# tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)

CVE record · `CVE-2026-99138`

- **Identifiers:** `CVE-2026-99138`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 28 Oct 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 28 Oct 2026, 10:34 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: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before 7c312f17917455eedcea29735fa302ebb93cb9b9` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before 66b831b427301a9c3e485564009d476631413103` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before a8b024cbf62b497062c86995737fc303e4cc384e` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before 8d5fc9e6dc09174d0da6e59678eb8e01a890cbd3` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before e057d201640eebb8ed47ec924872c41570a3bd28` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before 86814e5370068ec2bf0caa6e6d55c3e5bfc6c324` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before 39aa489e85752f9de214edb0f85e4d578e57af29` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before 385e474086c2e7e29e2dded690be40dc273e20ee` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.6`
  - unaffected: `before 5.6` (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: `6.6.161 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.115 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.59 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.13 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 5 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 28 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-99138](https://www.cve.org/CVERecord?id=CVE-2026-99138)
- [NVD: CVE-2026-99138](https://nvd.nist.gov/vuln/detail/CVE-2026-99138)

### References from the CNA

- <https://git.kernel.org/stable/c/7c312f17917455eedcea29735fa302ebb93cb9b9>
- <https://git.kernel.org/stable/c/66b831b427301a9c3e485564009d476631413103>
- <https://git.kernel.org/stable/c/a8b024cbf62b497062c86995737fc303e4cc384e>
- <https://git.kernel.org/stable/c/8d5fc9e6dc09174d0da6e59678eb8e01a890cbd3>
- <https://git.kernel.org/stable/c/e057d201640eebb8ed47ec924872c41570a3bd28>
- <https://git.kernel.org/stable/c/86814e5370068ec2bf0caa6e6d55c3e5bfc6c324>
- <https://git.kernel.org/stable/c/39aa489e85752f9de214edb0f85e4d578e57af29>
- <https://git.kernel.org/stable/c/385e474086c2e7e29e2dded690be40dc273e20ee>

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-2026-99138>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99138/>. Everything for agents: <https://agentprime.io/llms.txt>.