# tcp: prevent collapsing skbs across boundary in rtx queue

CVE record · `CVE-2026-98549`

- **Identifiers:** `CVE-2026-98549`
- **State:** Confirmed
- **Severity:** CVSS 9.1 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 18 Oct 2026
- **Updated:** 30 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 9.1: 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: `e8f69799810c32dd40c6724d829eccc70baad07f to before bf785a303e5faad16439c563826a07cb811856c8` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before 7061aafc680e14e22b191f178b768886475f8524` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before 533344a00ad968181e60d0980c076a9d0de57482` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before 9e2a2f98e8c0197108c6d97a1fa43bfd89071c30` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before 1ae7aee395245874d797890380d9192bd858fb7e` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before 7ba87509c54cd519e7ed362e0c85e8431f066a18` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before 08e835f5ec6e261c79d8c39f8618b3af29e3b0da` (git)
  - affected: `e8f69799810c32dd40c6724d829eccc70baad07f to before fc6d80eb504458d6416b75a94188b268c95c6533` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.18`
  - unaffected: `before 4.18` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (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: `6.12.112 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

- 9.1 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0056, the 46th percentile, on 7 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-2026-98549](https://www.cve.org/CVERecord?id=CVE-2026-98549)
- [NVD: CVE-2026-98549](https://nvd.nist.gov/vuln/detail/CVE-2026-98549)

### References from the CNA

- <https://git.kernel.org/stable/c/bf785a303e5faad16439c563826a07cb811856c8>
- <https://git.kernel.org/stable/c/7061aafc680e14e22b191f178b768886475f8524>
- <https://git.kernel.org/stable/c/533344a00ad968181e60d0980c076a9d0de57482>
- <https://git.kernel.org/stable/c/9e2a2f98e8c0197108c6d97a1fa43bfd89071c30>
- <https://git.kernel.org/stable/c/1ae7aee395245874d797890380d9192bd858fb7e>
- <https://git.kernel.org/stable/c/7ba87509c54cd519e7ed362e0c85e8431f066a18>
- <https://git.kernel.org/stable/c/08e835f5ec6e261c79d8c39f8618b3af29e3b0da>
- <https://git.kernel.org/stable/c/fc6d80eb504458d6416b75a94188b268c95c6533>

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-2026-98549>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98549/>. Everything for agents: <https://agentprime.io/llms.txt>.