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CVE-2024-53211

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net/l2tp: fix warning in l2tp_exit_net found by syzbot In l2tp's net exit handler, we check that an IDR is empty before destroy…

Published Dec 27, 2024EPSS 0.19%

Overview

CVE-2024-53211 is a medium-severity vulnerability. It was published on December 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, 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:

net/l2tp: fix warning in l2tp_exit_net found by syzbot

In l2tp's net exit handler, we check that an IDR is empty before

destroying it:

WARN_ON_ONCE(!idr_is_empty(&pn->l2tp_tunnel_idr));

idr_destroy(&pn->l2tp_tunnel_idr);

By forcing memory allocation failures in idr_alloc_32, syzbot is able

to provoke a condition where idr_is_empty returns false despite there

being no items in the IDR. This turns out to be because the radix tree

of the IDR contains only internal radix-tree nodes and it is this that

causes idr_is_empty to return false. The internal nodes are cleaned by

idr_destroy.

Use idr_for_each to check that the IDR is empty instead of

idr_is_empty to avoid the problem.

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/5d066766c5f1252f98ff859265bcd1a5b52ac46cRefgit.kernel.org/stable/c/a487cc8986d6dd75b60b59004f3bd2ea9b4dd541

How CyberStrike helps

Frequently asked questions

What is CVE-2024-53211?

CVE-2024-53211 is a medium-severity vulnerability. It was published on December 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-53211?

This vulnerability has a CVSS 3.1 base score of 5.5, 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-2024-53211?

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-2024-53211?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-53211 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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