What is CVE-2021-26368?

CVE-2021-26368 is a medium-severity vulnerability in AMD Athlon™ Series, classified under Insufficient Verification of Data Authenticity. CVSS score: 4.4/10. Published 2022-05-12.

How severe is CVE-2021-26368?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in AMD Athlon™ Series

CVE-2021-26368

Insufficient check of the process type in Trusted OS (TOS) may allow an attacker with privileges to enable a lesser privileged process to unmap memory owned by a higher privileged process resulting in a denial of service.

Published 2022-05-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.001 (3.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-26368?: CVE-2021-26368 is a medium-severity vulnerability in AMD Athlon™ Series, classified under Insufficient Verification of Data Authenticity. CVSS score: 4.4/10. Published 2022-05-12.
How severe is CVE-2021-26368?: Medium severity. CVSS v3 base score is 4.4 out of 10.