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Vulnerabilities

Vulnerability · CVE-2022-4129

A flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP).

Published Nov 28, 2022 · catalog updated Oct 14, 2026 · layer 2 tunneling protocol

Check if you run it

No confirmed exploitation is on record for CVE-2022-4129. EPSS is 0.18%. Act only if a listed version of layer 2 tunneling protocol is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Not established
Affected products
cpe fedoraproject/fedora · cpe linux/layer 2 tunneling protocol

A flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP). A missing lock when clearing sk_user_data can lead to a race condition and NULL pointer dereference. A local user could use this flaw to potentially crash the system causing a denial of service.

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.

  • cpe fedoraproject/fedora35
  • cpe fedoraproject/fedora36
  • cpe fedoraproject/fedora37
  • cpe linux/layer 2 tunneling protocolversion unspecified

How to fix CVE-2022-4129

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-2022-4129. EPSS is 0.18%. Act only if a listed version of layer 2 tunneling protocol is installed.

Which versions are affected?

Compare what you have installed with 35, 36, 37. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-667. 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.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 28, 2022 · NIST NVD

    Detected

    A flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP). A missing lock when clearing sk_user_data can lead to a race condition and NULL pointer dereference. A local user could use this flaw to potentially crash the system causing a denial of service.

  2. Oct 14, 2026 · NIST NVD

    Updated

    A flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP). A missing lock when clearing sk_user_data can lead to a race condition and NULL pointer dereference. A local user could use this flaw to potentially crash the system causing a denial of service.

Sources

  • CVE.orgVulnerability recordCVE-2022-4129

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2022-4129

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2022-4129

    A flaw was found in the Linux kernel's Layer 2 Tunneling Protocol (L2TP). A missing lock when clearing sk_user_data can lead to a race condition and NULL pointer dereference. A local user could use this flaw to potentially crash the system causing a denial of service.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.