OpenStack Nova calls qemu-img without format restrictions for resize
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-24708US | — | — | ||
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… | ||||
references
External citations — patches, advisories, analysis.
- https://bugs.launchpad.net/nova/+bug/2137507WEB
- https://github.com/advisories/GHSA-m4f3-qp2w-gwh6ADVISORY
- https://github.com/openstack/novaPACKAGE
- https://github.com/openstack/nova/commit/3eba22ff09c81a61750fbb4882e5f1f01a20fdf5WEB
- https://lists.debian.org/debian-lts-announce/2026/02/msg00025.htmlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-24708ADVISORY
- https://pypi.org/project/novaPACKAGE
- https://www.openwall.com/lists/oss-security/2026/02/17/7WEB
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