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prionPRIOn knowledge basePRION:CVE-2021-46993
HistoryFeb 28, 2024 - 9:15 a.m.

Spoofing

2024-02-2809:15:00
PRIOn knowledge base
www.prio-n.com
4
linux kernel
sched vulnerability
uclamp
out-of-bound access
nvd

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.7%

In the Linux kernel, the following vulnerability has been resolved:

sched: Fix out-of-bound access in uclamp

Util-clamp places tasks in different buckets based on their clamp values
for performance reasons. However, the size of buckets is currently
computed using a rounding division, which can lead to an off-by-one
error in some configurations.

For instance, with 20 buckets, the bucket size will be 1024/20=51. A
task with a clamp of 1024 will be mapped to bucket id 1024/51=20. Sadly,
correct indexes are in range [0,19], hence leading to an out of bound
memory access.

Clamp the bucket id to fix the issue.

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.7%