# net/handshake: duplicate handshake cancellations leak socket

CVE record · `CVE-2025-68775`

- **Identifiers:** `CVE-2025-68775`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Weakness (CWE):** [CWE-662](https://cwe.mitre.org/data/definitions/662.html)
- **Tags:** [CWE-662](https://agentprime.io/advisories/tag/cwe-662.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 13 Jan 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 13 Jan 2026, 15:28 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 9.8: 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: `3b3009ea8abb713b022d94fba95ec270cf6e7eae to before 011ae80c49d9bfa5b4336f8bd387cd25c7593663` (git)
  - affected: `3b3009ea8abb713b022d94fba95ec270cf6e7eae to before e1641177e7fb48a0a5a06658d4aab51da6656659` (git)
  - affected: `3b3009ea8abb713b022d94fba95ec270cf6e7eae to before 3c330f1dee3cd92b57e19b9d21dc8ce5970b09be` (git)
  - affected: `3b3009ea8abb713b022d94fba95ec270cf6e7eae to before 15564bd67e2975002f2a8e9defee33e321d3183f` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.4`
  - unaffected: `before 6.4` (semver)
  - unaffected: `6.6.120 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.64 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.3 to 6.18.*, inclusive` (semver)
  - unaffected: `6.19 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0055, the 46th percentile, on 6 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 13 Jan 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2025-68775](https://www.cve.org/CVERecord?id=CVE-2025-68775)
- [NVD: CVE-2025-68775](https://nvd.nist.gov/vuln/detail/CVE-2025-68775)

### References from the CNA

- <https://git.kernel.org/stable/c/011ae80c49d9bfa5b4336f8bd387cd25c7593663>
- <https://git.kernel.org/stable/c/e1641177e7fb48a0a5a06658d4aab51da6656659>
- <https://git.kernel.org/stable/c/3c330f1dee3cd92b57e19b9d21dc8ce5970b09be>
- <https://git.kernel.org/stable/c/15564bd67e2975002f2a8e9defee33e321d3183f>

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-2025-68775>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2025-68775/>. Everything for agents: <https://agentprime.io/llms.txt>.