# net: ipv6: clear suppressed fib6 rule result

CVE record · `CVE-2026-74581`

- **Identifiers:** `CVE-2026-74581`
- **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:** 21 Aug 2026
- **Updated:** 16 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 21 Aug 2026, 16:31 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: `209d35ee34e25f9668c404350a1c86d914c54ffa to before 90c57310e266eb94e4a80d6b15a9ca131d2e82cb` (git)
  - affected: `8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383 to before 5d29b286c9de0b309e94b9ed083aa1a2f429434f` (git)
  - affected: `cdef485217d30382f3bf6448c54b4401648fe3f1 to before 354db6243eca59e9d187ffbf8b7955b044ce84dc` (git)
  - affected: `cdef485217d30382f3bf6448c54b4401648fe3f1 to before 6d98c70fe0ba8c7708bfd5b2a5174d2086775daa` (git)
  - affected: `cdef485217d30382f3bf6448c54b4401648fe3f1 to before 9bad152c42b37499162367fe47867411e62fffa3` (git)
  - affected: `cdef485217d30382f3bf6448c54b4401648fe3f1 to before dc3ab04220667f254f4348572b2a0b3febff89fb` (git)
  - affected: `cdef485217d30382f3bf6448c54b4401648fe3f1 to before a341c091ca0bfae377747b1b59a3bd8ebe18a937` (git)
  - affected: `cdef485217d30382f3bf6448c54b4401648fe3f1 to before 6aea62e433fe1b586202a5fee8b5807ce635e1d7` (git)
  - affected: `ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29` (git)
  - affected: `5.10.84 to before 5.10.265` (semver)
  - affected: `5.15.7 to before 5.15.216` (semver)
  - affected: `5.4.164 to before 5.5` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.16`
  - unaffected: `before 5.16` (semver)
  - unaffected: `5.10.265 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.216 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.183 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.151 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.103 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.44 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.8 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 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:** 0.0042, the 36th percentile, on 15 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 21 Aug 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-74581](https://www.cve.org/CVERecord?id=CVE-2026-74581)
- [NVD: CVE-2026-74581](https://nvd.nist.gov/vuln/detail/CVE-2026-74581)

### References from the CNA

- <https://git.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cb>
- <https://git.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434f>
- <https://git.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dc>
- <https://git.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daa>
- <https://git.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3>
- <https://git.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb>
- <https://git.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937>
- <https://git.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7>

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-2026-74581>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-74581/>. Everything for agents: <https://agentprime.io/llms.txt>.