CVE-2026-63623 Libvirt: information disclosure via world-readable storage volume images during clone/convert
Local attackers can read sensitive guest disk data during storage clone or convert operations due to world-readable file permissions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63623?
CVE-2026-63623 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in libvirt. During storage volume clone or convert operations, newly created volume images were temporarily world-readable. This was caused by the `qemu-img` utility running with overly permissive file creation settings, allowing any local user to read the full guest disk contents. This vulnerability could lead to sensitive information disclosure from guest virtual machines.
Weakness: CWE-732
Which versions are affected by CVE-2026-63623?
How do I fix CVE-2026-63623?
Apply the vendor's patch.
Is CVE-2026-63623 being exploited?
There is no known exploitation of CVE-2026-63623 in the wild and no public exploit code.
Sources
Also known as AZL-95613, DEBIAN-CVE-2026-63623, GHSA-m7jx-933m-5cqr, OESA-2026-3831, OESA-2026-3833, OESA-2026-3834 and 2 more.