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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: qemu-kvm security update
Advisory ID:       RHSA-2017:1681-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1681
Issue date:        2017-07-05
CVE Names:         CVE-2017-9524 
=====================================================================

1. Summary:

An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.

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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

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

Security Fix(es):

* Quick Emulator (QEMU) built with Network Block Device (NBD) Server
support was vulnerable to a null-pointer dereference issue. The flaw could
occur when releasing a client, which was not initialized due to failed
negotiation. A remote user or process could exploit this flaw to crash the
qemu-nbd server (denial of service). (CVE-2017-9524)

4. 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.

5. Bugs fixed (https://bugzilla.redhat.com/):

1460170 - CVE-2017-9524 Qemu: nbd: segmentation fault due to client non-negotiation

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.10.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.10.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.10.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.10.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.10.src.rpm

ppc64:
qemu-img-1.5.3-126.el7_3.10.ppc64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.10.ppc64.rpm

ppc64le:
qemu-img-1.5.3-126.el7_3.10.ppc64le.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.10.ppc64le.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.10.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.10.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.10.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.10.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2017-9524
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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