CVE-2026-63623
Libvirt: information disclosure via world-readable storage volume images during clone/convert
What happened?
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 software and versions
| Software | Version information | Fixed version |
|---|---|---|
| libvirtRed Hat | Default status: affected | See vendor advisory |
| libvirtRed Hat | Default status: affected | See vendor advisory |
| libvirtRed Hat | Default status: affected | See vendor advisory |
| virt:rhel/libvirtRed Hat | Default status: affected | See vendor advisory |
| libvirtRed Hat | Default status: affected | See vendor advisory |
| libvirtRed Hat | Default status: unknown | See vendor advisory |
Version information comes from the source record and can include unaffected products and exceptions. Distribution packages may contain backported fixes: an older upstream version alone does not prove a server is affected.
Is it being exploited?
This CVE was not listed in the CISA catalogue at our last retrieval. This does not establish that exploitation is absent.
How to respond
- Confirm the product, installed package version, and any configuration requirements in the vendor advisory.
- Follow the vendor’s remediation or workaround guidance in the references below. Structured fixed-version data is unavailable here; the publisher’s description may include a fix or workaround.
- Restart affected services if required, then verify the running version. Known exploitation may warrant investigation as well as patching.