CVE-2021-26338

Name: CVE-2021-26338
Creator: NVD / NIST
Published: 2021-11-16T18:15:07.387+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.90%

Last modified Jun 17, 2026

CVE-2021-26338 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Improper access controls in System Management Unit (SMU) may allow for an attacker to override performance control tables located in DRAM resulting in a potential lack of system resources.. EPSS estimates a 0.90% chance of exploitation in the next 30 days.

Description

Improper access controls in System Management Unit (SMU) may allow for an attacker to override performance control tables located in DRAM resulting in a potential lack of system resources.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.90%

55.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Amd	Epyc 7f72 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7f52 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7f32 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7h12 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7742 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7702 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7702p Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7662 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7642 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7552 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7542 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7532 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7502 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7502p Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7452 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7402 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7402p Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7352 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7302 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7302p Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7282 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7272 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7262 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7252 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7232p Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7763 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7713p Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7713 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7663 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7643 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 75f3 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7543p Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7543 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7513 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7453 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 74f3 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7443p Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7443 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7413 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 73f3 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7343 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7313p Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7313 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 72f3 Firmware	< milanpi-sp3_1.0.0.4

References

https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021Vendor Advisory

Timeline

Published: Nov 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26338?

Improper access controls in System Management Unit (SMU) may allow for an attacker to override performance control tables located in DRAM resulting in a potential lack of system resources.

How severe is CVE-2021-26338?

CVE-2021-26338 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.90% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26338?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26338?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST