CVE-2026-18917

Name	CVE-2026-18917
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1145069

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libvirt (PTS)	bookworm	9.0.0-4+deb12u2	vulnerable
	trixie	11.3.0-3+deb13u2	vulnerable
	forky	12.6.0-1	vulnerable
	sid	12.7.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libvirt	source	(unstable)	12.7.0-1			1145069

Notes

[trixie] - libvirt <no-dsa> (Minor issue)
[bookworm] - libvirt <postponed> (Minor issue)
https://gitlab.com/libvirt/libvirt/-/work_items/903
Introduced with: https://gitlab.com/libvirt/libvirt/-/commit/34f2d0319d2098c77c8cc27d8350616029125a2b (v1.2.6-rc1)
Fixed by: https://gitlab.com/libvirt/libvirt/-/commit/5a62cbf2907d4590283597b46da9c0f41e7b4d4f (v12.7.0-rc1)