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CVE-2024-36244

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: extend minimum interval restriction to entire cycle too It is possible for syzbot to side-step the restricti…

Published Jun 21, 2024EPSS 0.25%

Overview

CVE-2024-36244 is a medium-severity vulnerability. It was published on June 21, 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/sched: taprio: extend minimum interval restriction to entire cycle too

It is possible for syzbot to side-step the restriction imposed by the

blamed commit in the Fixes: tag, because the taprio UAPI permits a

cycle-time different from (and potentially shorter than) the sum of

entry intervals.

We need one more restriction, which is that the cycle time itself must

be larger than N * ETH_ZLEN bit times, where N is the number of schedule

entries. This restriction needs to apply regardless of whether the cycle

time came from the user or was the implicit, auto-calculated value, so

we move the existing "cycle == 0" check outside the "if "(!new->cycle_time)"

branch. This way covers both conditions and scenarios.

Add a selftest which illustrates the issue triggered by syzbot.

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/34d83c3e6e97867ae061d14eb52123404aab1cbcRefgit.kernel.org/stable/c/91f249b01fe490fce11fbb4307952ca8cce78724Refgit.kernel.org/stable/c/b939d1e04a90248b4cdf417b0969c270ceb992b2Refgit.kernel.org/stable/c/fb66df20a7201e60f2b13d7f95d031b31a8831d3Refgit.kernel.org/stable/c/91f249b01fe490fce11fbb4307952ca8cce78724Refgit.kernel.org/stable/c/b939d1e04a90248b4cdf417b0969c270ceb992b2Refgit.kernel.org/stable/c/fb66df20a7201e60f2b13d7f95d031b31a8831d3Reflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-36244?

CVE-2024-36244 is a medium-severity vulnerability. It was published on June 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-36244?

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-2024-36244?

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-2024-36244?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-36244 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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