CVE-2018-7858 Denial of service in n/a
Local privileged users can crash the QEMU process via out-of-bounds access in the Cirrus VGA emulator, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-7858?
CVE-2018-7858 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 12 Mar 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-125
Which versions are affected by CVE-2018-7858?
It affects 9 products.
Linux distribution packages (20)
qemu-img Red Hat:enterprise_linux:7::client | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm Red Hat:enterprise_linux:7::client | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-common Red Hat:enterprise_linux:7::client | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-debuginfo Red Hat:enterprise_linux:7::client | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-tools Red Hat:enterprise_linux:7::client | All versions | 10:1.5.3-156.el7_5.1 |
qemu-img Red Hat:enterprise_linux:7::computenode | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm Red Hat:enterprise_linux:7::computenode | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-common Red Hat:enterprise_linux:7::computenode | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-debuginfo Red Hat:enterprise_linux:7::computenode | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-tools Red Hat:enterprise_linux:7::computenode | All versions | 10:1.5.3-156.el7_5.1 |
qemu-img Red Hat:enterprise_linux:7::server | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm Red Hat:enterprise_linux:7::server | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-common Red Hat:enterprise_linux:7::server | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-debuginfo Red Hat:enterprise_linux:7::server | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-tools Red Hat:enterprise_linux:7::server | All versions | 10:1.5.3-156.el7_5.1 |
qemu-img Red Hat:enterprise_linux:7::workstation | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm Red Hat:enterprise_linux:7::workstation | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-common Red Hat:enterprise_linux:7::workstation | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-debuginfo Red Hat:enterprise_linux:7::workstation | All versions | 10:1.5.3-156.el7_5.1 |
qemu-kvm-tools Red Hat:enterprise_linux:7::workstation | All versions | 10:1.5.3-156.el7_5.1 |
Products include Canonical Ubuntu Linux, Opensuse Leap, Qemu Qemu, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus and 3 more.
How do I fix CVE-2018-7858?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2018-7858 being exploited?
There is no known exploitation of CVE-2018-7858 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2018-7858, GHSA-f62g-jrwm-hq59, RHSA-2018:1416, UBUNTU-CVE-2018-7858.