Xen Hypervisor PCI BAR I/O Port BUG Trigger Vulnerability
CVE-2026-79602 Published on September 8, 2026

x86: improper handling of HVM emulation return codes
A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen.

NVD

Vulnerability Analysis

CVE-2026-79602 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a Buffer Overflow Vulnerability?

The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.

CVE-2026-79602 has been classified to as a Buffer Overflow vulnerability or weakness.


Products Associated with CVE-2026-79602

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Citrix Xen Xen
 

Affected Versions

Xen Version consult Xen advisory XSA-510 is unknown by CVE-2026-79602