb0b245cee35ef66f75bf409c9573d934cf9 to before ad32e564c62ebf5ba76dd60a22af52c69d54d17b` (git)
  - affected: `f9c4bb0b245cee35ef66f75bf409c9573d934cf9 to before 984f831dda31b3a18f47454cf64989f65402879e` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.18`
  - unaffected: `before 5.18` (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-2026-89776](https://www.cve.org/CVERecord?id=CVE-2026-89776)
- [NVD: CVE-2026-89776](https://nvd.nist.gov/vuln/detail/CVE-2026-89776)

### References from the CNA

- <https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be>
- <https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea>
- <https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324>
- <https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c>
- <https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b>
- <https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e>

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-2026-89776>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89776/>. Everything for agents: <https://agentprime.io/llms.txt>.