CVE-2026-79608

UNKNOWN 0.0

x86/AMD: ineffectual Zenbleed workaround

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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

Vendor	xen
Product	xen
Published	Oct 13, 2026
Last Updated	Oct 13, 2026

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Affected Versions

Xen / Xen

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

xenbits.xenproject.org: https://xenbits.xenproject.org/xsa/advisory-515.html xenbits.xen.org: http://xenbits.xen.org/xsa/advisory-515.html

Credits

This issue was discovered by Sashiko + Opus 5.0 and diagnosed as a security issue by George Dunlap.