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Vulnerability record · CVE-2021-26401 · published 11 March 2022

CVE-2021-26401: Amd athlon x4 940 firmware vulnerability

AAmd · Athlon X4 940 Firmware

LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate CVE-2017-5715 on some AMD CPUs.

5.6 CVSS 3.1 Medium EPSS 0.29% · top 80.4%
5.6CVSS 3.1 base score, v2 1.9
0.29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
126Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate CVE-2017-5715 on some AMD CPUs.

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

Affected products

126 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2022/03/18/2 Mailing ListThird Party Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1036 Vendor Advisory
http://www.openwall.com/lists/oss-security/2022/03/18/2 Mailing ListThird Party Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1036 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.5CVE-2022-23825Debian linux exposure of resource to wrong sphere vulnerabilityAliases in the branch predictor may cause some AMD processors to predict the wrong branch type potentially leading to information disclosure.EPSS 0.78%6.5CVE-2022-29900Debian linux vulnerabilityMis-trained branch predictions for return instructions may allow arbitrary speculative code execution under certain microarchitecture-dependent condi…EPSS 3.9%6.5CVE-2022-23823Amd athlon x4 750 firmware observable discrepancy vulnerabilityA potential vulnerability in some AMD processors using frequency scaling may allow an authenticated attacker to execute a timing attack to potentiall…EPSS 1.2%6.5CVE-2021-26341Amd athlon x4 940 firmware vulnerabilitySome AMD CPUs may transiently execute beyond unconditional direct branches, which may potentially result in data leakage.EPSS 0.32%5.5CVE-2022-23824Xen vulnerabilityIBPB may not prevent return branch predictions from being specified by pre-IBPB branch targets leading to a potential information disclosure.EPSS 0.59%4.7CVE-2022-27672Amd athlon x4 750 firmware vulnerabilityWhen SMT is enabled, certain AMD processors may speculatively execute instructions using a target from the sibling thread after an SMT mode switch po…EPSS 0.28%

Source: NIST National Vulnerability Database (record CVE-2021-26401), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.