Vulnerability · Published Aug 10, 2026 · Assigned by redhat
CVE-2026-63623Libvirt: information disclosure via world-readable storage volume images during clone/convert
Medium 5.5
In plain English
A medium-severity incorrect permission assignment in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libvirt | no fix listed | DEBIAN-CVE-2026-63623 |
| Debian:13 | libvirt | 11.3.0-3+deb13u3 | DEBIAN-CVE-2026-63623 |
| Debian:14 | libvirt | 12.6.0-1 | DEBIAN-CVE-2026-63623 |
| Ubuntu:22.04:LTS | libvirt | 8.0.0-1ubuntu7.19 | UBUNTU-CVE-2026-63623 |
| Ubuntu:22.04:LTS | libvirt | 8.0.0-1ubuntu7.19 | USN-8652-1 |
| Ubuntu:24.04:LTS | libvirt | 10.0.0-2ubuntu8.16 | USN-8652-1 |
| Ubuntu:24.04:LTS | libvirt | 10.0.0-2ubuntu8.16 | UBUNTU-CVE-2026-63623 |
| Ubuntu:26.04:LTS | libvirt | 12.0.0-1ubuntu5.3 | USN-8652-1 |
| Ubuntu:26.04:LTS | libvirt | 12.0.0-1ubuntu5.3 | UBUNTU-CVE-2026-63623 |
| Ubuntu:26.04:LTS | libvirt-hwe | 12.0.0-1ubuntu5.5 | USN-8833-1 |
| Ubuntu:26.04:LTS | libvirt-hwe | 12.0.0-1ubuntu5.5 | UBUNTU-CVE-2026-63623 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux for NVIDIA 26 | see references |
Weakness: CWE-732 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- https://access.redhat.com/security/cve/CVE-2026-63623 vdb-entry, x_refsource_REDHAT
- RHBZ#2513066 issue-tracking, x_refsource_REDHAT