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Ubuntu 24.04 LTS : libvirt vulnerabilities (USN-8831-1)

high Nessus Plugin ID 350949

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8831-1 advisory.

 It was discovered that libvirt had an integer overflow vulnerability in the NodeGetFreePages RPC handler.
 A local attacker could possibly use this issue to cause a denial of service or execute arbitrary code.
 (CVE-2026-18917)

 It was discovered that libvirt did not correctly handle symbolic links when changing ownership of the TPM emulator log file. A local attacker with access to the swtpm account could possibly use this issue to cause libvirt to change the ownership of an arbitrary file. (CVE-2026-77159)

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.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8831-1

Plugin Details

Severity: High

ID: 350949

File Name: ubuntu_USN-8831-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/29/2026

Updated: 9/29/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.19

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-77159

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-18917

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libnss-libvirt, p-cpe:/a:canonical:ubuntu_linux:libvirt-clients-qemu, p-cpe:/a:canonical:ubuntu_linux:libvirt-clients, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-config-network, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-config-nwfilter, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-driver-lxc, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-driver-qemu, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-driver-storage-gluster, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-driver-storage-iscsi-direct, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-driver-storage-rbd, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-driver-storage-zfs, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-driver-vbox, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-driver-xen, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-system-systemd, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-system-sysv, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon-system, p-cpe:/a:canonical:ubuntu_linux:libvirt-daemon, p-cpe:/a:canonical:ubuntu_linux:libvirt-l10n, p-cpe:/a:canonical:ubuntu_linux:libvirt-login-shell, p-cpe:/a:canonical:ubuntu_linux:libvirt-sanlock, p-cpe:/a:canonical:ubuntu_linux:libvirt-wireshark, p-cpe:/a:canonical:ubuntu_linux:libvirt0

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 9/28/2026

Vulnerability Publication Date: 8/20/2026

Reference Information

CVE: CVE-2026-18917, CVE-2026-77159

IAVA: 2026-A-0997

USN: 8831-1