CVE-2026-79608
Critical
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, 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
SeverityCritical
CVSS9.8
Exploit probability—
ProductXen
PublishedOct 13, 2026
First seenOct 13, 2026
Weakness typeCWE-670CWE-670
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| xen Xen | No range specified | — |
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