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QEMU CVE-2026-48914

| EUVDEUVD-2026-36408 MEDIUM
Heap-based Buffer Overflow (CWE-122)
2026-06-12 redhat GHSA-4hmh-vx7h-h98p
6.7
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
6.7 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H
vuln.today AI
6.7 MEDIUM

Attack originates inside the guest VM (AV:L), requires guest root access (PR:H), crosses guest-to-host boundary (S:C), with primary impact being QEMU process crash (A:H) and minor heap corruption (I:L).

3.1 AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H
4.0 AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
6.7 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jun 12, 2026 - 10:03 vuln.today
CVE Published
Jun 12, 2026 - 09:42 cve.org
MEDIUM 6.7

DescriptionCVE.org

A flaw was found in QEMU's virtio-blk device. The issue arises because the device does not properly validate the size of input descriptors before writing data. A malicious guest with high privileges could exploit this vulnerability by submitting a malformed virtio-blk SCSI request, leading to an out-of-bounds write in the host heap memory and a potential denial of service (DoS) for the QEMU process.

AnalysisAI

Out-of-bounds heap write in QEMU's virtio-blk device allows a high-privileged guest to crash the host QEMU process. The flaw exists because the virtio-blk device omits validation of input descriptor sizes prior to writing data, enabling a malicious guest operator to submit a crafted virtio-blk SCSI request that writes beyond the allocated host heap buffer. The primary confirmed impact is a denial of service (DoS) of the QEMU process on the host; no public exploit code has been identified at time of analysis and it is not listed in the CISA KEV catalog.

Technical ContextAI

QEMU's virtio-blk device implements a paravirtualized block storage interface using the virtio transport protocol. Guest operating systems submit I/O requests via virtqueue descriptors; the host-side QEMU process processes these descriptors and performs the corresponding operations. CWE-122 (Heap-based Buffer Overflow) identifies the root cause: when handling SCSI pass-through requests over virtio-blk, the device handler does not enforce an upper bound on incoming descriptor sizes before writing data into host heap-allocated buffers. Affected products per CPE data span the QEMU packages as shipped in Red Hat Enterprise Linux 6 through 10, RHEL for NVIDIA 26, and Red Hat OpenShift Container Platform 4. The upstream patch submission is traceable to the QEMU developer mailing list (lore.kernel.org, 2026-05-26, author stefanha@redhat.com), indicating the fix originates in the upstream QEMU project before Red Hat downstream integration.

RemediationAI

Apply the Red Hat-released errata packages for the affected RHEL and OpenShift versions once published; monitor the advisory at https://access.redhat.com/security/cve/CVE-2026-48914 and the Bugzilla ticket at https://bugzilla.redhat.com/show_bug.cgi?id=2488283 for errata availability. An upstream patch was submitted to the QEMU mailing list on 2026-05-26 (https://lore.kernel.org/qemu-devel/20260526154957.1741622-1-stefanha@redhat.com/) but a confirmed released patched QEMU version has not been independently verified from the available data. As a compensating control, restrict the use of SCSI pass-through (virtio-blk SCSI) within guest VMs by setting the virtio-blk device without SCSI support enabled in the QEMU command line (omit or set scsi=off in the -device virtio-blk-pci arguments); note this disables guest-initiated SCSI commands but does not affect standard block I/O. In multi-tenant environments, enforcing guest isolation policies and limiting guest root access reduces the exploitable surface. No exact patched version number is available to cite from the provided data.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.4 Affected
SUSE Linux Enterprise Micro 5.5 Affected

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CVE-2026-48914 vulnerability details – vuln.today

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