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Fencer Vulns
high 8.8

CVE-2018-7550 json

The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on th…

published 2018-03-01 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-19277

cvss
8.8
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

The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than mh_bss_end_addr, which triggers an out-of-bounds read or write memory access.

Patch / fix

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

debian advisories DEBIAN-CVE-2018-7550

  • qemu Ubuntu 14.04 LTS 2.0.0+dfsg-2ubuntu1.41
  • qemu Ubuntu 16.04 LTS 1:2.5+dfsg-5ubuntu10.28
  • qemu Ubuntu 18.04 LTS 1:2.11+dfsg-1ubuntu7.1

ubuntu advisories UBUNTU-CVE-2018-7550

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-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
  • qemu-kvm RHEL 7 10:1.5.3-156.el7_5.5
  • qemu-img RHEL 7 10:1.5.3-156.el7_5.5
  • qemu-kvm-tools RHEL 7 10:1.5.3-156.el7_5.5
  • qemu-kvm-common RHEL 7 10:1.5.3-156.el7_5.5

red hat advisories RHSA-2018:1646RHSA-2018:1645RHSA-2018:1644RHSA-2018:1643RHSA-2018:2462RHSA-2018:1369

  • qemu SLE Module for Server Applications 15, SLE Module for Basesystem 15 2.11.2-9.4.1
  • kvm SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 1.4.2-53.17.1
  • xen SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3 4.2.5_21-45.22.1
  • xen SLES for SAP 12 SP1, SLES 12 SP1-LTSS, OpenStack Cloud 6 4.5.5_24-22.46.1
  • xen SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 4.4.4_30-61.26.1
  • kvm SLES for SAP 11 SP4, SLES 11 SP4 1.4.2-60.9.1
  • qemu SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +1 more 2.6.2-41.37.1
  • qemu SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 2.9.1-6.12.1

suse advisories SUSE-SU-2018:2340-1SUSE-SU-2018:1308-1SUSE-SU-2018:1203-1SUSE-SU-2018:1202-1SUSE-SU-2018:1181-1SUSE-SU-2018:1177-1

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-2018-7550 updated cvss 7.8

QEMU: i386: multiboot OOB access while loading kernel image

  • 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_5.5, qemu-kvm 1.5.3-156.el7_5.5, qemu-kvm-tools 1.5.3-156.el7_5.5, qemu-kvm-common 1.5.3-156.el7_5.5 Red Hat Enterprise Linux ComputeNode Optional (v. 7) qemu-img 1.5.3-156.el7_5.5, qemu-kvm 1.5.3-156.el7_5.5, qemu-kvm-tools 1.5.3-156.el7_5.5, qemu-kvm-common 1.5.3-156.el7_5.5 Red Hat Enterprise Linux Server (v. 7) qemu-img 1.5.3-156.el7_5.5, qemu-kvm 1.5.3-156.el7_5.5, qemu-kvm-tools 1.5.3-156.el7_5.5, qemu-kvm-common 1.5.3-156.el7_5.5 Red Hat Enterprise Linux Workstation (v. 7) qemu-img 1.5.3-156.el7_5.5, qemu-kvm 1.5.3-156.el7_5.5, qemu-kvm-tools 1.5.3-156.el7_5.5, qemu-kvm-common 1.5.3-156.el7_5.5
    fixed: vendor fix RHSA-2018:2462
  • 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
  • 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 5 kvm, xen 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-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 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/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.