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

CVE record · `CVE-2026-99139`

- **Identifiers:** `CVE-2026-99139`
- **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 a60e62705c17534d6b6539de7b3a40c259e6827f` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before 4b0930d66dde0a1d1898f0edbbb5496c4dfa5f03` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before 08dc5c62c09653d1c4ba67a009beb138486c2604` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before c1804ef016392dd91267d2207ee43b1de34302ca` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before a8e45471afa230c1431c26c8e99ec24377e3b514` (git)
  - affected: `0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2 to before 5271b79b7ad68dcb222e893773f92bdabf7750f3` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.6`
  - unaffected: `before 5.6` (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:** 0.0017, the 6th 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-2026-99139](https://www.cve.org/CVERecord?id=CVE-2026-99139)
- [NVD: CVE-2026-99139](https://nvd.nist.gov/vuln/detail/CVE-2026-99139)

### References from the CNA

- <https://git.kernel.org/stable/c/a60e62705c17534d6b6539de7b3a40c259e6827f>
- <https://git.kernel.org/stable/c/4b0930d66dde0a1d1898f0edbbb5496c4dfa5f03>
- <https://git.kernel.org/stable/c/08dc5c62c09653d1c4ba67a009beb138486c2604>
- <https://git.kernel.org/stable/c/c1804ef016392dd91267d2207ee43b1de34302ca>
- <https://git.kernel.org/stable/c/a8e45471afa230c1431c26c8e99ec24377e3b514>
- <https://git.kernel.org/stable/c/5271b79b7ad68dcb222e893773f92bdabf7750f3>

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-2026-99139>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99139/>. Everything for agents: <https://agentprime.io/llms.txt>.