2.1 - RHSA-2016:2585

Problem Description:

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 Moderate. 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 AMD64 and Intel 64 systems. The qemu-kvm packages provide the user-space component for running virtual machines using KVM.

Security Fix(es):

* An integer overflow flaw and an out-of-bounds read flaw were found in the way QEMU's VGA emulator set certain VGA registers while in VBE mode. A privileged guest user could use this flaw to crash the QEMU process instance. (CVE-2016-3712)

* An infinite loop flaw was found in the way QEMU's e1000 NIC emulation implementation processed data using transmit or receive descriptors under certain conditions. A privileged user inside a guest could use this flaw to crash the QEMU instance. (CVE-2016-1981)

Red Hat would like to thank Zuozhi Fzz (Alibaba Inc.) for reporting CVE-2016-3712.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

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/):

1156635 - Libvirt is confused that qemu-kvm exposes 'block-job-cancel' but not 'block-stream' 1177318 - Guest using rbd based image as disk failed to start when sandbox was enabled 1252757 - [RHEL-7.2-qmu-kvm] Package is 100% lost when ping from host to Win2012r2 guest with 64000 size 1256741 - "CapsLock" will work as "\" when boot a guest with usb-kbd 1265427 - contents of MSR_TSC_AUX are not migrated 1268345 - posix_fallocate emulation on NFS fails with Bad file descriptor if fd is opened O_WRONLY 1268879 - Camera stops work after remote-viewer re-connection [qemu-kvm] 1269738 - Vlan table display repeat four times in qmp when queues=4 1272523 - qemu-kvm build failure race condition in tests/ide-test 1276036 - Crash on QMP input exceeding limits 1277248 - ceph.conf properties override qemu's command-line properties 1283116 - [abrt] qemu-img: get_block_status(): qemu-img killed by SIGABRT 1298570 - CVE-2016-1981 Qemu: net: e1000 infinite loop in start_xmit and e1000_receive_iov routines 1299116 - qemu-img created VMDK images lead to "Not a supported disk format (sparse VMDK version too old)" 1299250 - qemu-img created VMDK images are unbootable 1312289 - "qemu-kvm: /builddir/build/BUILD/qemu-1.5.3/hw/scsi/virtio-scsi.c:533: virtio_scsi_push_event: Assertion `event == 0' failed" after hotplug 20 virtio-scsi disks then hotunplug them 1318712 - CVE-2016-3712 qemu-kvm: Out-of-bounds read when creating weird vga screen surface 1330969 - match the OEM ID and OEM Table ID fields of the FADT and the RSDT to those of the SLIC 1333159 - qemu-kvm doesn't reload udev rules before triggering for kvm device 1336491 - Ship FD connection patches qemu-kvm part 1340971 - qemu: accel=tcg does not implement SSE 4 properly 1346982 - Regression from CVE-2016-3712: windows installer fails to start [rhel-7.3] 1351106 - symbol lookup error: /usr/libexec/qemu-kvm: undefined symbol: libusb_get_port_numbers 1355730 - spice-gtk shows outdated screen state after migration [qemu-kvm] 1360137 - GLib-WARNING **: gmem.c:482: custom memory allocation vtable not supported 1367040 - QEMU crash when guest notifies non-existent virtqueue 1371619 - Flags xsaveopt xsavec xgetbv1 are missing on qemu-kvm 1376542 - RHSA-2016-1756 breaks migration of instances