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CVE-2023-53020

4.7 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: l2tp: close all race conditions in l2tp_tunnel_register() The code in l2tp_tunnel_register() is racy in several ways: 1.

Published Mar 27, 2025CWE-362EPSS 0.14%

Overview

CVE-2023-53020 is a medium-severity vulnerability. It was published on March 27, 2025 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

l2tp: close all race conditions in l2tp_tunnel_register()

The code in l2tp_tunnel_register() is racy in several ways:

1. It modifies the tunnel socket _after_ publishing it.

2. It calls setup_udp_tunnel_sock() on an existing socket without

locking.

3. It changes sock lock class on fly, which triggers many syzbot

reports.

This patch amends all of them by moving socket initialization code

before publishing and under sock lock. As suggested by Jakub, the

l2tp lockdep class is not necessary as we can just switch to

bh_lock_sock_nested().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0b2c59720e65885a394a017d0cf9cab118914682Refgit.kernel.org/stable/c/2d77e5c0ad79004b5ef901895437e9cce6dfcc7eRefgit.kernel.org/stable/c/77e8ed776cdb1a24b2aab8fe7c6f1f154235e1ceRefgit.kernel.org/stable/c/cef0845b6dcfa2f6c2c832e7f9622551456c741d

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53020?

CVE-2023-53020 is a medium-severity vulnerability. It was published on March 27, 2025 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2023-53020?

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-53020?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-53020?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53020 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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