Executive Summary

Informations
Name CVE-2024-35985 First vendor Publication 2024-05-20
Vendor Cve Last vendor Modification 2024-05-20

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
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Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
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Detail

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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-35985

Sources (Detail)

https://git.kernel.org/stable/c/06f27e6d7bf0abf54488259ef36bbf0e1fccb35c
https://git.kernel.org/stable/c/1560d1f6eb6b398bddd80c16676776c0325fe5fe
https://git.kernel.org/stable/c/470d347b14b0ecffa9b39cf8f644fa2351db3efb
Source Url

Alert History

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0
Date Informations
2024-05-20 17:27:24
  • First insertion