What is CVE-2021-46937?

CVE-2021-46937 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.15 onward and patched in 5.15.13 and 5.16. CVE-2021-46937 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-46937?

CVE-2021-46937 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Is there a patch available for CVE-2021-46937?

Yes, CVE-2021-46937 has been patched. Fixed versions include 5.15.13 and 5.16. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-46937 actively exploited?

CVE-2021-46937 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-46937

Medium

In the Linux kernel, the following vulnerability has been resolved: mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()' DAMON debugfs interface increases the reference counts of 'struct pid's for targets from the 'target_ids' file write callback ('dbgfs_target_ids_write()'), but decreases the counts only in DAMON monitoring termination callback ('dbgfs_before_terminate()'). Therefore, when 'target_ids' file is repeatedly written without DAMON monitoring start/termination, the reference count is not decreased and therefore memory for the 'struct pid' cannot be freed. This commit fixes this issue by decreasing the reference counts when 'target_ids' is written.

Package Linux Kernel

Published 2024-02-27

Last modified 2024-11-21

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Vector string

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

Weakness type

CWE-668

CVE-2021-46937 is classified as CWE-668

See CWE-668 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 5.15 and later are affected. Fixed in 5.15.13, 5.16 and their respective stable series.

Affected from

≥ 5.15

Fixed in

✓ 5.15.13 5.15.x ✓ 5.16

References

2 total

Kernel Git
https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71

Patch
Kernel Git
https://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141

Patch

Details

CVE ID CVE-2021-46937

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-02-27

Modified 2024-11-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-46937?

CVE-2021-46937 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.15 onward and has been patched in 5.15.13 and 5.16. CVE-2021-46937 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-46937?

CVE-2021-46937 has a CVSS score of 5.5 out of 10, rated Medium 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:N.
Is there a patch available for CVE-2021-46937?

Yes. CVE-2021-46937 has been patched. Fixed versions include 5.15.13 and 5.16. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-46937 actively exploited?

No. CVE-2021-46937 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.