CVE-2021-26401

Name: CVE-2021-26401
Creator: NVD / NIST
Published: 2022-03-11T18:15:11.327+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.6/10EPSS 0.28%

Last modified Jun 17, 2026

CVE-2021-26401 is a medium-severity vulnerability rated 5.6/10 on the CVSS scale. LFENCE/JMP (mitigation V2-2) may not sufficiently mitigate CVE-2017-5715 on some AMD CPUs.. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

5.6/10

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

EPSS Probability

0.28%

20.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Amd	Athlon X4 940 Firmware	All versions
Amd	Athlon X4 950 Firmware	All versions
Amd	Athlon X4 970 Firmware	All versions
Amd	Athlon X4 835 Firmware	All versions
Amd	Athlon X4 845 Firmware	All versions
Amd	Athlon X4 830 Firmware	All versions
Amd	Athlon X4 840 Firmware	All versions
Amd	Athlon X4 860k Firmware	All versions
Amd	Athlon X4 870k Firmware	All versions
Amd	Athlon X4 880k Firmware	All versions
Amd	Athlon X4 750 Firmware	All versions
Amd	Athlon X4 760k Firmware	All versions
Amd	Ryzen Threadripper Pro 5995wx Firmware	All versions
Amd	Ryzen Threadripper Pro 5975wx Firmware	All versions
Amd	Ryzen Threadripper Pro 5965wx Firmware	All versions
Amd	Ryzen Threadripper Pro 5955wx Firmware	All versions
Amd	Ryzen Threadripper Pro 5945wx Firmware	All versions
Amd	Ryzen Threadripper 2990wx Firmware	All versions
Amd	Ryzen Threadripper 2970wx Firmware	All versions
Amd	Ryzen Threadripper 2950x Firmware	All versions
Amd	Ryzen Threadripper 2920x Firmware	All versions
Amd	Ryzen Threadripper 3970x Firmware	All versions
Amd	A12-9730p Firmware	All versions
Amd	A12-9700p Firmware	All versions
Amd	A10-9630p Firmware	All versions
Amd	A10-9600p Firmware	All versions
Amd	A9-9420 Firmware	All versions
Amd	A9-9410 Firmware	All versions
Amd	A6-9220 Firmware	All versions
Amd	A6-9220c Firmware	All versions
Amd	A6-9210 Firmware	All versions
Amd	A4-9120 Firmware	All versions
Amd	Ryzen 7 2700x Firmware	All versions
Amd	Ryzen 7 2700 Firmware	All versions
Amd	Ryzen 5 2600x Firmware	All versions
Amd	Ryzen 5 2600 Firmware	All versions
Amd	Ryzen 9 3950x Firmware	All versions
Amd	Ryzen 9 3900x Firmware	All versions
Amd	Ryzen 7 3800x Firmware	All versions
Amd	Ryzen 7 3700x Firmware	All versions
Amd	Ryzen 5 3600x Firmware	All versions
Amd	Ryzen 5 3600 Firmware	All versions
Amd	Ryzen 5 3400g Firmware	All versions
Amd	Ryzen 3 3300x Firmware	All versions
Amd	Ryzen 3 3300g Firmware	All versions
Amd	Ryzen 3 3100 Firmware	All versions
Amd	Ryzen 7 4700g Firmware	All versions
Amd	Ryzen 7 4700ge Firmware	All versions
Amd	Ryzen 5 4600g Firmware	All versions
Amd	Ryzen 5 4600ge Firmware	All versions

Showing 50 of 126 affected configurations. See NVD for the full list.

References

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

Timeline

Published: Mar 11, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26401?

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

How severe is CVE-2021-26401?

CVE-2021-26401 has a CVSS score of 5.6/10 (MEDIUM severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26401?

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-2021-26401?

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

Scan your code now

Source: NVD / NIST