#VU63684 Input validation error in 3rd Gen AMD EPYC Processors - CVE-2021-26339
Published: May 25, 2022 / Updated: May 26, 2022
Vulnerability identifier: #VU63684
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-26339
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
3rd Gen AMD EPYC Processors
3rd Gen AMD EPYC Processors
Software vendor:
AMD
AMD
Description
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to an error in the AMD CPU’s core logic when using specific code from an unprivileged VM. A remote user with low-privileged access to guest OS can send a specific x86 instruction sequence that triggers CPU core hang.
Remediation
Install updates from vendor's website.