# CVE-2024-35985: linux: In the Linux kernel, the following vulnerability has been resolved:  sched/eevdf: Prevent vlag from going out of boun...

CVE-2024-35985 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-35985, released May 20, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-35985
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 20, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.8.9-1 | [DEBIAN-CVE-2024-35985](https://patchblox.com/security/data/fix/linux/debian-cve-2024-35985.md) | May 20, 2024 |
| Linux | linux Debian 14 | 6.8.9-1 | [DEBIAN-CVE-2024-35985](https://patchblox.com/security/data/fix/linux/debian-cve-2024-35985.md) | May 20, 2024 |

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