Home/CVE/A bug in AMD CPU’s core logic may allow for an attacker, using specific code from an unprivileged VM, to trigger a CPU
CVE

CVE-2021-26339

A bug in AMD CPU’s core logic may allow for an attacker, using specific code from an unprivileged VM, to trigger a CPU

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.

MEDIUM · CVSS 5.5 EPSS 0.0009
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
▤

Affected Products & Versions

60
amd epyc 7763 firmware< milanpi-sp3_1.0.0.7
amd epyc 7713p firmware< milanpi-sp3_1.0.0.7
amd epyc 7713 firmware< milanpi-sp3_1.0.0.7
amd epyc 7663 firmware< milanpi-sp3_1.0.0.7
amd epyc 7643 firmware< milanpi-sp3_1.0.0.7
amd epyc 75f3 firmware< milanpi-sp3_1.0.0.7
amd epyc 7543p firmware< milanpi-sp3_1.0.0.7
amd epyc 7543 firmware< milanpi-sp3_1.0.0.7
▣

Scoring & Timeline

5.5
MEDIUM · CVSS v3.1 · psirt@amd.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD11 May 2022 · 05:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

30
suse-csafopenSUSE-SU-2025:14804-1
suse-csafopenSUSE-SU-2025:14769-1
suse-csafopenSUSE-SU-2025:14770-1
suse-csafopenSUSE-SU-2025:14771-1
suse-csafopenSUSE-SU-2025:14772-1
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028Vendor Advisory
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