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CVE-2024-35985

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf() It was possible to have pick_eevdf() return NULL, which…

Published May 20, 2024CWE-476EPSS 0.23%

Overview

CVE-2024-35985 is a medium-severity vulnerability. It was published on May 20, 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:

sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()

It was possible to have pick_eevdf() return NULL, which then causes a

NULL-deref. This turned out to be due to entity_eligible() returning

falsely negative because of a s64 multiplcation overflow.

Specifically, reweight_eevdf() computes the vlag without considering

the limit placed upon vlag as update_entity_lag() does, and then the

scaling multiplication (remember that weight is 20bit fixed point) can

overflow. This then leads to the new vruntime being weird which then

causes the above entity_eligible() to go side-ways and claim nothing

is eligible.

Thus limit the range of vlag accordingly.

All this was quite rare, but fatal when it does happen.

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/06f27e6d7bf0abf54488259ef36bbf0e1fccb35cRefgit.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5feRefgit.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efbRefgit.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35cRefgit.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5feRefgit.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb

How CyberStrike helps

Frequently asked questions

What is CVE-2024-35985?

CVE-2024-35985 is a medium-severity vulnerability. It was published on May 20, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-35985?

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-2024-35985?

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-2024-35985?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-35985 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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