CVE-2026-79608

This vulnerability affects Xen hypervisor versions 4.19.4 and onwards, 4.20.3 and onwards, 4.21.1 and onwards, and 4.22. The issue arises because a rework of the XSA-433 (Zenbleed, CVE-2023-20593) workaround introduced an inverted conditional , causing the fix to fail when needed and apply incorr...

CVE-2026-79608

The workaround for XSA-433 Zenbleed, CVE-2023-20593 was later re-worked to better integrate with other manipulations of the same MSR. In this rework an inverted conditional was introduced, resulting in the workaround to not be applied when needed and vice versa. For more details, see:...