RHSA-2020:1216 - Security Advisory

Topic

An update for qemu-kvm-rhev is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 and Red Hat Virtualization Engine 4.3.

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

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):

• QEMU: slirp: heap buffer overflow during packet reassembly (CVE-2019-14378)
• QEMU: block: iscsi: OOB heap access via an unexpected response of iSCSI Server (CVE-2020-1711)
• 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.

Bug Fix(es):

• After host update, older windows clients have large time drift (BZ#1639098)
• [v2v] Migration performance regression (BZ#1648622)
• Live storage migration fails with: TimeoutError: Timed out during operation: cannot acquire state change lock (held by monitor=remoteDispatchConnectGetAllDomainStats) and the VM becomes 'Not Responding' (BZ#1665256)
• QEMU gets stuck on resume/cont call from libvirt (BZ#1673546)
• [Intel 7.8 Bug] [KVM][CLX] CPUID_7_0_EDX_ARCH_CAPABILITIES is not enabled in VM qemu-kvm-rhev (BZ#1709972)
• qemu aborts in blockCommit: qemu-kvm: block.c:3486: bdrv_replace_node: Assertion `!({ _Static_assert(!(sizeof(*&from->in_flight) > 8), "not expecting: " "sizeof(*&from->in_flight) > ATOMIC_REG_SIZE"); __atomic_load_n(&from->in_flight, 0); })' failed. (BZ#1711643)
• ccid: Fix incorrect dwProtocol advertisement of T=0 (BZ#1721522)
• Fail to migrate a rhel6.10-mt7.6 guest with dimm device (BZ#1724048)
• qemu-kvm: backport cpuidle-haltpoll support (BZ#1734502)
• qemu, qemu-img fail to detect alignment with XFS and Gluster/XFS on 4k block device (BZ#1743365)
• ISST-LTE:RHV4.3 on RHEL7.6 kvm host:Power8:Tuleta-L:lotg7: call traces dumped on guest while performing guest migration (qemu-kvm-rhev) (BZ#1743508)
• qemu coredump: qemu-kvm: block/create.c:68: qmp_blockdev_create: Assertion `drv' failed (BZ#1746224)
• [Data plane]virtio_scsi_ctx_check: Assertion `blk_get_aio_context(d->conf.blk) == s->ctx' failed when unplug a device that running block stream on it (BZ#1764120)
• qemu-kvm crashes when Windows VM is migrated with multiqueue (BZ#1775251)

Enhancement(s):

• [Intel 7.8 FEAT] MDS_NO exposure to guest - qemu-kvm-rhev (BZ#1716726)

Solution

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

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

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

Fixes

• BZ - 1648622 - [v2v] Migration performance regression
• BZ - 1665256 - Live storage migration fails with: TimeoutError: Timed out during operation: cannot acquire state change lock (held by monitor=remoteDispatchConnectGetAllDomainStats) and the VM becomes 'Not Responding'
• BZ - 1711643 - qemu aborts in blockCommit: qemu-kvm: block.c:3486: bdrv_replace_node: Assertion `!({ _Static_assert(!(sizeof(*&from->in_flight) > 8), "not expecting: " "sizeof(*&from->in_flight) > ATOMIC_REG_SIZE"); __atomic_load_n(&from->in_flight, 0); })' failed.
• BZ - 1712670 - CVE-2019-12155 QEMU: qxl: null pointer dereference while releasing spice resources
• BZ - 1721522 - ccid: Fix incorrect dwProtocol advertisement of T=0
• BZ - 1724048 - Fail to migrate a rhel6.10-mt7.6 guest with dimm device
• BZ - 1734502 - qemu-kvm: backport cpuidle-haltpoll support
• BZ - 1734745 - CVE-2019-14378 QEMU: slirp: heap buffer overflow during packet reassembly
• BZ - 1743365 - qemu, qemu-img fail to detect alignment with XFS and Gluster/XFS on 4k block device
• BZ - 1746224 - qemu coredump: qemu-kvm: block/create.c:68: qmp_blockdev_create: Assertion `drv' failed
• BZ - 1764120 - [Data plane]virtio_scsi_ctx_check: Assertion `blk_get_aio_context(d->conf.blk) == s->ctx' failed when unplug a device that running block stream on it
• BZ - 1775251 - qemu-kvm crashes when Windows VM is migrated with multiqueue
• BZ - 1794290 - CVE-2020-1711 QEMU: block: iscsi: OOB heap access via an unexpected response of iSCSI Server

CVEs

• CVE-2019-12155
• CVE-2019-14378
• CVE-2020-1711

References

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