When passing through PCI devices, the detach logic in libxl won't remove access permissions to any 64bit memory BARs the device might have. As a result a domain can still have access any 64bit memory BAR when such device is no longer assigned to the domain. For PV domains the permission leak allows the domain itself to map the memory in the page-tables. For HVM it would require a compromised device model or stubdomain to map the leaked memory into the HVM domain p2m.

The remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6068 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6068-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     December 02, 2025                     https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : xen     CVE ID         : CVE-2024-28956 CVE-2024-36350 CVE-2024-36357                      CVE-2025-27465 CVE-2025-27466 CVE-2025-58142                      CVE-2025-58143 CVE-2025-58144 CVE-2025-58145                      CVE-2025-58147 CVE-2025-58148 CVE-2025-58149                      CVE-2025-1713

    Multiple vulnerabilities have been discovered in the Xen hypervisor,     which could result in memory disclosure, denial of service or     privilege escalation.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 4.17.5+72-g01140da4e8-1.

    For the stable distribution (trixie), these problems have been fixed in     version 4.20.2+7-g1badcf5035-0+deb13u1.

    We recommend that you upgrade your xen packages.

    For the detailed security status of xen please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/xen

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-ec271ef07b advisory.

    Incorrect removal of permissions on PCI device unplug [XSA-476,     CVE-2025-58149]

    ----

    x86: Incorrect input sanitisation in Viridian hypercalls [XSA-475,     CVE-2025-58147, CVE-2025-58148]

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-48dc1c8c79 advisory.

    Incorrect removal of permissions on PCI device unplug [XSA-476,     CVE-2025-58149]

    ----

    x86: Incorrect input sanitisation in Viridian hypercalls [XSA-475,     CVE-2025-58147, CVE-2025-58148]

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-22fd93478b advisory.

    Incorrect removal of permissions on PCI device unplug [XSA-476,     CVE-2025-58149]

    ----

    x86: Incorrect input sanitisation in Viridian hypercalls [XSA-475,     CVE-2025-58147, CVE-2025-58148]

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - When passing through PCI devices, the detach logic in libxl won't remove access permissions to any 64bit     memory BARs the device might have. As a result a domain can still have access any 64bit memory BAR when     such device is no longer assigned to the domain. For PV domains the permission leak allows the domain     itself to map the memory in the page-tables. For HVM it would require a compromised device model or     stubdomain to map the leaked memory into the HVM domain p2m. (CVE-2025-58149)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
277079	Debian dsa-6068 : libxen-dev - security update	Nessus	Debian Local Security Checks	medium
274555	Fedora 42 : xen (2025-ec271ef07b)	Nessus	Fedora Local Security Checks	high
274462	Fedora 41 : xen (2025-48dc1c8c79)	Nessus	Fedora Local Security Checks	high
271788	Fedora 43 : xen (2025-22fd93478b)	Nessus	Fedora Local Security Checks	medium
271710	Linux Distros Unpatched Vulnerability : CVE-2025-58149	Nessus	Misc.	high

Detections

Analytics

CVE-2025-58149

high

Tenable Plugins

medium

high

high

medium

high