This update for libvirt fixes the following issues :

  - CVE-2020-15708: Added a note to libvirtd.conf about     polkit auth in SUSE distros (bsc#1174955).

  - CVE-2020-25637: Fixed a double free in     qemuAgentGetInterfaces() (bsc#1177155).

  - qemu: Avoid stale capabilities cache host CPU or kernel     command line changes (bsc#1173157).

  - virdevmapper: Handle kernel without device-mapper     support (bsc#1175465).

  - Xen: Added support for passing arbitrary commands to the     qemu device model, similar to the xl.cfg(5)     device_model_args setting (bsc#1174139).

  - Xen: Don't add dom0 twice on driver reload     (bsc#1176430).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

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

  - A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, 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-2020-25637)

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

According to the version of the libvirt packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerability :

  - A double free memory issue was found to occur in the     libvirt API, in versions before 6.8.0, 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-2020-25637)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-202210-06 (libvirt: Multiple Vulnerabilities)

  - A flaw was found in libvirt, where it leaked a file descriptor for `/dev/mapper/control` into the QEMU     process. This file descriptor allows for privileged operations to happen against the device-mapper on the     host. This flaw allows a malicious guest user or process to perform operations outside of their standard     permissions, potentially causing serious damage to the host operating system. The highest threat from this     vulnerability is to confidentiality, integrity, as well as system availability. (CVE-2020-14339)

  - A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, 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-2020-25637)

  - A flaw was found in libvirt while it generates 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. The highest threat from this vulnerability is to confidentiality and integrity.
    (CVE-2021-3631)

  - An improper locking issue was found in the virStoragePoolLookupByTargetPath API of libvirt. 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. The highest threat from this vulnerability     is to system availability. (CVE-2021-3667)

  - 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-2022-0897)

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 Scientific Linux 7 host has packages installed that are affected by a vulnerability as referenced in the SLSA-2020:5040-1 advisory.

  - libvirt: double free in qemuAgentGetInterfaces() in qemu_agent.c (CVE-2020-25637)

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

A double free vulnerability was discovered in libvirt, a toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes).

For Debian 9 stretch, this problem has been fixed in version 3.0.0-4+deb9u5.

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

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:1762 advisory.

  - libvirt: double free in qemuAgentGetInterfaces() in qemu_agent.c (CVE-2020-25637)

  - QEMU: heap buffer overflow in iscsi_aio_ioctl_cb() in block/iscsi.c may lead to information disclosure     (CVE-2020-11947)

  - QEMU: reachable assertion failure in net_tx_pkt_add_raw_fragment() in hw/net/net_tx_pkt.c (CVE-2020-16092)

  - QEMU: assertion failure through usb_packet_unmap() in hw/usb/hcd-ehci.c (CVE-2020-25723)

  - QEMU: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c (CVE-2020-27821)

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

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
142183	openSUSE Security Update : libvirt (openSUSE-2020-1777)	Nessus	SuSE Local Security Checks	2020/11/2	2024/2/13	high
229911	Linux Distros Unpatched Vulnerability : CVE-2020-25637	Nessus	Misc.	2025/3/5	2026/8/6	medium
147562	EulerOS Virtualization 3.0.6.6 : libvirt (EulerOS-SA-2021-1456)	Nessus	Huawei Local Security Checks	2021/3/10	2024/1/10	medium
166166	GLSA-202210-06 : libvirt: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	2022/10/16	2023/10/9	high
160444	Ubuntu 18.04 LTS / 20.04 LTS : libvirt vulnerabilities (USN-5399-1)	Nessus	Ubuntu Local Security Checks	2022/5/2	2025/9/3	medium
142821	Scientific Linux Security Update : libvirt on SL7.x i686/x86_64 (2020:5040)	Nessus	Scientific Linux Local Security Checks	2020/11/12	2020/11/24	medium
141137	Debian DLA-2395-1 : libvirt security update	Nessus	Debian Local Security Checks	2020/10/5	2024/2/16	medium
149772	CentOS 8 : virt:rhel and virt-devel:rhel (CESA-2021:1762)	Nessus	CentOS Local Security Checks	2021/5/19	2025/9/24	medium

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