The remote SUSE Linux SUSE15 host has packages installed that are affected by a vulnerability as referenced in the openSUSE-SU-2022:0021-1 advisory.

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

Note that Nessus has not tested for this issue 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-2022:0031-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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 SLED12 / SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:0032-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5399-1 advisory.

    It was discovered that libvirt incorrectly handled certain locking operations. A local attacker could     possibly use this issue to cause libvirt to stop accepting connections, resulting in a denial of service.
    This issue only affected Ubuntu 20.04 LTS. (CVE-2021-3667)

    It was discovered that libvirt incorrectly handled threads during shutdown. A local attacker could     possibly use this issue to cause libvirt to crash, resulting in a denial of service. This issue only     affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-3975)

    It was discovered that libvirt incorrectly handled the libxl driver. An attacker inside a guest could     possibly use this issue to cause libvirtd to crash or stop responding, resulting in a denial of service.
    This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 21.10. (CVE-2021-4147)

    It was discovered that libvirt incorrectly handled the nwfilter driver. A local attacker could possibly     use this issue to cause libvirt to crash, resulting in a denial of service. (CVE-2022-0897)

    It was discovered that libvirt incorrectly handled the polkit access control driver. A local attacker     could possibly use this issue to cause libvirt to crash, resulting in a denial of service. This issue only     affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-25637)

    It was discovered that libvirt incorrectly generated SELinux labels. In environments using SELinux, this     issue could allow the sVirt confinement to be bypassed. This issue only affected Ubuntu 18.04 LTS and     Ubuntu 20.04 LTS. (CVE-2021-3631)

Tenable has extracted the preceding description block directly from the Ubuntu 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-2022:0041-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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-2022:0128-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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.

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3778 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3778-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     April 01, 2024                                https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : libvirt     Version        : 5.0.0-4+deb10u2     CVE ID         : CVE-2020-10703 CVE-2020-12430 CVE-2020-25637 CVE-2021-3631                      CVE-2021-3667 CVE-2021-3975 CVE-2021-4147 CVE-2022-0897                      CVE-2024-1441 CVE-2024-2494 CVE-2024-2496     Debian Bug     : 959447 971555 990709 991594 1002535 1009075 1066058 1067461

    Multiple vulnerabilities were found in libvirt, a C toolkit to interact     with the virtualization capabilities of Linux, which could lead to     denial of service or information disclosure.

    CVE-2020-10703

        A NULL pointer dereference was found in the libvirt API that is responsible for         fetching a storage pool based on its target path.  In more detail, this flaw affects         storage pools created without a target path such as network-based pools like gluster         and RBD.  Unprivileged users with a read-only connection could abuse this flaw to         crash the libvirt daemon, resulting in a potential denial of service.

    CVE-2020-12430

        A memory leak was found in the virDomainListGetStats libvirt API that is responsible         for retrieving domain statistics when managing QEMU guests.  This flaw allows         unprivileged users with a read-only connection to cause a memory leak in the domstats         command, resulting in a potential denial of service.

    CVE-2020-25637

        A double free memory issue was found in the libvirt API that is responsible for         requesting information about network interfaces of a running QEMU domain.  This flaw         affects the polkit access control driver.  Specifically, clients connecting to the         read-write socket with limited ACL permissions could use this flaw to crash the         libvirt daemon, resulting in a denial of service, or potentially escalate their         privileges on the system.  The highest threat from this vulnerability is to data         confidentiality and integrity as well as system availability.

    CVE-2021-3631

        An issue was found in the generation of SELinux MCS category pairs for VMs' dynamic         labels.  This flaw allows one exploited guest to access files labeled for another         guest, resulting in the breaking out of sVirt confinement.

    CVE-2021-3667

        An improper locking issue was found in the virStoragePoolLookupByTargetPath API.  It         occurs in the storagePoolLookupByTargetPath function where a locked virStoragePoolObj         object is not properly released on ACL permission failure.  Clients connecting to the         read-write socket with limited ACL permissions could use this flaw to acquire the lock         and prevent other users from accessing storage pool/volume APIs, resulting in a denial         of service condition.

    CVE-2021-3975

        A use-after-free issue was found in libvirt in qemuProcessHandleMonitorEOF(), where         the qemuMonitorUnregister() function is called using multiple threads without being         adequately protected by a monitor lock.  This flaw could be triggered by the         virConnectGetAllDomainStats API when the guest is shutting down.  An unprivileged         client with a read-only connection could use this flaw to perform a denial of service         attack by causing the libvirt daemon to crash.

    CVE-2021-4147

        Jim Fehlig discovered that a malicious guest using the libxl driver could cause         libvirtd on the host to deadlock or crash when continuously rebooting itself.

    CVE-2022-0897

        A flaw was found in the libvirt nwfilter driver.  The virNWFilterObjListNumOfNWFilters         method failed to acquire the driver->nwfilters mutex before iterating over         virNWFilterObj instances.  There was no protection to stop another thread from         concurrently modifying the driver->nwfilters object.  This flaw allows a malicious,         unprivileged user to exploit this issue via libvirt's API virConnectNumOfNWFilters to         crash the network filter management daemon (libvirtd/virtnwfilterd).

    CVE-2024-1441

        An off-by-one error flaw was found in the udevListInterfacesByStatus() function in         libvirt when the number of interfaces exceeds the size of the `names` array.  This         issue can be reproduced by sending specially crafted data to the libvirt daemon,         allowing an unprivileged client to perform a denial of service attack by causing the         libvirt daemon to crash.

    CVE-2024-2494

        The ALT Linux Team discovered that the RPC server deserialization code allocates         memory for arrays before the non-negative length check is performed by the C API entry         points.  Passing a negative length therefore results in a crash due to the negative         length being treated as a huge positive number.  This flaw allows a local,         unprivileged user to perform a denial of service attack by causing the libvirt daemon         to crash.

    CVE-2024-2496

        A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces()         function.  This issue can occur when detaching a host interface while at the same time         collecting the list of interfaces via virConnectListAllInterfaces API.  This flaw         could be used to perform a denial of service attack by causing the libvirt daemon to         crash.

    For Debian 10 buster, these problems have been fixed in version     5.0.0-4+deb10u2.

    We recommend that you upgrade your libvirt packages.

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

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

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 SUSE Linux SLED15 / SLES15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:0021-1 advisory.

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

Note that Nessus has not tested for this issue 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-2022:0042-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:0045-2 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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-2022:0045-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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

An update of the libvirt package has been released.

ID	Name	Product	Family	Published	Updated	Severity
156467	openSUSE 15 Security Update : libvirt (openSUSE-SU-2022:0021-1)	Nessus	SuSE Local Security Checks	1/5/2022	4/26/2022	medium
156475	SUSE SLES15 Security Update : libvirt (SUSE-SU-2022:0031-1)	Nessus	SuSE Local Security Checks	1/5/2022	7/14/2023	medium
156479	SUSE SLED12 / SLES12 Security Update : libvirt (SUSE-SU-2022:0032-1)	Nessus	SuSE Local Security Checks	1/6/2022	7/14/2023	medium
160444	Ubuntu 18.04 LTS / 20.04 LTS : libvirt vulnerabilities (USN-5399-1)	Nessus	Ubuntu Local Security Checks	5/2/2022	9/3/2025	medium
156607	SUSE SLES12 Security Update : libvirt (SUSE-SU-2022:0041-1)	Nessus	SuSE Local Security Checks	1/11/2022	7/14/2023	medium
156881	SUSE SLES15 Security Update : libvirt (SUSE-SU-2022:0128-1)	Nessus	SuSE Local Security Checks	1/20/2022	7/14/2023	medium
253270	Linux Distros Unpatched Vulnerability : CVE-2021-4147	Nessus	Misc.	8/21/2025	8/21/2025	medium
192736	Debian dla-3778 : libnss-libvirt - security update	Nessus	Debian Local Security Checks	4/1/2024	5/16/2025	medium
156468	SUSE SLED15 / SLES15 Security Update : libvirt (SUSE-SU-2022:0021-1)	Nessus	SuSE Local Security Checks	1/5/2022	7/14/2023	medium
156615	SUSE SLES12 Security Update : libvirt (SUSE-SU-2022:0042-1)	Nessus	SuSE Local Security Checks	1/11/2022	7/14/2023	medium
158146	SUSE SLES15 Security Update : libvirt (SUSE-SU-2022:0045-2)	Nessus	SuSE Local Security Checks	2/18/2022	7/13/2023	medium
156634	SUSE SLES15 Security Update : libvirt (SUSE-SU-2022:0045-1)	Nessus	SuSE Local Security Checks	1/12/2022	7/14/2023	medium
204362	Photon OS 4.0: Libvirt PHSA-2023-4.0-0469	Nessus	PhotonOS Local Security Checks	7/24/2024	7/24/2024	medium

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