Source: libvirt
Version: 12.6.0-1
Severity: important
Tags: security upstream
Forwarded: https://gitlab.com/libvirt/libvirt/-/work_items/903
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>
Control: found -1 11.3.0-3+deb13u2
Control: found -1 11.3.0-3
Control: found -1 1.2.6-1

Hi,

The following vulnerability was published for libvirt.

CVE-2026-18917[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-18917
https://www.cve.org/CVERecord?id=CVE-2026-18917
[1] https://gitlab.com/libvirt/libvirt/-/work_items/903

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore