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CVE-2021-46993

Severity CVSS v4.0:
Pending analysis
Type:
CWE-125 Out-of-bounds Read
Publication date:
28/02/2024
Last modified:
24/12/2024

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> sched: Fix out-of-bound access in uclamp<br /> <br /> Util-clamp places tasks in different buckets based on their clamp values<br /> for performance reasons. However, the size of buckets is currently<br /> computed using a rounding division, which can lead to an off-by-one<br /> error in some configurations.<br /> <br /> For instance, with 20 buckets, the bucket size will be 1024/20=51. A<br /> task with a clamp of 1024 will be mapped to bucket id 1024/51=20. Sadly,<br /> correct indexes are in range [0,19], hence leading to an out of bound<br /> memory access.<br /> <br /> Clamp the bucket id to fix the issue.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.10 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): High

Base Score 3.x
7.10
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.3 (including) 5.4.120 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.5 (including) 5.10.38 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.11.22 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.12 (including) 5.12.5 (excluding)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools