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Fencer Vulns
medium 5.5

CVE-2018-7858 json

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

published 2018-03-12 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-19570

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

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.

Patch / fix

  • qemu Debian 14, Debian 13, Debian 12 1:2.12~rc3+dfsg-1

debian advisories DEBIAN-CVE-2018-7858

  • qemu Ubuntu 18.04 LTS 1:2.11+dfsg-1ubuntu7.1

ubuntu advisories UBUNTU-CVE-2018-7858

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-kvm RHEL 6 2:0.12.1.2-2.506.el6_10.1
  • qemu-img RHEL 6 2:0.12.1.2-2.506.el6_10.1
  • qemu-kvm-tools RHEL 6 2:0.12.1.2-2.506.el6_10.1
  • qemu-guest-agent RHEL 6 2:0.12.1.2-2.506.el6_10.1
  • qemu-kvm-rhev openstack 12, openstack 10, openstack 9 +1 more 10:2.10.0-21.el7_5.3
  • qemu-img-rhev openstack 12, openstack 10, openstack 9 +1 more 10:2.10.0-21.el7_5.3
  • qemu-kvm-tools-rhev openstack 12, openstack 10, openstack 9 +1 more 10:2.10.0-21.el7_5.3
  • qemu-kvm-common-rhev openstack 12, openstack 10, openstack 9 +1 more 10:2.10.0-21.el7_5.3

red hat advisories RHSA-2018:2162RHSA-2018:1646RHSA-2018:1645RHSA-2018:1644RHSA-2018:1643RHSA-2018:1416

  • qemu SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 2.9.1-6.28.1
  • qemu SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +2 more 2.6.2-41.49.1

suse advisories SUSE-SU-2019:0582-1SUSE-SU-2019:0489-1

  • qemu openSUSE Tumbleweed 6.1.0-32.1

opensuse advisories openSUSE-SU-2024:11287-1

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-2018-7858 updated cvss 5.5

QEMU: cirrus: OOB access when updating VGA display

  • Red Hat Enterprise Linux 5 kvm, xen Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) qemu-img-rhev, qemu-kvm-rhev, libcacard-rhev, qemu-kvm-tools-rhev, libcacard-devel-rhev, libcacard-tools-rhev, +1 more Red Hat OpenStack Platform 11 (Ocata) qemu-kvm-rhev
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) qemu-img 1.5.3-156.el7_5.1, qemu-kvm 1.5.3-156.el7_5.1, qemu-kvm-tools 1.5.3-156.el7_5.1, qemu-kvm-common 1.5.3-156.el7_5.1 Red Hat Enterprise Linux ComputeNode Optional (v. 7) qemu-img 1.5.3-156.el7_5.1, qemu-kvm 1.5.3-156.el7_5.1, qemu-kvm-tools 1.5.3-156.el7_5.1, qemu-kvm-common 1.5.3-156.el7_5.1
    fixed: vendor fix RHSA-2018:1416
  • Red Hat Enterprise Linux Desktop (v. 6) qemu-img 0.12.1.2-2.506.el6_10.1, qemu-kvm 0.12.1.2-2.506.el6_10.1, qemu-kvm-tools 0.12.1.2-2.506.el6_10.1, qemu-guest-agent 0.12.1.2-2.506.el6_10.1 Red Hat Enterprise Linux HPC Node (v. 6) qemu-img 0.12.1.2-2.506.el6_10.1, qemu-kvm 0.12.1.2-2.506.el6_10.1, qemu-kvm-tools 0.12.1.2-2.506.el6_10.1, qemu-guest-agent 0.12.1.2-2.506.el6_10.1 Red Hat Enterprise Linux Server (v. 6) qemu-img 0.12.1.2-2.506.el6_10.1, qemu-kvm 0.12.1.2-2.506.el6_10.1, qemu-kvm-tools 0.12.1.2-2.506.el6_10.1, qemu-guest-agent 0.12.1.2-2.506.el6_10.1
    fixed: vendor fix RHSA-2018:2162
  • Red Hat Enterprise Linux Server (v. 7) qemu-img 1.5.3-156.el7_5.1, qemu-kvm 1.5.3-156.el7_5.1, qemu-kvm-tools 1.5.3-156.el7_5.1, qemu-kvm-common 1.5.3-156.el7_5.1
    fixed: vendor fix RHSA-2018:1416
  • Red Hat Enterprise Linux Workstation (v. 6) qemu-img 0.12.1.2-2.506.el6_10.1, qemu-kvm 0.12.1.2-2.506.el6_10.1, qemu-kvm-tools 0.12.1.2-2.506.el6_10.1, qemu-guest-agent 0.12.1.2-2.506.el6_10.1
    fixed: vendor fix RHSA-2018:2162
  • Red Hat Enterprise Linux Workstation (v. 7) qemu-img 1.5.3-156.el7_5.1, qemu-kvm 1.5.3-156.el7_5.1, qemu-kvm-tools 1.5.3-156.el7_5.1, qemu-kvm-common 1.5.3-156.el7_5.1
    fixed: vendor fix RHSA-2018:1416
  • Red Hat OpenStack Platform 8.0 (Liberty) qemu-img-rhev 2.10.0-21.el7_5.3, qemu-kvm-rhev 2.10.0-21.el7_5.3, qemu-kvm-tools-rhev 2.10.0-21.el7_5.3, qemu-kvm-common-rhev 2.10.0-21.el7_5.3
    fixed: vendor fix RHSA-2018:1646
  • Red Hat OpenStack Platform 9.0 qemu-img-rhev 2.10.0-21.el7_5.3, qemu-kvm-rhev 2.10.0-21.el7_5.3, qemu-kvm-tools-rhev 2.10.0-21.el7_5.3, qemu-kvm-common-rhev 2.10.0-21.el7_5.3
    fixed: vendor fix RHSA-2018:1645
show 4 more
  • Red Hat OpenStack Platform 10.0 qemu-img-rhev 2.10.0-21.el7_5.3, qemu-kvm-rhev 2.10.0-21.el7_5.3, qemu-kvm-tools-rhev 2.10.0-21.el7_5.3, qemu-kvm-common-rhev 2.10.0-21.el7_5.3
    fixed: vendor fix RHSA-2018:1644
  • Red Hat OpenStack Platform 12.0 qemu-img-rhev 2.10.0-21.el7_5.3, qemu-kvm-rhev 2.10.0-21.el7_5.3, qemu-kvm-tools-rhev 2.10.0-21.el7_5.3, qemu-kvm-common-rhev 2.10.0-21.el7_5.3
    fixed: vendor fix RHSA-2018:1643
  • Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts qemu-img-rhev 2.10.0-21.el7_5.2, qemu-kvm-rhev 2.10.0-21.el7_5.2, qemu-kvm-tools-rhev 2.10.0-21.el7_5.2, qemu-kvm-common-rhev 2.10.0-21.el7_5.2
    fixed: vendor fix RHSA-2018:1369
  • Red Hat Enterprise Linux 7 qemu-img-ma, qemu-kvm-ma, qemu-kvm-tools-ma, qemu-kvm-common-ma Red Hat Enterprise Linux 8 qemu-img, qemu-kvm, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, qemu-guest-agent, +8 more
    not affected: vulnerable code not present

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

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P

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.