linux: In the Linux kernel, the following vulnerability has been resolved: sched: Fix out-of-bound access in uclamp Util-c...
CVE-2021-46993 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-46993, released February 28, 2024. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 5.10.38-1 | DEBIAN-CVE-2021-46993 | Feb 28, 2024 |
| linux · Debian 13.5 (trixie) | 5.10.38-1 | DEBIAN-CVE-2021-46993 | Feb 28, 2024 |
| linux · Debian 14 | 5.10.38-1 | DEBIAN-CVE-2021-46993 | Feb 28, 2024 |
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