UBUNTU-CVE-2026-79602

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    UBUNTU-CVE-2026-79602

    Published: 8 Sept 2026Last Modified: 9 Sept 2026
    Upstream:
    CVE-2026-79602

    Summary:

    Details: 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. A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen. Xen versions 4.6 and later are vulnerable. This is known to be the case with the fix for XSA-491, but it's possible the issue can also be triggered from other, non-analyzed paths. Only x86 systems are vulnerable. Arm systems are not vulnerable. Only HVM guests with a PCI device with IO BARs assigned can leverage the vulnerability.

    References: https://ubuntu.com/security/CVE-2026-79602, https://www.cve.org/CVERecord?id=CVE-2026-79602

    Affected packages

    Package

    Name: xen

    Purl: pkg:deb/ubuntu/xen?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.5.1-0ubuntu1
    4.5.1-0ubuntu2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2026-79602 | CVE-DB