In SEV guest VMs, the CPU may fail to flush the Translation Lookaside Buffer (TLB) following a particular sequence of operations that includes creation of a new virtual machine control block (VMCB). The failure to flush the TLB may cause the microcode to use stale TLB translations which may allow for disclosure of SEV guest memory contents. Users of SEV-ES/SEV-SNP guest VMs are not impacted by this vulnerability.

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Advisories
Source ID Title
EUVD EUVD EUVD-2021-13148 In SEV guest VMs, the CPU may fail to flush the Translation Lookaside Buffer (TLB) following a particular sequence of operations that includes creation of a new virtual machine control block (VMCB). The failure to flush the TLB may cause the microcode to use stale TLB translations which may allow for disclosure of SEV guest memory contents. Users of SEV-ES/SEV-SNP guest VMs are not impacted by this vulnerability.
Fixes

Solution

No solution given by the vendor.


Workaround

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cve-icon MITRE

Status: PUBLISHED

Assigner: AMD

Published:

Updated: 2024-09-16T16:32:42.078Z

Reserved: 2021-01-29T00:00:00

Link: CVE-2021-26342

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2022-05-11T17:15:08.297

Modified: 2024-11-21T05:56:09.363

Link: CVE-2021-26342

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses