# sctp: discard the rest of the packet on a stale-cookie error

CVE record · `CVE-2026-98548`

- **Identifiers:** `CVE-2026-98548`
- **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:** 18 Oct 2026
- **Updated:** 24 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 18 Oct 2026, 15:18 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: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c0af3fd150fdc43821df3bb77e5ec74faf4dfc7a` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 854c053c71459f8db7ef07db9cfa4eec5f5206f2` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 965e21ea16acb394d5e5801998ca9b0adc669665` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 1cd246b214dc9acf4e2f11d58c035e1e672fe7d2` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before d68c9287b3ca0d6faadc61fbcb18d1a6b5493321` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ec23855274a73906b02f0d124fefd9cb3c008b1d` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6df536c5acbc0abd6f119d02e24f4a2ed97707f4` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4498467a8af06cfa3d71cb04bd7c4170dec8f449` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.12`
  - unaffected: `before 2.6.12` (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: `6.12.112 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.55 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.9 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

- 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:** 0.0069, the 53rd percentile, on 9 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 18 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98548](https://www.cve.org/CVERecord?id=CVE-2026-98548)
- [NVD: CVE-2026-98548](https://nvd.nist.gov/vuln/detail/CVE-2026-98548)

### References from the CNA

- <https://git.kernel.org/stable/c/c0af3fd150fdc43821df3bb77e5ec74faf4dfc7a>
- <https://git.kernel.org/stable/c/854c053c71459f8db7ef07db9cfa4eec5f5206f2>
- <https://git.kernel.org/stable/c/965e21ea16acb394d5e5801998ca9b0adc669665>
- <https://git.kernel.org/stable/c/1cd246b214dc9acf4e2f11d58c035e1e672fe7d2>
- <https://git.kernel.org/stable/c/d68c9287b3ca0d6faadc61fbcb18d1a6b5493321>
- <https://git.kernel.org/stable/c/ec23855274a73906b02f0d124fefd9cb3c008b1d>
- <https://git.kernel.org/stable/c/6df536c5acbc0abd6f119d02e24f4a2ed97707f4>
- <https://git.kernel.org/stable/c/4498467a8af06cfa3d71cb04bd7c4170dec8f449>

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-2026-98548>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98548/>. Everything for agents: <https://agentprime.io/llms.txt>.