CVE-2024-35985

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Source
https://cve.org/CVERecord?id=CVE-2024-35985
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-35985.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-35985
Downstream
Published
2024-05-20T09:47:52Z
Modified
2026-05-18T05:57:50Z
Summary
sched/eevdf: Prevent vlag from going out of bounds in reweight_eevdf()
Details

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.

Database specific 
{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/35xxx/CVE-2024-35985.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
14204acc09f652169baed1141c671429047b1313
Fixed
470d347b14b0ecffa9b39cf8f644fa2351db3efb
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
eab03c23c2a162085b13200d7942fc5a00b5ccc8
Fixed
06f27e6d7bf0abf54488259ef36bbf0e1fccb35c
Fixed
1560d1f6eb6b398bddd80c16676776c0325fe5fe

Affected versions

v6.*
v6.6.10
v6.6.11
v6.6.12
v6.6.13
v6.6.14
v6.6.15
v6.6.16
v6.6.17
v6.6.18
v6.6.19
v6.6.20
v6.6.21
v6.6.22
v6.6.23
v6.6.24
v6.6.25
v6.6.26
v6.6.27
v6.6.28
v6.6.29
v6.6.4
v6.6.5
v6.6.6
v6.6.7
v6.6.8
v6.6.9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-35985.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.6.30
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.8.9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-35985.json"