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Fencer Vulns
medium 6.7

CVE-2026-48914 json

Qemu-kvm: heap buffer overflow in virtio-blk scsi request handling

published 2026-06-12 4 mo ago modified 2026-11-05 3 d ago also EUVD-2026-36408

cvss
6.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

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 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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 18:10.1.0-16.el10_2.5
  • Red Hat Red Hat Enterprise Linux 9 17:10.1.0-17.el9_8.4
  • qemu Debian 13 1:10.0.11+ds-0+deb13u1
  • qemu Debian 14 1:11.0.2+ds-1

debian advisories DEBIAN-CVE-2026-48914

  • qemu-kvm RHEL 10.2 18:10.1.0-16.el10_2.5
  • qemu-img RHEL 10.2 18:10.1.0-16.el10_2.5
  • qemu-kvm-core RHEL 10.2 18:10.1.0-16.el10_2.5
  • qemu-kvm-tools RHEL 10.2 18:10.1.0-16.el10_2.5
  • qemu-pr-helper RHEL 10.2 18:10.1.0-16.el10_2.5
  • qemu-kvm-common RHEL 10.2 18:10.1.0-16.el10_2.5
  • qemu-guest-agent RHEL 10.2 18:10.1.0-16.el10_2.5
  • qemu-kvm-audio-pa RHEL 10.2 18:10.1.0-16.el10_2.5

red hat advisories RHSA-2026:58571RHSA-2026:39311

  • qemu SLE Module for Server Applications 15 SP7, SLE Module for Package Hub 15 SP7, SLE Module for Basesystem 15 SP7 9.2.4-150700.3.23.1
  • qemu-linux-user SLE Module for Package Hub 15 SP7 9.2.4-150700.3.23.1
  • qemu SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 10.0.11-160000.1.1
  • qemu-linux-user SLES for SAP applications 16.0, SLES 16.0 10.0.11-160000.1.1

suse advisories SUSE-SU-2026:3038-1SUSE-SU-2026:22550-1SUSE-SU-2026:22576-1

  • qemu openSUSE Tumbleweed 11.0.2-1.1
  • qemu openSUSE Leap 16.0 10.0.11-160000.1.1
  • qemu-linux-user openSUSE Leap 16.0 10.0.11-160000.1.1

opensuse advisories openSUSE-SU-2026:11250-1openSUSE-SU-2026:21253-1

  • qemu-kvm AlmaLinux 10 18:10.1.0-16.el10_2.5.alma.1
  • qemu-img AlmaLinux 10 18:10.1.0-16.el10_2.5.alma.1
  • qemu-kvm-core AlmaLinux 10 18:10.1.0-16.el10_2.5.alma.1
  • qemu-kvm-tools AlmaLinux 10 18:10.1.0-16.el10_2.5.alma.1
  • qemu-pr-helper AlmaLinux 10 18:10.1.0-16.el10_2.5.alma.1
  • qemu-kvm-common AlmaLinux 10 18:10.1.0-16.el10_2.5.alma.1
  • qemu-guest-agent AlmaLinux 10 18:10.1.0-16.el10_2.5.alma.1
  • qemu-kvm-audio-pa AlmaLinux 10 18:10.1.0-16.el10_2.5.alma.1

almalinux advisories ALSA-2026:58571ALSA-2026:39311

  • qemu-kvm Rocky Linux 10 8:10.1.0-16.el10_2.5
  • qemu-kvm Rocky Linux 9 7:10.1.0-17.el9_8.4

rocky linux advisories RLSA-2026:58571RLSA-2026:39311

  • qemu Azure Linux 3.0 9.1.0-8

azure linux advisories AZL-90138

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-48914 updated cvss 6.7

qemu-kvm: Heap buffer overflow in virtio-blk SCSI request handling

  • Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32 Red Hat Enterprise Linux 7 qemu-img, qemu-kvm, libcacard, qemu-img-ma, qemu-kvm-ma, qemu-kvm-tools, +5 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 qemu-img, qemu-kvm, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, qemu-guest-agent, +8 more Red Hat Enterprise Linux for NVIDIA 26 qemu-kvm Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 9) qemu-img 10.1.0-17.el9_8.4, qemu-kvm 10.1.0-17.el9_8.4, qemu-kvm-core 10.1.0-17.el9_8.4, qemu-kvm-tools 10.1.0-17.el9_8.4, qemu-pr-helper 10.1.0-17.el9_8.4, qemu-kvm-common 10.1.0-17.el9_8.4, +13 more
    fixed: vendor fix RHSA-2026:39311
  • Red Hat Enterprise Linux AppStream (v. 10) qemu-img 10.1.0-16.el10_2.5, qemu-kvm 10.1.0-16.el10_2.5, qemu-kvm-core 10.1.0-16.el10_2.5, qemu-kvm-tools 10.1.0-16.el10_2.5, qemu-pr-helper 10.1.0-16.el10_2.5, qemu-kvm-common 10.1.0-16.el10_2.5, +13 more
    fixed: vendor fix RHSA-2026:58571

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux for NVIDIA 26
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.