# tcp: fix corruption of urgent data on multi-segment retransmit

CVE record · `CVE-2026-90054`

- **Identifiers:** `CVE-2026-90054`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:05 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: `10d3be569243def8d92ac3722395ef5a59c504e6 to before 8eb51013b6308870479a64b4a2a018697b997849` (git)
  - affected: `10d3be569243def8d92ac3722395ef5a59c504e6 to before 711bfd762bec05fb19bc3b17cbb157c39f4e66da` (git)
  - affected: `10d3be569243def8d92ac3722395ef5a59c504e6 to before 3d4e005c198dc410ad568f832bffa7569c059ff8` (git)
  - affected: `10d3be569243def8d92ac3722395ef5a59c504e6 to before 4fd2ee4ac154c204d95d8db72221446dac5af9b8` (git)
  - affected: `10d3be569243def8d92ac3722395ef5a59c504e6 to before ebe55406404f3cb28e36d2b668e2c6c05026ec29` (git)
  - affected: `10d3be569243def8d92ac3722395ef5a59c504e6 to before b8f08a94b2a4addc39249dcf9c792e786108621b` (git)
  - affected: `10d3be569243def8d92ac3722395ef5a59c504e6 to before 47eb90299e6882d6445672530dd7c51ac33ebdbd` (git)
  - affected: `10d3be569243def8d92ac3722395ef5a59c504e6 to before ce2b807f42ed5e55567b8864ab72963f90779270` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.7`
  - unaffected: `before 4.7` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 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:** 0.0022, the 12th percentile, on 13 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 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90054](https://www.cve.org/CVERecord?id=CVE-2026-90054)
- [NVD: CVE-2026-90054](https://nvd.nist.gov/vuln/detail/CVE-2026-90054)

### References from the CNA

- <https://git.kernel.org/stable/c/8eb51013b6308870479a64b4a2a018697b997849>
- <https://git.kernel.org/stable/c/711bfd762bec05fb19bc3b17cbb157c39f4e66da>
- <https://git.kernel.org/stable/c/3d4e005c198dc410ad568f832bffa7569c059ff8>
- <https://git.kernel.org/stable/c/4fd2ee4ac154c204d95d8db72221446dac5af9b8>
- <https://git.kernel.org/stable/c/ebe55406404f3cb28e36d2b668e2c6c05026ec29>
- <https://git.kernel.org/stable/c/b8f08a94b2a4addc39249dcf9c792e786108621b>
- <https://git.kernel.org/stable/c/47eb90299e6882d6445672530dd7c51ac33ebdbd>
- <https://git.kernel.org/stable/c/ce2b807f42ed5e55567b8864ab72963f90779270>

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-2026-90054>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90054/>. Everything for agents: <https://agentprime.io/llms.txt>.