# vxlan: reject dynamic fdb entries that reference a nexthop id

CVE record · `CVE-2026-98023`

- **Identifiers:** `CVE-2026-98023`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 25 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 25 Sept 2026, 10:23 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: `1274e1cc42264d4e629841e4f182795cb0becfd2 to before 00c7f4b8144e535ffb931ad45942a1bd1315b882` (git)
  - affected: `1274e1cc42264d4e629841e4f182795cb0becfd2 to before 55a33882808f1402052d53a08ead59aff8af18a1` (git)
  - affected: `1274e1cc42264d4e629841e4f182795cb0becfd2 to before c8f29af91e0830fdabc9aa1eb1a0f898ce1bc603` (git)
  - affected: `1274e1cc42264d4e629841e4f182795cb0becfd2 to before b2a8e165ddb6cd72176890b2954c52b0f6dbce1a` (git)
  - affected: `1274e1cc42264d4e629841e4f182795cb0becfd2 to before 28f86eec851b7406a4bc6143f82aeba2882d9842` (git)
  - affected: `1274e1cc42264d4e629841e4f182795cb0becfd2 to before 53359916ceb649b7e6947c8c2f669368a41c1354` (git)
  - affected: `1274e1cc42264d4e629841e4f182795cb0becfd2 to before 3fa64d86fc64eda104e3e97721a12a42a2fd2073` (git)
  - affected: `1274e1cc42264d4e629841e4f182795cb0becfd2 to before 98fc57d167446b95b4e719815fe79edef93f8e7a` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.8`
  - unaffected: `before 5.8` (semver)
  - unaffected: `5.10.271 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.222 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.189 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.7 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:** 0.0013, the 2nd percentile, on 11 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 25 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98023](https://www.cve.org/CVERecord?id=CVE-2026-98023)
- [NVD: CVE-2026-98023](https://nvd.nist.gov/vuln/detail/CVE-2026-98023)

### References from the CNA

- <https://git.kernel.org/stable/c/00c7f4b8144e535ffb931ad45942a1bd1315b882>
- <https://git.kernel.org/stable/c/55a33882808f1402052d53a08ead59aff8af18a1>
- <https://git.kernel.org/stable/c/c8f29af91e0830fdabc9aa1eb1a0f898ce1bc603>
- <https://git.kernel.org/stable/c/b2a8e165ddb6cd72176890b2954c52b0f6dbce1a>
- <https://git.kernel.org/stable/c/28f86eec851b7406a4bc6143f82aeba2882d9842>
- <https://git.kernel.org/stable/c/53359916ceb649b7e6947c8c2f669368a41c1354>
- <https://git.kernel.org/stable/c/3fa64d86fc64eda104e3e97721a12a42a2fd2073>
- <https://git.kernel.org/stable/c/98fc57d167446b95b4e719815fe79edef93f8e7a>

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-2026-98023>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98023/>. Everything for agents: <https://agentprime.io/llms.txt>.