# tcp: exclude old ACKs from tcp fast path

CVE record · `CVE-2026-98255`

- **Identifiers:** `CVE-2026-98255`
- **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, 08:45 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: `31770e34e43d6c8dee129bfee77e56c34e61f0e5 to before 07cacab90290f795bad2e566790f4ba8e84cdf5f` (git)
  - affected: `31770e34e43d6c8dee129bfee77e56c34e61f0e5 to before 6eb9b697f50b73b9684e466c1e97f4ca8e947a59` (git)
  - affected: `31770e34e43d6c8dee129bfee77e56c34e61f0e5 to before b86e1e5a4bbcbbccde8b7a3d3486604b581f6628` (git)
  - affected: `31770e34e43d6c8dee129bfee77e56c34e61f0e5 to before 1c8448db5cf35a13d82b0c9004ffdb49358883e7` (git)
  - affected: `31770e34e43d6c8dee129bfee77e56c34e61f0e5 to before 8309dc2cc360056aa9cd2acfbfc25930798c3b66` (git)
  - affected: `31770e34e43d6c8dee129bfee77e56c34e61f0e5 to before ff037920c688ae6ca1153fec01e90e6782712455` (git)
  - affected: `31770e34e43d6c8dee129bfee77e56c34e61f0e5 to before 8205ac5ddb42a1843fa8d6a8c295b5c7f4f8c6ed` (git)
  - affected: `31770e34e43d6c8dee129bfee77e56c34e61f0e5 to before f81e6c3fb06327bc49cdd6e559845293ba06a704` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.14`
  - unaffected: `before 4.14` (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: `6.18.54 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-2026-98255](https://www.cve.org/CVERecord?id=CVE-2026-98255)
- [NVD: CVE-2026-98255](https://nvd.nist.gov/vuln/detail/CVE-2026-98255)

### References from the CNA

- <https://git.kernel.org/stable/c/07cacab90290f795bad2e566790f4ba8e84cdf5f>
- <https://git.kernel.org/stable/c/6eb9b697f50b73b9684e466c1e97f4ca8e947a59>
- <https://git.kernel.org/stable/c/b86e1e5a4bbcbbccde8b7a3d3486604b581f6628>
- <https://git.kernel.org/stable/c/1c8448db5cf35a13d82b0c9004ffdb49358883e7>
- <https://git.kernel.org/stable/c/8309dc2cc360056aa9cd2acfbfc25930798c3b66>
- <https://git.kernel.org/stable/c/ff037920c688ae6ca1153fec01e90e6782712455>
- <https://git.kernel.org/stable/c/8205ac5ddb42a1843fa8d6a8c295b5c7f4f8c6ed>
- <https://git.kernel.org/stable/c/f81e6c3fb06327bc49cdd6e559845293ba06a704>

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-2026-98255>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98255/>. Everything for agents: <https://agentprime.io/llms.txt>.