CVE-2024-35985: sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()
First published: Mon May 20 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.106-3 6.1.112-1 6.10.11-1 6.11.2-1 |
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Reference Links
- https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c
- https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe
- https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb
- https://launchpad.net/bugs/cve/CVE-2024-35985
- https://git.kernel.org/linus/1560d1f6eb6b398bddd80c16676776c0325fe5fe
- https://security-tracker.debian.org/tracker/CVE-2024-35985
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-35985
- https://nvd.nist.gov/vuln/detail/CVE-2024-35985
- https://ubuntu.com/security/CVE-2024-35985
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