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Vulnerabilities

Vulnerability · CVE-2025-40214

In the Linux kernel, the following vulnerability has been resolved: af_unix: Initialise scc_index in unix_add_edge().

Published Dec 4, 2025 · catalog updated Aug 5, 2026 · Linux Linux

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-40214. EPSS is 0.18%. Act only if a listed version of Linux Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Version ranges on file
Affected products
vendor Linux Linux d23802221f6755e104606864067c71af8cdb6788 <4cd8d755c7d4f515dd9abf483316aca2f1b7b0f3

In the Linux kernel, the following vulnerability has been resolved: af_unix: Initialise scc_index in unix_add_edge(). Quang Le reported that the AF_UNIX GC could garbage-collect a receive queue of an alive in-flight socket, with a nice repro. The repro consists of three stages. 1) 1-a. Create a single cyclic reference with many sockets 1-b. close() all sockets 1-c. Trigger GC 2) 2-a. Pass sk-A to an embryo sk-B 2-b. Pass sk-X to sk-X 2-c. Trigger GC 3) 3-a. accept() the embryo sk-B 3-b. Pass sk-B to sk-C 3-c. close() the in-flight sk-A 3-d. Trigger GC As of 2-c, sk-A and sk-X are linked to uni

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Linux Linux d23802221f6755e104606864067c71af8cdb6788 <4cd8d755c7d4f515dd9abf483316aca2f1b7b0f3d23802221f6755e104606864067c71af8cdb6788 <4cd8d755c7d4f515dd9abf483316aca2f1b7b0f3

How to fix CVE-2025-40214

  • Upgrade

    CVE-2025-40214 lists a fix boundary at 4cd8d755c7d4f515dd9abf483316aca2f1b7b0f3. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in d23802221f6755e104606864067c71af8cdb6788 <4cd8d755c7d4f515dd9abf483316aca2f1b7b0f3

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-40214. EPSS is 0.18%. Act only if a listed version of Linux Linux is installed.

Which versions are affected?

Compare what you have installed with Linux Linux d23802221f6755e104606864067c71af8cdb6788 <4cd8d755c7d4f515dd9abf483316aca2f1b7b0f3 d23802221f6755e104606864067c71af8cdb6788 <4cd8d755c7d4f515dd9abf483316aca2f1b7b0f3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 4, 2025 · EUVD

    Detected

    In the Linux kernel, the following vulnerability has been resolved: af_unix: Initialise scc_index in unix_add_edge(). Quang Le reported that the AF_UNIX GC could garbage-collect a receive queue of an alive in-flight socket, with a nice repro. The repro consists of three stages. 1) 1-a. Create a single cyclic reference with many sockets 1-b. close() all sockets 1-c. Trigger GC 2) 2-a. Pass sk-A to

  2. Aug 5, 2026 · EUVD

    Updated

    In the Linux kernel, the following vulnerability has been resolved: af_unix: Initialise scc_index in unix_add_edge(). Quang Le reported that the AF_UNIX GC could garbage-collect a receive queue of an alive in-flight socket, with a nice repro. The repro consists of three stages. 1) 1-a. Create a single cyclic reference with many sockets 1-b. close() all sockets 1-c. Trigger GC 2) 2-a. Pass sk-A to

Sources

  • CVE.orgVulnerability recordCVE-2025-40214

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-40214

    30-day exploitation probability 0.18%

    first.org
  • EUVDVulnerability recordEUVD-2025-201158

    In the Linux kernel, the following vulnerability has been resolved: af_unix: Initialise scc_index in unix_add_edge(). Quang Le reported that the AF_UNIX GC could garbage-collect a receive queue of an alive in-flight socket, with a nice repro. The repro consists of three stages. 1

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 1, 2026
  • CVE.orgOct 26, 2026
  • EUVDOct 26, 2026