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Medium severity · published May 11, 2022
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 core hang resulting in a potential denial of service
5.5
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
E7
Epyc 72f3 Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 7313 Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 7313p Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 7343 Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 7373x Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 73f3 Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 7413 Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 7443 Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 7443p Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 7453 Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 7473x Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
E7
Epyc 74f3 Firmware · Amd
before milanpi-sp3_1.0.0.7 · source: NVD
Affected product
E7
Epyc 72f3 Firmware
Amd
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26339
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-26339
Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027
Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028
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