Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and other modes. This in particular means that they may set registers used to pass 32-bit-mode hypercall arguments to values outside of the range 32-bit code would be able to set them to. When processing of hypercalls takes a considerable amount of time, the hypervisor may choose to invoke a hypercall continuation. Doing so involves putting (perhaps updated) hypercall arguments in respective registers. For guests not running in 64-bit mode this further involves a certain amount of translation of the values. Unfortunately internal sanity checking of these translated values assumes high halves of registers to always be clear when invoking a hypercall. When this is found not to be the case, it triggers a consistency check in the hypervisor and causes a crash.

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

  - Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and other modes. This in particular     means that they may set registers used to pass 32-bit-mode hypercall arguments to values outside of the     range 32-bit code would be able to set them to. When processing of hypercalls takes a considerable amount     of time, the hypervisor may choose to invoke a hypercall continuation. Doing so involves putting (perhaps     updated) hypercall arguments in respective registers. For guests not running in 64-bit mode this further     involves a certain amount of translation of the values. Unfortunately internal sanity checking of these     translated values assumes high halves of registers to always be clear when invoking a hypercall. When this     is found not to be the case, it triggers a consistency check in the hypervisor and causes a crash.
    (CVE-2023-46842)

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

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5836 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-5836-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     December 26, 2024                     https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : xen     CVE ID         : CVE-2023-28746 CVE-2023-46841 CVE-2023-46842 CVE-2024-2193                      CVE-2024-2201 CVE-2024-31142 CVE-2024-31143 CVE-2024-31145                      CVE-2024-31146 CVE-2024-45817 CVE-2024-45818 CVE-2024-45819

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

    For the stable distribution (bookworm), these problems have been fixed in     version 4.17.5+23-ga4e5191dc0-1.

    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 host is affected by the vulnerability described in GLSA-202409-10 (Xen: Multiple Vulnerabilities)

    Multiple vulnerabilities have been discovered in Xen. Please review the CVE identifiers referenced below     for details.

Tenable has extracted the preceding description block directly from the Gentoo Linux 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-2024:2654-1 advisory.

    - CVE-2023-46842: Fixed x86 HVM hypercalls may trigger Xen bug check (XSA-454, bsc#1221984).
    - CVE-2024-31143: Fixed double unlock in x86 guest IRQ handling (XSA-458, bsc#1227355).

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-2024:2535-1 advisory.

    - CVE-2023-28746: Register File Data Sampling (XSA-452, bsc#1221332)
    - CVE-2023-46842: HVM hypercalls may trigger Xen bug check (XSA-454, bsc#1221984)
    - CVE-2024-2193: Fixed GhostRace, a speculative race conditions. (XSA-453, bsc#1221334)
    - CVE-2024-2201: Mitigation for Native Branch History Injection (XSA-456, bsc#1222453)
    - CVE-2024-31142: Fixed incorrect logic for BTC/SRSO mitigations (XSA-455, bsc#1222302)
    - CVE-2024-31143: Fixed double unlock in x86 guest IRQ handling (XSA-458, bsc#1227355)

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-2024:2531-1 advisory.

    - CVE-2023-46842: Fixed x86 HVM hypercalls may trigger Xen bug check (XSA-454, bsc#1221984).
    - CVE-2024-31143: Fixed double unlock in x86 guest IRQ handling (XSA-458, bsc#1227355).

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 SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:1541-1 advisory.

  - x86: Native Branch History Injection [XSA-456, CVE-2024-2201] update to xen 4.17.4, remove patches now     included upstream rebase xen.gcc12.fixes.patch x86 HVM hypercalls may trigger Xen bug check [XSA-454,     CVE-2023-46842] x86: Incorrect logic for BTC/SRSO mitigations [XSA-455, CVE-2024-31142] (CVE-2023-46842,     CVE-2024-31142)

  - This CVE was assigned by Intel. Please see CVE-2024-2201 on CVE.org for more information. (CVE-2024-2201)

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 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-a46df5ba2f advisory.

    x86: Native Branch History Injection [XSA-456, CVE-2024-2201]     update to xen 4.18.2, remove patches now included upstream     x86 HVM hypercalls may trigger Xen bug check [XSA-454, CVE-2023-46842]     x86: Incorrect logic for BTC/SRSO mitigations [XSA-455, CVE-2024-31142]

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 38 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-a676697123 advisory.

    x86: Native Branch History Injection [XSA-456, CVE-2024-2201]     update to xen 4.17.4, remove patches now included upstream     rebase xen.gcc12.fixes.patch     x86 HVM hypercalls may trigger Xen bug check [XSA-454, CVE-2023-46842]     x86: Incorrect logic for BTC/SRSO mitigations [XSA-455, CVE-2024-31142]

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 39 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-4357ec611d advisory.

    x86: Native Branch History Injection [XSA-456, CVE-2024-2201]     update to xen 4.17.4, remove patches now included upstream     rebase xen.gcc12.fixes.patch     x86 HVM hypercalls may trigger Xen bug check [XSA-454, CVE-2023-46842]     x86: Incorrect logic for BTC/SRSO mitigations [XSA-455, CVE-2024-31142]

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 SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:1295-1 advisory.

  - This CVE was assigned by Intel. Please see CVE-2024-2201 on CVE.org for more information. (CVE-2024-2201)

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

ID	Name	Product	Family	Severity
226197	Linux Distros Unpatched Vulnerability : CVE-2023-46842	Nessus	Misc.	medium
213392	Debian dsa-5836 : libxen-dev - security update	Nessus	Debian Local Security Checks	high
207559	GLSA-202409-10 : Xen: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	high
204881	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : xen (SUSE-SU-2024:2654-1)	Nessus	SuSE Local Security Checks	high
202566	SUSE SLES15 Security Update : xen (SUSE-SU-2024:2535-1)	Nessus	SuSE Local Security Checks	high
202564	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : xen (SUSE-SU-2024:2531-1)	Nessus	SuSE Local Security Checks	high
195153	SUSE SLES12 Security Update : xen (SUSE-SU-2024:1541-1)	Nessus	SuSE Local Security Checks	high
194672	Fedora 40 : xen (2024-a46df5ba2f)	Nessus	Fedora Local Security Checks	high
193901	Fedora 38 : xen (2024-a676697123)	Nessus	Fedora Local Security Checks	high
193861	Fedora 39 : xen (2024-4357ec611d)	Nessus	Fedora Local Security Checks	high
193352	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : xen (SUSE-SU-2024:1295-1)	Nessus	SuSE Local Security Checks	high

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CVE-2023-46842

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