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Fencer Vulns
medium 5.1

CVE-2026-2243 json

Qemu-kvm: heap buffer out-of-bounds read in vmdk compressed grain parsing

published 2026-02-19 8 mo ago modified 2026-11-06 2 d ago also EUVD-2026-7806

cvss
5.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

A flaw was found in QEMU. A specially crafted VMDK image could trigger an out-of-bounds read vulnerability, potentially leading to a 12-byte leak of sensitive information or a denial of service condition (DoS).

Patch / fix

  • qemu Debian 13 1:10.0.10+ds-0+deb13u1
  • qemu Debian 14 1:10.2.2+ds-1

debian advisories DEBIAN-CVE-2026-2243

  • qemu Ubuntu 22.04 LTS 1:6.2+dfsg-2ubuntu6.30
  • qemu Ubuntu 24.04 LTS 1:8.2.2+ds-0ubuntu1.16
  • qemu Ubuntu 25.10 1:10.1.0+ds-5ubuntu2.6
  • qemu Ubuntu Pro 14.04 LTS 2.0.0+dfsg-2ubuntu1.47+esm6
  • qemu Ubuntu Pro 16.04 LTS 1:2.5+dfsg-5ubuntu10.51+esm4
  • qemu Ubuntu Pro 18.04 LTS 1:2.11+dfsg-1ubuntu7.42+esm5
  • qemu Ubuntu Pro 20.04 LTS 1:4.2-3ubuntu6.30+esm1

ubuntu advisories UBUNTU-CVE-2026-2243

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • qemu SLE Module for Server Applications 15 SP7, SLE Micro 5.5 7.1.0-150500.49.42.1
  • qemu SLE Module for Server Applications 15 SP7, SLE Module for Package Hub 15 SP7, SLE Module for Basesystem 15 SP7 9.2.4-150700.3.20.1
  • qemu-linux-user SLE Module for Package Hub 15 SP7 9.2.4-150700.3.20.1
  • qemu Linux Micro 6.2 10.0.9-160000.1.1
  • qemu SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 3.1.1.1-84.1
  • qemu SLES for SAP 15 SP6, SLES 15 SP6-LTSS 8.2.10-150600.3.49.1

suse advisories SUSE-SU-2026:2406-1SUSE-SU-2026:2388-1SUSE-SU-2026:2386-1SUSE-SU-2026:2385-1SUSE-SU-2026:21235-1

  • qemu openSUSE Leap 16.0 10.0.9-160000.1.1
  • qemu-linux-user openSUSE Leap 16.0 10.0.9-160000.1.1
  • qemu openSUSE Tumbleweed 10.2.2-1.1

opensuse advisories openSUSE-SU-2026:20567-1openSUSE-SU-2026:10395-1

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-2026-2243 updated cvss 5.1

qemu-kvm: Heap buffer out-of-bounds read in VMDK compressed grain parsing

  • 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 9 qemu-img, qemu-kvm, qemu-kvm-core, qemu-kvm-tools, qemu-pr-helper, qemu-kvm-common, +16 more Red Hat Enterprise Linux 10 qemu-kvm Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: no fix available “Fix deferred”

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
8 mo ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • 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 9
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness

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.