A QEMU security update has been released for Ubuntu Linux 20.04 LTS, 18.04 LTS, and 16.04 LTS.

USN-4511-1: QEMU vulnerability

==========================================================================
Ubuntu Security Notice USN-4511-1
September 17, 2020

qemu vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

QEMU could be made to crash or run programs.

Software Description:
- qemu: Machine emulator and virtualizer

Details:

Ziming Zhang, Xiao Wei, Gonglei Arei, and Yanyu Zhang discovered that QEMU
incorrectly handled certain USB packets. An attacker inside the guest could
use this issue to cause QEMU to crash, resulting in a denial of service, or
possibly execute arbitrary code on the host. In the default installation,
when QEMU is used with libvirt, attackers would be isolated by the libvirt
AppArmor profile.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
qemu 1:4.2-3ubuntu6.6
qemu-system 1:4.2-3ubuntu6.6
qemu-system-arm 1:4.2-3ubuntu6.6
qemu-system-mips 1:4.2-3ubuntu6.6
qemu-system-ppc 1:4.2-3ubuntu6.6
qemu-system-s390x 1:4.2-3ubuntu6.6
qemu-system-sparc 1:4.2-3ubuntu6.6
qemu-system-x86 1:4.2-3ubuntu6.6
qemu-system-x86-microvm 1:4.2-3ubuntu6.6
qemu-system-x86-xen 1:4.2-3ubuntu6.6

Ubuntu 18.04 LTS:
qemu 1:2.11+dfsg-1ubuntu7.32
qemu-system 1:2.11+dfsg-1ubuntu7.32
qemu-system-arm 1:2.11+dfsg-1ubuntu7.32
qemu-system-mips 1:2.11+dfsg-1ubuntu7.32
qemu-system-ppc 1:2.11+dfsg-1ubuntu7.32
qemu-system-s390x 1:2.11+dfsg-1ubuntu7.32
qemu-system-sparc 1:2.11+dfsg-1ubuntu7.32
qemu-system-x86 1:2.11+dfsg-1ubuntu7.32

Ubuntu 16.04 LTS:
qemu 1:2.5+dfsg-5ubuntu10.46
qemu-block-extra 1:2.5+dfsg-5ubuntu10.46
qemu-guest-agent 1:2.5+dfsg-5ubuntu10.46
qemu-kvm 1:2.5+dfsg-5ubuntu10.46
qemu-system 1:2.5+dfsg-5ubuntu10.46
qemu-system-aarch64 1:2.5+dfsg-5ubuntu10.46
qemu-system-arm 1:2.5+dfsg-5ubuntu10.46
qemu-system-common 1:2.5+dfsg-5ubuntu10.46
qemu-system-mips 1:2.5+dfsg-5ubuntu10.46
qemu-system-misc 1:2.5+dfsg-5ubuntu10.46
qemu-system-ppc 1:2.5+dfsg-5ubuntu10.46
qemu-system-s390x 1:2.5+dfsg-5ubuntu10.46
qemu-system-sparc 1:2.5+dfsg-5ubuntu10.46
qemu-system-x86 1:2.5+dfsg-5ubuntu10.46
qemu-user 1:2.5+dfsg-5ubuntu10.46
qemu-user-binfmt 1:2.5+dfsg-5ubuntu10.46
qemu-user-static 1:2.5+dfsg-5ubuntu10.46
qemu-utils 1:2.5+dfsg-5ubuntu10.46

After a standard system update you need to restart all QEMU virtual
machines to make all the necessary changes.

References:
  https://usn.ubuntu.com/4511-1
CVE-2020-14364

Package Information:
  https://launchpad.net/ubuntu/+source/qemu/1:4.2-3ubuntu6.6
  https://launchpad.net/ubuntu/+source/qemu/1:2.11+dfsg-1ubuntu7.32
  https://launchpad.net/ubuntu/+source/qemu/1:2.5+dfsg-5ubuntu10.46