What is CVE-2021-26334?

CVE-2021-26334 is a critical-severity vulnerability in AMD Uprof, classified under Improper Access Control. CVSS score: 9.9/10. Published 2021-12-01.

How severe is CVE-2021-26334?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Vulnerability in AMD Uprof

CVE-2021-26334

The AMDPowerProfiler.sys driver of AMD μProf tool may allow lower privileged users to access MSRs in kernel which may lead to privilege escalation and ring-0 code execution by the lower privileged user.

Published 2021-12-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

www.amd.com/en/corporate/product-security/bulletin/amd-sb-1016 (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26334?: CVE-2021-26334 is a critical-severity vulnerability in AMD Uprof, classified under Improper Access Control. CVSS score: 9.9/10. Published 2021-12-01.
How severe is CVE-2021-26334?: Critical severity. CVSS v3 base score is 9.9 out of 10.