What is CVE-2021-46993?

CVE-2021-46993 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10, classified as a Out-of-bounds Read flaw (CWE-125), affecting Linux kernel versions from 5.3 onward and patched in 5.4.120, 5.10.38, 5.11.22 and others. CVE-2021-46993 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-46993?

CVE-2021-46993 has a CVSS score of 7.1 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Is there a patch available for CVE-2021-46993?

Yes, CVE-2021-46993 has been patched. Fixed versions include 5.4.120, 5.10.38, 5.11.22 and others. If you are running Linux kernel 5.3 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-46993 actively exploited?

CVE-2021-46993 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2021-46993

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.

Package Linux Kernel

Published 2024-02-28

Last modified 2024-12-24

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.1

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weakness type

CWE-125

CVE-2021-46993 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.3 and later are affected. Fixed in 5.4.120, 5.10.38, 5.11.22, 5.12.5, 5.13 and their respective stable series.

Affected from

≥ 5.3

Fixed in

✓ 5.4.120 5.4.x ✓ 5.10.38 5.10.x ✓ 5.11.22 5.11.x ✓ 5.12.5 5.12.x ✓ 5.13

References

5 total

Kernel Git
https://git.kernel.org/stable/c/3da3f804b82a0a382d523a21acf4cf3bb35f936d

Patch
Kernel Git
https://git.kernel.org/stable/c/42ee47c7e3569d9a0e2cb5053c496d97d380472f

Patch
Kernel Git
https://git.kernel.org/stable/c/687f523c134b7f0bd040ee1230f6d17990d54172

Patch
Kernel Git
https://git.kernel.org/stable/c/6d2f8909a5fabb73fe2a63918117943986c39b6c

Patch
Kernel Git
https://git.kernel.org/stable/c/f7347c85490b92dd144fa1fba9e1eca501656ab3

Patch

Details

CVE ID CVE-2021-46993

Severity High

CVSS score 7.1 / 10

CVSS version 3.1

Published 2024-02-28

Modified 2024-12-24

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-46993?

CVE-2021-46993 is a High severity Linux kernel vulnerability with a CVSS score of 7.1 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . It affects Linux kernel versions from 5.3 onward and has been patched in 5.4.120, 5.10.38, 5.11.22 and others. CVE-2021-46993 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-46993?

CVE-2021-46993 has a CVSS score of 7.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
Is there a patch available for CVE-2021-46993?

Yes. CVE-2021-46993 has been patched. Fixed versions include 5.4.120, 5.10.38, 5.11.22 and others. If you are running Linux kernel 5.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-46993 actively exploited?

No. CVE-2021-46993 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.