CVE-2021-26339: Medium severity amd epyc 7763 firmware vulnerability

Published May 11, 2022
·
Updated

A bug in AMD CPU’s core logic may allow for an attacker, using specific code from an unprivileged VM, to trigger a CPU core hang resulting in a potential denial of service. AMD believes the specific code includes a specific x86 instruction sequence that would not be generated by compilers.

Affected Software

168 affected components
AMD Epyc 7763 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7763
AMD Epyc 7713p Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7713p
AMD Epyc 7713 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7713
AMD Epyc 7663 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7663
AMD Epyc 7643 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7643
AMD Epyc 75f3 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 75f3
AMD Epyc 7543p Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7543p
AMD Epyc 7543 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7543
AMD Epyc 7513 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7513
AMD Epyc 7453 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7453
AMD Epyc 74f3 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 74f3
AMD Epyc 7443p Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7443p
AMD Epyc 7443 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7443
AMD Epyc 7413 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7413
AMD Epyc 73f3 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 73f3
AMD Epyc 7343 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7343
AMD Epyc 7313p Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7313p
AMD Epyc 7313 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7313
AMD Epyc 72f3 Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 72f3
AMD Epyc 7773x Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7773x
AMD Epyc 7473x Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7473x
AMD Epyc 7573x Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7573x
AMD Epyc 7373x Firmware<milanpi-sp3_1.0.0.7
AMD Epyc 7373x
AMD Ryzen 7 5700g Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 7 5700g
AMD Ryzen 7 5700ge Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 7 5700ge
AMD Ryzen 5 5700g Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 5 5700g
AMD Ryzen 5 5700ge Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 5 5700ge
AMD Ryzen 3 5300g Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 3 5300g
AMD Ryzen 3 5300ge Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 3 5300ge
AMD Ryzen 7 4700g Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 7 4700g
AMD Ryzen 7 4700ge Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 7 4700ge
AMD Ryzen 5 4600g Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 5 4600g
AMD Ryzen 5 4600ge Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 5 4600ge
AMD Ryzen 3 4300g Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 3 4300g
AMD Ryzen 3 4300ge Firmware<comboam4_v2_pi_1.2.0.6c
AMD Ryzen 3 4300ge
AMD Ryzen Threadripper Pro 3945wx Firmware
AMD Ryzen Threadripper Pro 3945wx
AMD Ryzen Threadripper Pro 3955wx Firmware
AMD Ryzen Threadripper Pro 3955wx
AMD Ryzen Threadripper Pro 3975wx Firmware
AMD Ryzen Threadripper Pro 3975wx
AMD Ryzen Threadripper Pro 3995wx Firmware
AMD Ryzen Threadripper Pro 3995wx
AMD Ryzen Threadripper Pro 5945wx Firmware
AMD Ryzen Threadripper Pro 5945wx
AMD Ryzen Threadripper Pro 5955wx Firmware
AMD Ryzen Threadripper Pro 5955wx
AMD Ryzen Threadripper Pro 5965wx Firmware
AMD Ryzen Threadripper Pro 5965wx
AMD Ryzen Threadripper Pro 5975wx Firmware
AMD Ryzen Threadripper Pro 5975wx
AMD Ryzen Threadripper Pro 5995wx Firmware
AMD Ryzen Threadripper Pro 5995wx
AMD Ryzen 3 2200u Firmware
AMD Ryzen 3 2200u
AMD Ryzen 3 2300u Firmware
AMD Ryzen 3 2300u
AMD Ryzen 3 Pro 2300u Firmware
AMD Ryzen 3 Pro 2300u
AMD Ryzen 5 2500u Firmware
AMD Ryzen 5 2500u
AMD Ryzen 5 Pro 2500u Firmware
AMD Ryzen 5 Pro 2500u
AMD Ryzen 5 2600h Firmware
AMD Ryzen 5 2600h
AMD Ryzen 7 2700u Firmware
AMD Ryzen 7 2700u
AMD Ryzen 7 Pro 2700u Firmware
AMD Ryzen 7 Pro 2700u
AMD Ryzen 7 2800h Firmware
AMD Ryzen 7 2800h
AMD Ryzen 3 3300g Firmware
AMD Ryzen 3 3300g
AMD Ryzen 3 3300x Firmware
AMD Ryzen 3 3300x
AMD Ryzen 3 3100 Firmware
AMD Ryzen 3 3100
AMD Ryzen 3 Pro 3300u Firmware
AMD Ryzen 3 Pro 3300u
AMD Ryzen 5 3400g Firmware
AMD Ryzen 5 3400g
AMD Ryzen 5 3450g Firmware
AMD Ryzen 5 3450g
AMD Ryzen 5 3600 Firmware
AMD Ryzen 5 3600
AMD Ryzen 5 3600x Firmware
AMD Ryzen 5 3600x
AMD Ryzen 5 Pro 3500u Firmware
AMD Ryzen 5 Pro 3500u
AMD Ryzen 7 3700x Firmware
AMD Ryzen 7 3700x
AMD Ryzen 7 3800x Firmware
AMD Ryzen 7 3800x
AMD Ryzen 7 Pro 3700u Firmware
AMD Ryzen 7 Pro 3700u
AMD Ryzen 9 5980hx Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 9 5980hx
AMD Ryzen 9 5980hs Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 9 5980hs
AMD Ryzen 7 5825u Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 7 5825u
AMD Ryzen 9 5900hx Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 9 5900hx
AMD Ryzen 9 5900hs Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 9 5900hs
AMD Ryzen 7 5825c Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 7 5825c
AMD Ryzen 7 5800h Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 7 5800h
AMD Ryzen 5 5625u Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 5 5625u
AMD Ryzen 7 5800hs Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 7 5800hs
AMD Ryzen 5 5625c Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 5 5625c
AMD Ryzen 5 5600h Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 5 5600h
AMD Ryzen 5 5600hs Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 5 5600hs
AMD Ryzen 7 5800u Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 7 5800u
AMD Ryzen 5 5600u Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 5 5600u
AMD Ryzen 5 5560u Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 5 5560u
AMD Ryzen 3 5425u Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 3 5425u
AMD Ryzen 3 5425c Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 3 5425c
AMD Ryzen 3 5400u Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 3 5400u
AMD Ryzen 3 5125c Firmware<cezannepi-fp6_1.0.0.9a
AMD Ryzen 3 5125c

Event History

May 11, 2022
CVE Published
via MITRE·04:18 PM
Data Sourced
via MITRE·04:18 PM
DescriptionWeakness
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of CVE-2021-26339?

CVE-2021-26339 is categorized as a potential denial of service vulnerability.

2

How do I fix CVE-2021-26339?

To fix CVE-2021-26339, update the affected AMD EPYC and Ryzen firmware to a version that includes the required patches.

3

Which systems are affected by CVE-2021-26339?

CVE-2021-26339 affects various firmware versions for AMD EPYC and Ryzen processors, particularly those before milanpi-sp3_1.0.0.7 and comboam4_v2_pi_1.2.0.6c.

4

Can CVE-2021-26339 be exploited remotely?

While CVE-2021-26339 requires specific conditions and an unprivileged VM, it poses a risk of denial of service if successfully exploited.

5

What are the implications of CVE-2021-26339?

The implications of CVE-2021-26339 include potential downtime and service disruption for systems using vulnerable AMD hardware.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203