Bug 2423549 (CVE-2025-14876)

Summary:	CVE-2025-14876 qemu-kvm: Unbounded allocation in virtio-crypto
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in the virtio-crypto device of QEMU. A malicious guest operating system can exploit a missing length limit in the AKCIPHER path, leading to uncontrolled memory allocation. This can result in a denial of service (DoS) on the host system by causing the QEMU process to terminate unexpectedly.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2423564, 2423565
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Description OSIDB Bzimport 2025-12-18 12:34:27 UTC

A flaw was found in the virtio-crypto device of QEMU. The symmetric path enforces a length limit using conf.max_size, but the AKCIPHER path does not impose any bound. This could allow a malicious guest to trigger a memory exhaustion condition, potentially resulting in a denial of service (DoS) by aborting the QEMU process on the host.

Upstream patch:
https://lore.kernel.org/qemu-devel/20251221024321.143196-1-zhenwei.pi@linux.dev/

Comment 4 Mauro Matteo Cascella 2026-02-06 11:09:05 UTC

Upstream patch & fix commit:
- https://lore.kernel.org/qemu-devel/20251221024321.143196-3-zhenwei.pi@linux.dev/T/
- https://gitlab.com/qemu-project/qemu/-/commit/91c6438caffc880e999a7312825479685d659b44