Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as intended when support for HVM guests is compiled out of Xen.

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

  - Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as     intended when support for HVM guests is compiled out of Xen. (CVE-2023-46840)

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

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-2024:0830-1 advisory.

    - CVE-2023-46839: Fixed memory access through PCI device with phantom functions (XSA-449) (bsc#1218851).
    - CVE-2023-46840: Fixed Failure to quarantine devices in !HVM builds (XSA-450) (bsc#1219080).
    - CVE-2023-46841: Fixed shadow stack vs exceptions from emulation stubs (XSA-451) (bsc#1219885).

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 Fedora 38 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-4b2cf8c375 advisory.

    arm32: The cache may not be properly cleaned/invalidated (take two)     [XSA-447, CVE-2023-46837]     pci: phantom functions assigned to incorrect contexts [XSA-449,     CVE-2023-46839]     VT-d: Failure to quarantine devices in !HVM build [XSA-450,     CVE-2023-46840]

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-e527e6fd08 advisory.

    arm32: The cache may not be properly cleaned/invalidated (take two)     [XSA-447, CVE-2023-46837]     pci: phantom functions assigned to incorrect contexts [XSA-449,     CVE-2023-46839]     VT-d: Failure to quarantine devices in !HVM build [XSA-450,     CVE-2023-46840]

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-2024:0266-1 advisory.

    - CVE-2023-46839: Fixed phantom functions assigned to incorrect contexts (XSA-449) (bsc#1218851)
    - CVE-2023-46840: Fixed VT-d: Failure to quarantine devices in !HVM builds (XSA-450) (bsc#1219080)

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.

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

  - An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux
    kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped.
    However, the handler may not have time to run if the frontend quickly toggles between the states connect
    and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving
    guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege
    escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.
    (CVE-2020-29569)

  - An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are
    processing watch events using a single thread. If the events are received faster than the thread is able
    to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the
    backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable. (CVE-2020-29568)

ID	Name	Product	Family	Severity
258494	Linux Distros Unpatched Vulnerability : CVE-2023-46840	Nessus	Misc.	medium
207559	GLSA-202409-10 : Xen: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	high
191896	SUSE SLED15: xen / xen-devel / xen-doc-html / xen-libs / xen-libs-32bit / etc (SUSE-SU-2024:0830-1)	Nessus	SuSE Local Security Checks	medium
190571	Fedora 38 : xen (2024-4b2cf8c375)	Nessus	Fedora Local Security Checks	low
190566	Fedora 39 : xen (2024-e527e6fd08)	Nessus	Fedora Local Security Checks	low
189835	SUSE SLED15: xen / xen-devel / xen-doc-html / xen-libs / xen-libs-32bit / etc (SUSE-SU-2024:0266-1)	Nessus	SuSE Local Security Checks	medium
407730	Alpine: xen: security update to 0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
407730	Alpine: xen: security update to 0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high

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CVE-2023-46840

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