CVE-2021-28690: Xen

Medium severity, CVSS 6.5. EPSS: 1% chance of exploitation in the next 30 days.

x86: TSX Async Abort protections not restored after S3 This issue relates to the TSX Async Abort speculative security vulnerability. Please see https://xenbits.xen.org/xsa/advisory-305.html for details. Mitigating TAA by disabling TSX (the default and preferred option) requires selecting a non-default setting in MSR_TSX_CTRL. This setting isn't restored after S3 suspend.

Affected products

• Xen Xen: from 4.12, up to and including 4.15.0; version 4.15.0 only

Published 2021-06-29. Last modified 2026-06-17.