What is CVE-2021-4453?

CVE-2021-4453 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Memory Leak flaw (CWE-401), affecting Linux kernel versions from 5.10 onward and patched in 5.10.88, 5.15.11 and 5.16. CVE-2021-4453 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-4453?

CVE-2021-4453 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:N/I:N/A:H.

Is there a patch available for CVE-2021-4453?

Yes, CVE-2021-4453 has been patched. Fixed versions include 5.10.88, 5.15.11 and 5.16. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-4453 actively exploited?

CVE-2021-4453 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2021-4453

Medium

In the Linux kernel, the following vulnerability has been resolved: drm/amd/pm: fix a potential gpu_metrics_table memory leak Memory is allocated for gpu_metrics_table in renoir_init_smc_tables(), but not freed in int smu_v12_0_fini_smc_tables(). Free it!

Package Linux Kernel

Published 2025-02-26

Last modified 2025-10-01

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

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-401

CVE-2021-4453 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.10 and later are affected. Fixed in 5.10.88, 5.15.11, 5.16 and their respective stable series.

Affected from

≥ 5.10

Fixed in

✓ 5.10.88 5.10.x ✓ 5.15.11 5.15.x ✓ 5.16

References

The following references provide additional information about CVE-2021-4453 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/222cebd995cdf11fe0d502749560f65e64990e55
Patch
Kernel patch commit
https://git.kernel.org/stable/c/257b3bb16634fd936129fe2f57a91594a75b8751
Patch
Kernel patch commit
https://git.kernel.org/stable/c/aa464957f7e660abd554f2546a588f6533720e21
Patch

Details

CVE ID CVE-2021-4453

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-02-26

Modified 2025-10-01

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-4453?

CVE-2021-4453 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a Memory Leak flaw (CWE-401) . It affects Linux kernel versions from 5.10 onward and has been patched in 5.10.88, 5.15.11 and 5.16. CVE-2021-4453 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-4453?

CVE-2021-4453 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:N/I:N/A:H.
Is there a patch available for CVE-2021-4453?

Yes — CVE-2021-4453 has been patched. Fixed versions include 5.10.88, 5.15.11 and 5.16. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-4453 actively exploited?

No — CVE-2021-4453 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. View CWE-401 on MITRE CWE →