---
id: CVE-2026-48914
title: A flaw was found in QEMU's virtio-blk device
summary: >-
  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 su…
severity: medium
cvss: 6.7
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H'
cwe:
  - CWE-122
published: '2026-06-12'
updated: '2026-07-13'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48914'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-48914'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2488283'
    label: secalert@redhat.com
  - url: >-
      https://lore.kernel.org/qemu-devel/20260526154957.1741622-1-stefanha@redhat.com/
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00173
epssPercentile: 0.0599
ingestedAt: '2026-07-13T10:25:38.737Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.