# ipv4: stop PMTU walk when nexthop group shrinks

CVE record · `CVE-2026-99074`

- **Identifiers:** `CVE-2026-99074`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 23 Oct 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 23 Oct 2026, 12:23 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: `fc07a232326a623d0be482e307c08ea7049c2846 to before 82d83eec893d8ae84f280aec44c60d9fdecc62b5` (git)
  - affected: `b1f7bdee5750d6cbb9497140cd6582abc5fdcb9e to before a411df69524f91fe3adb8f9544d33e701fc9732c` (git)
  - affected: `3bed2abab4a682d426624ce9add9d7b6d475d4e4 to before 7fd60d3c9a1e1b11ef5f1643bbae78d91eae2f4a` (git)
  - affected: `7f5005457b3072fe1ddf15bfef869f2a1d98e05e to before c60d17d6dd61adc761ac6f65a008fefbc54cbf87` (git)
  - affected: `7d3f3b4367f315a61fc615e3138f3d320da8c466 to before c6d670ac656badfd0e15355e07a13a6bdf3b69fd` (git)
  - affected: `7d3f3b4367f315a61fc615e3138f3d320da8c466 to before f27483f9975b5065ff67054cc7eb8edac6083488` (git)
  - affected: `7d3f3b4367f315a61fc615e3138f3d320da8c466 to before 6619e01855e65ef35723685a557e3eb106f4ecf5` (git)
  - affected: `5.15.179 to before 5.15.224` (semver)
  - affected: `6.1.129 to before 6.1.191` (semver)
  - affected: `6.6.79 to before 6.6.160` (semver)
  - affected: `6.12.16 to before 6.12.113` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.13`
  - unaffected: `before 6.13` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.113 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.57 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.11 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:** 0.0015, the 4th percentile, on 6 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 23 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-99074](https://www.cve.org/CVERecord?id=CVE-2026-99074)
- [NVD: CVE-2026-99074](https://nvd.nist.gov/vuln/detail/CVE-2026-99074)

### References from the CNA

- <https://git.kernel.org/stable/c/82d83eec893d8ae84f280aec44c60d9fdecc62b5>
- <https://git.kernel.org/stable/c/a411df69524f91fe3adb8f9544d33e701fc9732c>
- <https://git.kernel.org/stable/c/7fd60d3c9a1e1b11ef5f1643bbae78d91eae2f4a>
- <https://git.kernel.org/stable/c/c60d17d6dd61adc761ac6f65a008fefbc54cbf87>
- <https://git.kernel.org/stable/c/c6d670ac656badfd0e15355e07a13a6bdf3b69fd>
- <https://git.kernel.org/stable/c/f27483f9975b5065ff67054cc7eb8edac6083488>
- <https://git.kernel.org/stable/c/6619e01855e65ef35723685a557e3eb106f4ecf5>

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-2026-99074>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99074/>. Everything for agents: <https://agentprime.io/llms.txt>.