Bug 2550657 (CVE-2026-79608) - CVE-2026-79608 xen: xen: Information disclosure via inverted conditional in Zenbleed workaround
Summary: CVE-2026-79608 xen: xen: Information disclosure via inverted conditional in Z...
Keywords:
Status: NEW
Alias: CVE-2026-79608
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2559179
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-13 15:54 UTC by OSIDB Bzimport
Modified: 2026-10-22 17:14 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-10-13 15:54:29 UTC 
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:
  http://xenbits.xen.org/xsa/advisory-433.html
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