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CVE-2024-26752

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: l2tp: pass correct message length to ip6_append_data l2tp_ip6_sendmsg needs to avoid accounting for the transport header twice…

Published Apr 3, 2024CWE-131EPSS 0.25%

Overview

CVE-2024-26752 is a medium-severity vulnerability. It was published on April 3, 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:

l2tp: pass correct message length to ip6_append_data

l2tp_ip6_sendmsg needs to avoid accounting for the transport header

twice when splicing more data into an already partially-occupied skbuff.

To manage this, we check whether the skbuff contains data using

skb_queue_empty when deciding how much data to append using

ip6_append_data.

However, the code which performed the calculation was incorrect:

ulen = len + skb_queue_empty(&sk->sk_write_queue) ? transhdrlen : 0;

...due to C operator precedence, this ends up setting ulen to

transhdrlen for messages with a non-zero length, which results in

corrupted packets on the wire.

Add parentheses to correct the calculation in line with the original

intent.

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/0da15a70395182ee8cb75716baf00dddc0bea38dRefgit.kernel.org/stable/c/13cd1daeea848614e585b2c6ecc11ca9c8ab2500Refgit.kernel.org/stable/c/359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79Refgit.kernel.org/stable/c/4c3ce64bc9d36ca9164dd6c77ff144c121011aaeRefgit.kernel.org/stable/c/804bd8650a3a2bf3432375f8c97d5049d845ce56Refgit.kernel.org/stable/c/83340c66b498e49353530e41542500fc8a4782d6Refgit.kernel.org/stable/c/c1d3a84a67db910ce28a871273c992c3d7f9efb5Refgit.kernel.org/stable/c/dcb4d14268595065c85dc5528056713928e17243Refgit.kernel.org/stable/c/0da15a70395182ee8cb75716baf00dddc0bea38dRefgit.kernel.org/stable/c/13cd1daeea848614e585b2c6ecc11ca9c8ab2500

How CyberStrike helps

Frequently asked questions

What is CVE-2024-26752?

CVE-2024-26752 is a medium-severity vulnerability. It was published on April 3, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-26752?

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-2024-26752?

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-2024-26752?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-26752 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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