#VU63686 Resource management error in 1st Gen AMD EPYC Processors and 3rd Gen AMD EPYC Processors - CVE-2021-26342
Published: May 26, 2022
Vulnerability identifier: #VU63686
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-26342
CWE-ID: CWE-399
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
1st Gen AMD EPYC Processors
3rd Gen AMD EPYC Processors
1st Gen AMD EPYC Processors
3rd Gen AMD EPYC Processors
Software vendor:
AMD
AMD
Description
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to the CPU may fail to flush the Translation Lookaside Buffer (TLB) in SEV guest VMs. A local user can execute a particular sequence of operations that includes creation of a new virtual machine control block (VMCB) and disclose the SEV guest memory contents.
Remediation
Install updates from vendor's website.