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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
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OR
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.3 up to (excluding) 5.4.120
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.38
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.22
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.5
Changed
Reference Type
https://git.kernel.org/stable/c/3da3f804b82a0a382d523a21acf4cf3bb35f936d No Types Assigned
New CVE Received from kernel.org2/28/2024 4:15:37 AM
Action
Type
Old Value
New Value
Added
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.
Added
Reference
Linux https://git.kernel.org/stable/c/3da3f804b82a0a382d523a21acf4cf3bb35f936d [No types assigned]
Added
Reference
Linux https://git.kernel.org/stable/c/42ee47c7e3569d9a0e2cb5053c496d97d380472f [No types assigned]
Added
Reference
Linux https://git.kernel.org/stable/c/687f523c134b7f0bd040ee1230f6d17990d54172 [No types assigned]
Added
Reference
Linux https://git.kernel.org/stable/c/6d2f8909a5fabb73fe2a63918117943986c39b6c [No types assigned]
Added
Reference
Linux https://git.kernel.org/stable/c/f7347c85490b92dd144fa1fba9e1eca501656ab3 [No types assigned]
Quick Info
CVE Dictionary Entry: CVE-2021-46993 NVD
Published Date: 02/28/2024 NVD
Last Modified: 06/17/2026
Source: kernel.org
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