Public Date:
1549798: CVE-2018-7550 QEMU: i386: multiboot OOB access while loading kernel image
Quick Emulator (QEMU), compiled with the PC System Emulator with multiboot feature support, is vulnerable to an OOB r/w memory access issue. The issue could occur while loading a kernel image during the guest boot, if mh_load_end_addr address is greater than the mh_bss_end_addr address. A user or process could use this flaw to potentially achieve arbitrary code execution on a host.

Find out more about CVE-2018-7550 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

Base Score 6.2
Base Metrics AV:L/AC:H/Au:N/C:C/I:C/A:C
Access Vector Local
Access Complexity High
Authentication None
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete

CVSS v3 metrics

CVSS3 Base Score 7.8
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity Impact High
Availability Impact High

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat OpenStack Platform 8.0 (Liberty) (qemu-kvm-rhev) RHSA-2018:1646 2018-05-22
Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts (qemu-kvm-rhev) RHSA-2018:1369 2018-05-10
Red Hat OpenStack Platform 12.0 (qemu-kvm-rhev) RHSA-2018:1643 2018-05-22
Red Hat OpenStack Platform 10 (qemu-kvm-rhev) RHSA-2018:1644 2018-05-22
Red Hat Enterprise Linux 7 (qemu-kvm) RHSA-2018:2462 2018-08-16
Red Hat OpenStack Platform 9.0 (qemu-kvm-rhev) RHSA-2018:1645 2018-05-22

Affected Packages State

Platform Package State
Red Hat OpenStack Platform 11.0 (Ocata) qemu-kvm-rhev Will not fix
Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 qemu-kvm-rhev Will not fix
Red Hat Enterprise Linux 8 qemu-kvm Not affected
Red Hat Enterprise Linux 7 qemu-kvm-ma Will not fix
Red Hat Enterprise Linux 6 qemu-kvm Not affected
Red Hat Enterprise Linux 5 kvm Not affected
Red Hat Enterprise Linux 5 xen Not affected
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.


Red Hat would like to thank Cyrille Chatras ( and CERT-CC ( for reporting this issue.
Last Modified