Certain instructions need intercepting and emulating by Xen. In some cases Xen emulates the instruction by replaying it, using an executable stub. Some instructions may raise an exception, which is supposed to be handled gracefully. Certain replayed instructions have additional logic to set up and recover the changes to the arithmetic flags. For replayed instructions where the flags recovery logic is used, the metadata for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating it as fatal instead.

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

  - Certain instructions need intercepting and emulating by Xen. In some cases Xen emulates the instruction by     replaying it, using an executable stub. Some instructions may raise an exception, which is supposed to be     handled gracefully. Certain replayed instructions have additional logic to set up and recover the changes     to the arithmetic flags. For replayed instructions where the flags recovery logic is used, the metadata     for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating     it as fatal instead. (CVE-2025-27465)

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

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-d2a821d9d1 advisory.

    update to xen-4.19.3     includes patches for     x86: Incorrect stubs exception handling for flags recovery [XSA-470,     CVE-2025-27465]     x86: Transitive Scheduler Attacks [XSA-471, CVE-2024-36350,

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 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-ddaa63a0f5 advisory.

    update to xen-4.19.3     includes patches for     x86: Incorrect stubs exception handling for flags recovery [XSA-470,     CVE-2025-27465]     x86: Transitive Scheduler Attacks [XSA-471, CVE-2024-36350,     CVE-2024-36357]

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 SUSE Linux SLES12 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2025:02471-1 advisory.

    - CVE-2025-27465: Fixed incorrect stubs exception handling for flags recovery (XSA-470) (bsc#1244644)
    - Fixed more AMD transient execution attacks (XSA-471) (bsc#1246112)

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

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

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - A transient execution vulnerability in some AMD processors may allow an attacker to infer data from
    previous stores, potentially resulting in the leakage of privileged information. (CVE-2024-36350)

  - A transient execution vulnerability in some AMD processors may allow an attacker to infer data in the L1D
    cache, potentially resulting in the leakage of sensitive information across privileged boundaries.
    (CVE-2024-36357)

  - Certain instructions need intercepting and emulating by Xen. In some cases Xen emulates the instruction by
    replaying it, using an executable stub. Some instructions may raise an exception, which is supposed to be
    handled gracefully. Certain replayed instructions have additional logic to set up and recover the changes
    to the arithmetic flags. For replayed instructions where the flags recovery logic is used, the metadata
    for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating
    it as fatal instead. (CVE-2025-27465)

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02325-1 advisory.

    - CVE-2024-36350, CVE-2024-36357: More AMD transient execution attacks (bsc#1246112, XSA-471)
    - CVE-2025-27465: Incorrect stubs exception handling for flags recovery (bsc#1244644, XSA-470)

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02326-1 advisory.

    Security fixes:

    - CVE-2024-28956: Fixed Intel CPU: Indirect Target Selection (ITS) (XSA-469) (bsc#1243117)
    - CVE-2024-53241: Fixed Xen hypercall page unsafe against speculative attacks (XSA-466) (bsc#1234282)
    - CVE-2025-1713: Fixed deadlock potential with VT-d and legacy PCI device pass-through (XSA-467)     (bsc#1238043)
    - CVE-2024-36350, CVE-2024-36357: More AMD transient execution attacks (bsc#1246112, XSA-471)
    - CVE-2025-27465: Incorrect stubs exception handling for flags recovery (bsc#1244644, XSA-470)

    Other fixes:

    - Upstream bug fixes (bsc#1027519)

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02319-1 advisory.

    - CVE-2024-36350, CVE-2024-36357: More AMD transient execution attacks (bsc#1246112, XSA-471)
    - CVE-2025-27465: Incorrect stubs exception handling for flags recovery (bsc#1244644, XSA-470)

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02316-1 advisory.

    - CVE-2024-36350, CVE-2024-36357: More AMD transient execution attacks (bsc#1246112, XSA-471)
    - CVE-2025-27465: Incorrect stubs exception handling for flags recovery (bsc#1244644, XSA-470)

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:02315-1 advisory.

    - Update to Xen 4.20.1
    - CVE-2024-36350, CVE-2024-36357: More AMD transient execution attacks (bsc#1246112, XSA-471)
    - CVE-2025-27465: Incorrect stubs exception handling for flags recovery (bsc#1244644, XSA-470)

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

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

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a DoS vulnerability where An unprivileged guest can cause a hypervisor crash, causing a Denial of Service (DoS) of the entire host.

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

ID	Name	Product	Family	Severity
277079	Debian dsa-6068 : libxen-dev - security update	Nessus	Debian Local Security Checks	medium
253424	Linux Distros Unpatched Vulnerability : CVE-2025-27465	Nessus	Misc.	medium
246917	Fedora 41 : xen (2025-d2a821d9d1)	Nessus	Fedora Local Security Checks	medium
245578	Fedora 42 : xen (2025-ddaa63a0f5)	Nessus	Fedora Local Security Checks	medium
242655	SUSE SLES12: xen / xen-devel / xen-doc-html / xen-libs / xen-libs-32bit / etc (SUSE-SU-2025:02471-1)	Nessus	SuSE Local Security Checks	medium
428617	Alpine: multiple xen packages: security update to 4.19.2-r2	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
428617	Alpine: multiple xen packages: security update to 4.19.2-r2	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
428616	Alpine: multiple xen packages: security update to 4.18.5-r1	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
428616	Alpine: multiple xen packages: security update to 4.18.5-r1	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
242225	SUSE SLES15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2025:02325-1)	Nessus	SuSE Local Security Checks	medium
242214	SUSE SLES15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2025:02326-1)	Nessus	SuSE Local Security Checks	medium
242155	SUSE SLES15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2025:02319-1)	Nessus	SuSE Local Security Checks	medium
242153	SUSE SLED15: xen / xen-devel / xen-doc-html / xen-libs / xen-libs-32bit / etc (SUSE-SU-2025:02316-1)	Nessus	SuSE Local Security Checks	medium
242152	SUSE SLED15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2025:02315-1)	Nessus	SuSE Local Security Checks	medium
428358	Alpine: multiple xen packages: security update to 4.20.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
428358	Alpine: multiple xen packages: security update to 4.20.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
241980	Citrix XenServer DOS (XSA-470)	Nessus	Misc.	high

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