Affected: AlmaLinux:9: libvirt, AlmaLinux:9: libvirt-client, AlmaLinux:9: libvirt-client-qemu, AlmaLinux:9: libvirt-daemon, AlmaLinux:9: libvirt-daemon-common, AlmaLinux:9: libvirt-daemon-config-network, AlmaLinux:9: libvirt-daemon-config-nwfilter, AlmaLinux:9: libvirt-daemon-driver-interface, AlmaLinux:9: libvirt-daemon-driver-network, AlmaLinux:9: libvirt-daemon-driver-nodedev and 22 more

The libvirt library contains a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualized systems.

Security Fix(es):

* libvirt: swtpm privilege escalation via symlink following (CVE-2026-63622) * libvirt: Integer overflow in NodeGetFreePages RPC handler leading to heap buffer overflow (CVE-2026-18917)

Bug Fix(es) and Enhancement(s):

* Live migration fails when virtio-vga becomes available, video device switches from virtio-gpu-pci to virtio-vga on target [almalinux-9.8.z] (JIRA:AlmaLinux-186018) * libvirt-guests does not work together with virtlockd on shutdown [almalinux-9.8.z] (JIRA:AlmaLinux-224986) * Expose guest-get-devices in libvirt-api [almalinux-9.8.z] (JIRA:AlmaLinux-243306) * allow hyperv pvpanic "device" to process Windows crash dump [almalinux-9.8.z] (JIRA:AlmaLinux-242549)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Affected: Alpaquita:23: libvirt, Alpaquita:25: libvirt, Alpaquita:stream: libvirt

A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vulnerability in the NodeGetFreePages RPC handler. This flaw allows crafted values to bypass a size check, leading to an undersized memory buffer. Subsequently, real NUMA node data can overwrite this buffer. This heap buffer overflow can corrupt the root libvirt daemon's memory, potentially leading to a denial of service or local privilege escalation.

A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vulnerability in the NodeGetFreePages RPC handler. This flaw allows crafted values to bypass a size check, leading to an undersized memory buffer. Subsequently, real NUMA node data can overwrite this buffer. This heap buffer overflow can corrupt the root libvirt daemon's memory, potentially leading to a denial of service or local privilege escalation.

Affected: openEuler:20.03-LTS-SP4: libvirt

Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). The main package includes the libvirtd server exporting the virtualization support. Security Fix(es):

A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vulnerability in the NodeGetFreePages RPC handler. This flaw allows crafted values to bypass a size check, leading to an undersized memory buffer. Subsequently, real NUMA node data can overwrite this buffer. This heap buffer overflow can corrupt the root libvirt daemon's memory, potentially leading to a denial of service or local privilege escalation.(CVE-2026-18917)

An injection vulnerability was found in libvirt's virtual network driver. The network XML parser does not strip newline characters from DNS TXT record value attributes and SRV record domain/target attributes. These values are written verbatim into the dnsmasq configuration file generated by the network driver, allowing a user with permission to define virtual networks to inject arbitrary dnsmasq configuration directives such as dhcp-script, leading to arbitrary command execution as root.(CVE-2026-61477)

A flaw was found in libvirt. A local attacker, specifically a process running as the confined `swtpm` user, could exploit a symlink-following vulnerability in the `virFileChownFiles()` function. By planting a symbolic link within the `swtpm` state directory, the attacker could trick the root-l…

libvirt-12.6.0-2.1 on GA media

libvirt: Integer overflow in NodeGetFreePages RPC handler leading to heap buffer overflow

Affected: Rocky Linux:9: libvirt

The libvirt library contains a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualized systems.

Security Fix(es):

* libvirt: swtpm privilege escalation via symlink following (CVE-2026-63622)

* libvirt: Integer overflow in NodeGetFreePages RPC handler leading to heap buffer overflow (CVE-2026-18917)

Bug Fix(es) and Enhancement(s):

* Live migration fails when virtio-vga becomes available, video device switches from virtio-gpu-pci to virtio-vga on target [rhel-9.8.z] (JIRA:Rocky Linux-186018)

* libvirt-guests does not work together with virtlockd on shutdown [rhel-9.8.z] (JIRA:Rocky Linux-224986)

* Expose guest-get-devices in libvirt-api [rhel-9.8.z] (JIRA:Rocky Linux-243306)

* allow hyperv pvpanic "device" to process Windows crash dump [rhel-9.8.z] (JIRA:Rocky Linux-242549)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Security update for libvirt

Affected: Ubuntu:Pro:14.04:LTS: libvirt, Ubuntu:Pro:16.04:LTS: libvirt, Ubuntu:Pro:18.04:LTS: libvirt, Ubuntu:Pro:20.04:LTS: libvirt, Ubuntu:22.04:LTS: libvirt, Ubuntu:24.04:LTS: libvirt, Ubuntu:26.04:LTS: libvirt, Ubuntu:26.04:LTS: libvirt-hwe

A flaw was found in libvirt. An unprivileged local user could exploit an integer overflow vulnerability in the NodeGetFreePages RPC handler. This flaw allows crafted values to bypass a size check, leading to an undersized memory buffer. Subsequently, real NUMA node data can overwrite this buffer. This heap buffer overflow can corrupt the root libvirt daemon's memory, potentially leading to a denial of service or local privilege escalation.

Ein lokaler Angreifer kann eine Schwachstelle in libvirt ausnutzen, um einen Denial-of-Service-Zustand zu verursachen oder Berechtigungen zu erweitern.