# ipv4: icmp: reject RTN_UNREACHABLE input routes in icmp_route_lookup

CVE record · `CVE-2026-98303`

- **Identifiers:** `CVE-2026-98303`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 6 Oct 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 6 Oct 2026, 08:46 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: `8b7817f3a959ed99d7443afc12f78a7e1fcc2063 to before 06083cea4a3b95f5ebc85312f97d7086e6c9e782` (git)
  - affected: `8b7817f3a959ed99d7443afc12f78a7e1fcc2063 to before 83aa83f81a8fec30ff5372dee60b2f0561bcb2ca` (git)
  - affected: `8b7817f3a959ed99d7443afc12f78a7e1fcc2063 to before cac69c50716c712ef0114837c9427da66066124c` (git)
  - affected: `8b7817f3a959ed99d7443afc12f78a7e1fcc2063 to before 1af2d87964d87ba7626d96928d68c09158b5a223` (git)
  - affected: `8b7817f3a959ed99d7443afc12f78a7e1fcc2063 to before fda3000147dc96c75ba162f680bec0a9fecf3037` (git)
  - affected: `8b7817f3a959ed99d7443afc12f78a7e1fcc2063 to before 2998147b59c9df0a51477c7a6b3d1f0ba3127dd4` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.25`
  - unaffected: `before 2.6.25` (semver)
  - unaffected: `6.1.189 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.112 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.54 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.8 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:** 0.0018, the 7th percentile, on 10 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 6 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98303](https://www.cve.org/CVERecord?id=CVE-2026-98303)
- [NVD: CVE-2026-98303](https://nvd.nist.gov/vuln/detail/CVE-2026-98303)

### References from the CNA

- <https://git.kernel.org/stable/c/06083cea4a3b95f5ebc85312f97d7086e6c9e782>
- <https://git.kernel.org/stable/c/83aa83f81a8fec30ff5372dee60b2f0561bcb2ca>
- <https://git.kernel.org/stable/c/cac69c50716c712ef0114837c9427da66066124c>
- <https://git.kernel.org/stable/c/1af2d87964d87ba7626d96928d68c09158b5a223>
- <https://git.kernel.org/stable/c/fda3000147dc96c75ba162f680bec0a9fecf3037>
- <https://git.kernel.org/stable/c/2998147b59c9df0a51477c7a6b3d1f0ba3127dd4>

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-2026-98303>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98303/>. Everything for agents: <https://agentprime.io/llms.txt>.