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CVE-2021-46993 Detail

Description

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.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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Hyperlink Resource
https://git.kernel.org/stable/c/3da3f804b82a0a382d523a21acf4cf3bb35f936d
https://git.kernel.org/stable/c/42ee47c7e3569d9a0e2cb5053c496d97d380472f
https://git.kernel.org/stable/c/687f523c134b7f0bd040ee1230f6d17990d54172
https://git.kernel.org/stable/c/6d2f8909a5fabb73fe2a63918117943986c39b6c
https://git.kernel.org/stable/c/f7347c85490b92dd144fa1fba9e1eca501656ab3

Weakness Enumeration

CWE-ID CWE Name Source

Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-46993
NVD Published Date:
02/28/2024
NVD Last Modified:
02/28/2024
Source:
kernel.org