EUVD-2026-55675
GHSA-m7jx-933m-5cqr
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local low-privileged access required to read transiently world-readable files; full confidentiality impact on guest disk data; no integrity or availability impact.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Sensitive guest disk contents are exposed to any local user on Red Hat Enterprise Linux KVM hosts due to qemu-img creating new volume image files with world-readable permissions during libvirt storage clone or convert operations. Affected platforms span RHEL 6 through 10 and RHEL for Nvidia 26. No public exploit code has been identified and this vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog at time of analysis, but the CVSS C:H rating reflects full guest disk exposure to a low-privileged local attacker.
Technical ContextAI
libvirt is the standard open-source virtualization management API used by KVM/QEMU hypervisors across Linux enterprise environments. The qemu-img utility, invoked by libvirt to perform storage volume clone or convert operations, creates new volume image files without applying a restrictive umask, leaving them world-readable during the interval between file creation and subsequent permission correction by libvirt. CWE-732 (Incorrect Permission Assignment for Critical Resource) describes this root cause precisely: a security-critical resource - raw guest disk images that may contain credentials, encryption keys, and sensitive application data - is created with permissions broader than necessary. CPE data confirms affected products are Red Hat Enterprise Linux versions 6, 7, 8, 9, 10, and RHEL for Nvidia 26 (cpe:2.3:a:red_hat:red_hat_enterprise_linux_*).
RemediationAI
Apply the vendor-provided libvirt package update from Red Hat for the applicable RHEL version; consult https://access.redhat.com/security/cve/CVE-2026-63623 for the exact patched package versions, as a specific fixed release was not confirmed in the available reference data at time of analysis. As a compensating control where patching is not immediately possible, restrict local login access to KVM hypervisor hosts to only trusted administrators, eliminating the local user prerequisite. Additionally, configure filesystem-level access controls (e.g., ACLs or dedicated service accounts with restricted permissions) on the libvirt image directory (typically /var/lib/libvirt/images/) to prevent non-privileged users from listing or reading files in that path - this directly interrupts the exploitation window even if qemu-img creates world-readable files. Note that these compensating controls require ongoing access management discipline and do not address the root cause permission assignment flaw.
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View allVendor StatusVendor
SUSE
| Product | Status |
|---|---|
| openSUSE Tumbleweed | Fixed |
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