Tracker / CVE-2021-46993
CVE-2021-46993
High 7.8
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.
Affected products and versions
| linux | linux_kernel · 5.11 → 5.11.22 |
|---|---|
| linux | linux_kernel · 5.12 → 5.12.5 |
| linux | linux_kernel · 5.3 → 5.4.120 |
| linux | linux_kernel · 5.5 → 5.10.38 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.