Xen Security Advisory 515 v2 (CVE-2026-79608) - x86/AMD: ineffectual Zenbleed workaround

Summary by Cyber Security News13 Oct 2026, 14:54 CET

About this summary. This is a short excerpt from the description that oss-security published with its article. Cyber Security News did not report or verify the underlying story. Read the original: https://seclists.org/oss-sec/2026/q4/143

Posted by Xen . org security team on Oct 13 Xen Security Advisory CVE-2026-79608 / XSA-515 version 2 x86/AMD: ineffectual Zenbleed workaround UPDATES IN VERSION 2 Public release. ISSUE DESCRIPTION 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,...

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