# net: ipv6: Fix UDP length overflow with PMTU discover and big MTU

CVE record · `CVE-2026-97984`

- **Identifiers:** `CVE-2026-97984`
- **State:** Confirmed
- **Severity:** No CVSS score
- **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: `427faee167bce4ccb0b22f6815a9ac509e31d4c3 to before 1dd562f3019019ffdf4b396570613053facda9ee` (git)
  - affected: `427faee167bce4ccb0b22f6815a9ac509e31d4c3 to before 1d56a00ec91f2885c64ea5b8cea18cb746b91bbb` (git)
  - affected: `427faee167bce4ccb0b22f6815a9ac509e31d4c3 to before ce66352d3eb21825410af8b91db7cc4bb8e22c98` (git)
  - affected: `427faee167bce4ccb0b22f6815a9ac509e31d4c3 to before e01b7c176d9af2b7c22bb3fe12cf9a7904f99fdc` (git)
  - affected: `427faee167bce4ccb0b22f6815a9ac509e31d4c3 to before 0ae10b6be49b425827659b23bcce498f80eb7182` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.15`
  - unaffected: `before 5.15` (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

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0017, the 6th percentile, on 12 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-2026-97984](https://www.cve.org/CVERecord?id=CVE-2026-97984)
- [NVD: CVE-2026-97984](https://nvd.nist.gov/vuln/detail/CVE-2026-97984)

### References from the CNA

- <https://git.kernel.org/stable/c/1dd562f3019019ffdf4b396570613053facda9ee>
- <https://git.kernel.org/stable/c/1d56a00ec91f2885c64ea5b8cea18cb746b91bbb>
- <https://git.kernel.org/stable/c/ce66352d3eb21825410af8b91db7cc4bb8e22c98>
- <https://git.kernel.org/stable/c/e01b7c176d9af2b7c22bb3fe12cf9a7904f99fdc>
- <https://git.kernel.org/stable/c/0ae10b6be49b425827659b23bcce498f80eb7182>

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-2026-97984>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-97984/>. Everything for agents: <https://agentprime.io/llms.txt>.