Out-of-bounds Read Affecting kernel-rt package, versions *
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Test your applications- Snyk ID SNYK-RHEL7-KERNELRT-6328314
- published 29 Feb 2024
- disclosed 28 Feb 2024
Introduced: 28 Feb 2024
CVE-2021-46993 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:7 kernel-rt.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2021-46993
- 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