CVE-2024-35985 sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()

What is CVE-2024-35985?

CVE-2024-35985 is a medium-severity vulnerability in Linux kernel, published on 20 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-476

Which versions are affected by CVE-2024-35985?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-35985?

Apply the vendor's patch.

Is CVE-2024-35985 being exploited?

There is no known exploitation of CVE-2024-35985 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2024-35985, DEBIAN-CVE-2024-35985, GHSA-qp9g-95jm-jwfj, UBUNTU-CVE-2024-35985.