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Ubuntu: (CVE-2021-46993): linux vulnerability

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Ubuntu: (CVE-2021-46993): linux vulnerability

Severity
6
CVSS
(AV:L/AC:L/Au:S/C:C/I:N/A:C)
Published
02/28/2024
Created
11/21/2024
Added
11/19/2024
Modified
02/11/2025

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.

Solution(s)

  • ubuntu-upgrade-linux
  • ubuntu-upgrade-linux-aws
  • ubuntu-upgrade-linux-aws-5-4
  • ubuntu-upgrade-linux-aws-fips
  • ubuntu-upgrade-linux-azure
  • ubuntu-upgrade-linux-azure-5-4
  • ubuntu-upgrade-linux-azure-fips
  • ubuntu-upgrade-linux-bluefield
  • ubuntu-upgrade-linux-fips
  • ubuntu-upgrade-linux-gcp
  • ubuntu-upgrade-linux-gcp-5-4
  • ubuntu-upgrade-linux-gcp-fips
  • ubuntu-upgrade-linux-gkeop
  • ubuntu-upgrade-linux-hwe-5-4
  • ubuntu-upgrade-linux-kvm
  • ubuntu-upgrade-linux-oracle
  • ubuntu-upgrade-linux-oracle-5-4
  • ubuntu-upgrade-linux-raspi
  • ubuntu-upgrade-linux-raspi-5-4

References

  • https://attackerkb.com/topics/cve-2021-46993
  • CVE - 2021-46993
  • https://git.kernel.org/linus/6d2f8909a5fabb73fe2a63918117943986c39b6c
  • 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
  • https://www.cve.org/CVERecord?id=CVE-2021-46993
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