Synopsis

Important: qemu-kvm security update

Type/Severity

Security Advisory: Important

Topic

An update for qemu-kvm is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Important. 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

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

Security Fix(es):

• QEMU: slirp: heap buffer overflow while reassembling fragmented datagrams (CVE-2018-11806)
• QEMU: slirp: heap buffer overflow in tcp_emu() (CVE-2019-6778)
• QEMU: ne2000: integer overflow leads to buffer overflow issue (CVE-2018-10839)
• QEMU: pcnet: integer overflow leads to buffer overflow (CVE-2018-17962)
• QEMU: qxl: null pointer dereference while releasing spice resources (CVE-2019-12155)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

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.

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64

Fixes

• BZ - 1581013 - CVE-2018-10839 QEMU: ne2000: integer overflow leads to buffer overflow issue
• BZ - 1586245 - CVE-2018-11806 QEMU: slirp: heap buffer overflow while reassembling fragmented datagrams
• BZ - 1636773 - CVE-2018-17962 QEMU: pcnet: integer overflow leads to buffer overflow
• BZ - 1664205 - CVE-2019-6778 QEMU: slirp: heap buffer overflow in tcp_emu()
• BZ - 1712670 - CVE-2019-12155 QEMU: qxl: null pointer dereference while releasing spice resources

CVEs

• CVE-2018-10839
• CVE-2018-11806
• CVE-2018-17962
• CVE-2019-6778
• CVE-2019-12155

References