Description (CNA)
An issue was discovered in OpenStack Nova before 30.2.2, 31 before 31.2.1, and 32 before 32.1.1. By writing a malicious QCOW header to a root or ephemeral disk and then triggering a resize, a user may convince Nova's Flat image backend to call qemu-img without a format restriction, resulting in an unsafe image resize operation that could destroy data on the host system. Only compute nodes using the Flat image backend (usually configured with use_cow_images=False) are affected.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| OpenStack / Nova | affected 0 before 30.2.2; affected 31.0.0 before 31.2.1; affected 32.0.0 before 32.1.1 |
CWE
CWE-669
References
- https://bugs.launchpad.net/nova/+bug/2137507
- https://www.openwall.com/lists/oss-security/2026/02/17/7
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.
A flaw in OpenStack Nova’s interaction with the qemu-img utility allows an authenticated user to overwrite arbitrary files on the compute host. This occurs because Nova invokes qemu-img without strictly constraining the disk image format, enabling a malicious user to craft a QCOW2 header on a raw disk and trigger destructive behavior during instance operations such as resize.
- https://access.redhat.com/security/cve/CVE-2026-24708
- https://bugzilla.redhat.com/show_bug.cgi?id=2430312
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24708.json
- https://access.redhat.com/errata/RHSA-2026:54757
- https://access.redhat.com/errata/RHSA-2026:66401
- https://access.redhat.com/errata/RHSA-2026:7884