CYBERSECURITYTRACKER
Vulnerabilities

CVE-2026-79609

Xen: Improper Access Control

What it is

Reported

XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown (CVE-2017-5754, one aspect of XSA-254). This involves copying 64-bit PV guest page table entries from guest-chosen root page tables to the Xen- chosen one which is in actual use by hardware. To read the guest root page table, the directmap is used. PV guests, however, have a directmap which may not cover all memory; in particular this is the case if any memory extends beyond the 5 TiB (CONFIG_BIGMEM=y: 3.5 TiB) address boundary.

Source reported · Source: CVE record · Complete source description.
Dates
Source last published: · Source last updated:

What is affected

Reported

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

Source reported · Source: CVE record
Dates
Source last published: · Source last updated:

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:

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: No action now. Remediate within standard update timelines. Monitor for change.

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…

Glossary

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