Important: qemu-kvm-rhev security and bug fix update

Synopsis

Important: qemu-kvm-rhev security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for qemu-kvm-rhev is now available for Red Hat Virtualization for Red Hat Virtualization Host 7.

Red Hat Product Security has rated this update as having a Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm-rhev packages provide the user-space component for running virtual machines that use KVM in environments managed by Red Hat products.

Security Fix(es):

• CVE-2018-20815 QEMU: device_tree: heap buffer overflow while loading device tree blob
  
• CVE-2019-6778 QEMU: slirp: heap buffer overflow in tcp_em
  

This update fixes the following bug:

• 1705364 RHV VM pauses when 'dd' issued inside guest to a direct lun configured as virtio-scsi with scsi-passthrough
  

Users of qemu-kvm are advised to upgrade to these updated packages. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/2974891

Affected Products

• Red Hat Virtualization Manager 4.3 x86_64
• Red Hat Virtualization 4.3 x86_64
• Red Hat Virtualization Manager 4.2 x86_64
• Red Hat Virtualization for IBM Power LE 4 for RHEL 7 ppc64le

Fixes

• BZ - 1664205 - CVE-2019-6778 QEMU: slirp: heap buffer overflow in tcp_emu()
• BZ - 1693101 - CVE-2018-20815 QEMU: device_tree: heap buffer overflow while loading device tree blob

CVEs

• CVE-2018-20815
• CVE-2019-6778

References

• https://access.redhat.com/security/updates/classification/#important