Vulnerabilities

CVE-2026-79608

Xen: CWE-670

Track*
CVSS 9.8 Critical

What it is

Reported

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

Source reported · Source: NVD · Complete source description.

Dates

Source last published: 2026-10-13 20:17 UTC · Source last updated: 2026-10-29 05:28 UTC

What is affected

Reported

Xen; Xen. Product-level identification only; no affected-version conclusion is available from this field.

Source reported · Source: NVD

Dates

Source last published: 2026-10-13 20:17 UTC · Source last updated: 2026-10-29 05:28 UTC

Urgency and basis

Tracker computed

Track*

Current priority score and EPSS: loading from the tracker record. They are read when this page loads and are not shown without JavaScript. They change daily and are not part of "Source last updated".

Tracker decision tier from the evidence detailed below

Dates

Source last updated: 2026-10-29 05:28 UTC

Exploitation evidence

Not reported

Not reported by tracked sources.

What to do

Not reported

Not reported by tracked sources.

Tracker inference. Guidance from the decision tier: Monitor more closely. May require action sooner than standard timelines.

Detection and validation

Mapped metadata availability only. These signals do not change priority.

Sigma, Atomic, Nuclei, and Metasploit: none mapped by tracked sources.

Sigma
Not mapped by tracked sources.
Atomic
Not mapped by tracked sources.
Nuclei
Not mapped by tracked sources.
Metasploit
Not mapped by tracked sources.

Evidence detail

Loading the full tracker evidence record…