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CVE-2018-7858· NVD / CVE Program· CNA mitre

Quick Emulator (aka QEMU), when built with the Cirrus CLGD 54xx VGA Emulator support, allows local guest OS privileged users to cause a deni

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.61% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: qemu (Debian:12) 1:2.12~rc3+dfsg-1; qemu-guest-agent (Red Hat:enterprise_linux:6::client) 2:0.12.1.2-2.506.el6_10.1; qemu-img (Red Hat:enterprise_linux:6::client) 2:0.12.1.2-2.506.el6_10.1.

Low priority for now. Upgrade to qemu (Debian:12) 1:2.12~rc3+dfsg-1; qemu-guest-agent (Red Hat:enterprise_linux:6::client) 2:0.12.1.2-2.506.el6_10.1; qemu-img (Red Hat:enterprise_linux:6::client) 2:0.12.1.2-2.506.el6_10.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Quick Emulator (aka QEMU), when built with the Cirrus CLGD 54xx VGA Emulator support, allows local guest OS privileged users to cause a denial of service (out-of-bounds access and QEMU process crash) by leveraging incorrect region calculation when updating VGA display.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Mar 12, 2018
Updated
Jun 16, 2026
EPSS
0.6% · 48th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
qemuqemu
opensuseleap
redhatenterprise linux desktop
redhatenterprise linux server
redhatenterprise linux server aus
redhatenterprise linux server eus
redhatenterprise linux server tus
redhatenterprise linux workstation
canonicalubuntu linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux18.10
  • opensuse leap42.3
  • qemu qemuup to 2.11.2 inclusive
  • redhat enterprise linux desktop6.0
  • redhat enterprise linux desktop7.0
  • redhat enterprise linux server6.0
  • redhat enterprise linux server7.0
  • redhat enterprise linux server aus7.6
  • redhat enterprise linux server eus7.5
  • redhat enterprise linux server eus7.6
  • redhat enterprise linux server tus7.6
  • redhat enterprise linux workstation6.0
  • redhat enterprise linux workstation7.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12qemubefore 1:2.12~rc3+dfsg-11:2.12~rc3+dfsg-1
Red Hat:enterprise_linux:6::clientqemu-guest-agentbefore 2:0.12.1.2-2.506.el6_10.12:0.12.1.2-2.506.el6_10.1
Red Hat:enterprise_linux:6::clientqemu-imgbefore 2:0.12.1.2-2.506.el6_10.12:0.12.1.2-2.506.el6_10.1
Red Hat:enterprise_linux:6::clientqemu-kvmbefore 2:0.12.1.2-2.506.el6_10.12:0.12.1.2-2.506.el6_10.1
Red Hat:enterprise_linux:6::clientqemu-kvm-debuginfobefore 2:0.12.1.2-2.506.el6_10.12:0.12.1.2-2.506.el6_10.1
Red Hat:enterprise_linux:6::clientqemu-kvm-toolsbefore 2:0.12.1.2-2.506.el6_10.12:0.12.1.2-2.506.el6_10.1
Red Hat:enterprise_linux:7::clientqemu-imgbefore 10:1.5.3-156.el7_5.110:1.5.3-156.el7_5.1
Red Hat:enterprise_linux:7::clientqemu-kvmbefore 10:1.5.3-156.el7_5.110:1.5.3-156.el7_5.1
Red Hat:enterprise_linux:7::clientqemu-kvm-commonbefore 10:1.5.3-156.el7_5.110:1.5.3-156.el7_5.1
Red Hat:enterprise_linux:7::clientqemu-kvm-debuginfobefore 10:1.5.3-156.el7_5.110:1.5.3-156.el7_5.1
Red Hat:enterprise_linux:7::clientqemu-kvm-toolsbefore 10:1.5.3-156.el7_5.110:1.5.3-156.el7_5.1
Red Hat:enterprise_linux:7::hypervisorqemu-img-rhevbefore 10:2.10.0-21.el7_5.210:2.10.0-21.el7_5.2
Red Hat:enterprise_linux:7::hypervisorqemu-kvm-common-rhevbefore 10:2.10.0-21.el7_5.210:2.10.0-21.el7_5.2
Red Hat:enterprise_linux:7::hypervisorqemu-kvm-rhevbefore 10:2.10.0-21.el7_5.210:2.10.0-21.el7_5.2
Red Hat:enterprise_linux:7::hypervisorqemu-kvm-rhev-debuginfobefore 10:2.10.0-21.el7_5.210:2.10.0-21.el7_5.2
Red Hat:enterprise_linux:7::hypervisorqemu-kvm-tools-rhevbefore 10:2.10.0-21.el7_5.210:2.10.0-21.el7_5.2
Red Hat:openstack:12::el7qemu-img-rhevbefore 10:2.10.0-21.el7_5.310:2.10.0-21.el7_5.3
Red Hat:openstack:12::el7qemu-kvm-common-rhevbefore 10:2.10.0-21.el7_5.310:2.10.0-21.el7_5.3
Red Hat:openstack:12::el7qemu-kvm-rhevbefore 10:2.10.0-21.el7_5.310:2.10.0-21.el7_5.3
Red Hat:openstack:12::el7qemu-kvm-rhev-debuginfobefore 10:2.10.0-21.el7_5.310:2.10.0-21.el7_5.3
Red Hat:openstack:12::el7qemu-kvm-tools-rhevbefore 10:2.10.0-21.el7_5.310:2.10.0-21.el7_5.3
SUSE:Linux Enterprise Desktop 12 SP3qemubefore 2.9.1-6.28.12.9.1-6.28.1
SUSE:OpenStack Cloud 7qemubefore 2.6.2-41.49.12.6.2-41.49.1

Same product

qemu: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-12928The QMP migrate command in QEMU version 4.0.0 and earlier is vulnerable to OS command injection, which allows the remote attacker to achieve
    46Plan
  • CVE-2015-8556Local privilege escalation vulnerability in the Gentoo QEMU package before 2.5.0-r1.
    44Plan
  • CVE-2017-15118A stack-based buffer overflow vulnerability was found in NBD server implementation in qemu before 2.11 allowing a client to request an expor
    43Plan
  • CVE-2022-36648The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier, allows remote attackers
    41Plan
  • CVE-2017-16845hw/input/ps2.c in Qemu does not validate 'rptr' and 'count' values during guest migration, leading to out-of-bounds access.
    41Plan
  • CVE-2016-7161Heap-based buffer overflow in the .receive callback of xlnx.xps-ethernetlite in QEMU (aka Quick Emulator) allows attackers to execute arbitr
    41Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:qemu1:2.12~rc3+dfsg-1 · Debian:12Package registry (OSV)
red hat:qemu-guest-agent2:0.12.1.2-2.506.el6_10.1 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:qemu-img10:1.5.3-156.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:qemu-img-rhev10:2.10.0-21.el7_5.2 · Red Hat:enterprise_linux:7::hypervisorPackage registry (OSV)
red hat:qemu-kvm10:1.5.3-156.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:qemu-kvm-common10:1.5.3-156.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:qemu-kvm-common-rhev10:2.10.0-21.el7_5.2 · Red Hat:enterprise_linux:7::hypervisorPackage registry (OSV)
red hat:qemu-kvm-debuginfo10:1.5.3-156.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:qemu-kvm-rhev10:2.10.0-21.el7_5.2 · Red Hat:enterprise_linux:7::hypervisorPackage registry (OSV)
red hat:qemu-kvm-rhev-debuginfo10:2.10.0-21.el7_5.2 · Red Hat:enterprise_linux:7::hypervisorPackage registry (OSV)
red hat:qemu-kvm-tools10:1.5.3-156.el7_5.1 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:qemu-kvm-tools-rhev10:2.10.0-21.el7_5.2 · Red Hat:enterprise_linux:7::hypervisorPackage registry (OSV)
suse:qemu2.6.2-41.49.1 · SUSE:OpenStack Cloud 7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records