RHSA-2021:1762 - Security Advisory

Topic

An update for the virt:rhel and virt-devel:rhel modules is now available for Red Hat Enterprise Linux 8.

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.

Description

Kernel-based Virtual Machine (KVM) offers a full virtualization solution for Linux on numerous hardware platforms. The virt:rhel module contains packages which provide user-space components used to run virtual machines using KVM. The packages also provide APIs for managing and interacting with the virtualized systems.

Security Fix(es):

• libvirt: double free in qemuAgentGetInterfaces() in qemu_agent.c (CVE-2020-25637)
• QEMU: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c (CVE-2020-27821)
• QEMU: ide: atapi: OOB access while processing read commands (CVE-2020-29443)
• QEMU: heap buffer overflow in iscsi_aio_ioctl_cb() in block/iscsi.c may lead to information disclosure (CVE-2020-11947)
• QEMU: reachable assertion failure in net_tx_pkt_add_raw_fragment() in hw/net/net_tx_pkt.c (CVE-2020-16092)
• QEMU: infinite loop in e1000e_write_packet_to_guest() in hw/net/e1000e_core.c (CVE-2020-25707)
• QEMU: assertion failure through usb_packet_unmap() in hw/usb/hcd-ehci.c (CVE-2020-25723)
• QEMU: e1000e: infinite loop scenario in case of null packet descriptor (CVE-2020-28916)
• QEMU: slirp: out-of-bounds access while processing ARP/NCSI packets (CVE-2020-29129, CVE-2020-29130)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from 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

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for x86_64 8 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 8 s390x

Fixes

• BZ - 1384241 - The tar-in command does not allow restoring file capabilities
• BZ - 1798463 - cpu.shares for existing scopes under machine.slice are reset to default when creating a new scope after daemon-reload
• BZ - 1828952 - virt-customize --selinux-relabel (and other tools) do not work if SELINUXTYPE != targeted
• BZ - 1834281 - qemu-img convert abort when converting image with unaligned size
• BZ - 1837495 - [detach-device][s390x] can't detach virtio interface device by its address only (no mac)
• BZ - 1843852 - qemu core dumped: qemu-kvm: /builddir/build/BUILD/qemu-4.2.0/memory.c:1928: memory_region_notify_one: Assertion `entry->iova >= notifier->start && entry_end <= notifier->end' failed.
• BZ - 1846975 - Failed to boot up a s390x guest with virtio-blk-ccw if attaching a virtio-scsi-ccw bus in previous
• BZ - 1850680 - hypervisor-cpu-compare raises internal error for host-passthrough cpu model
• BZ - 1859494 - Report logical_name for disks without mounted file-system
• BZ - 1860283 - CVE-2020-16092 QEMU: reachable assertion failure in net_tx_pkt_add_raw_fragment() in hw/net/net_tx_pkt.c
• BZ - 1872854 - move the glusterfs dependency out of qemu-kvm-core to the glusterfs module
• BZ - 1874304 - nwfilter fails trying to bind/unbind rules for tap device that was/is in use by a different domain
• BZ - 1874780 - -prom-env does not validate input
• BZ - 1876297 - Setting "ramfb='on'" in the mdev device does not save in the guest xml and only works once
• BZ - 1876742 - libvirtd[32318]: internal error: Invalid unsigned integer value '-1' in file '/sys/devices/system/cpu/cpu0/topology/die_id'
• BZ - 1880418 - Regression: migration: unable to find any master var store for loader
• BZ - 1880546 - qemu use SCMP_ACT_TRAP even SCMP_ACT_KILL_PROCESS is available
• BZ - 1881037 - CVE-2020-25637 libvirt: double free in qemuAgentGetInterfaces() in qemu_agent.c
• BZ - 1884531 - qemu-ga aborts after guest-shutdown command
• BZ - 1893895 - CVE-2020-25707 QEMU: infinite loop in e1000e_write_packet_to_guest() in hw/net/e1000e_core.c
• BZ - 1898579 - CVE-2020-25723 QEMU: assertion failure through usb_packet_unmap() in hw/usb/hcd-ehci.c
• BZ - 1901837 - Failed to hotunplug pc-dimm device
• BZ - 1902231 - CVE-2020-29129 CVE-2020-29130 QEMU: slirp: out-of-bounds access while processing ARP/NCSI packets
• BZ - 1902651 - CVE-2020-27821 QEMU: heap buffer overflow in msix_table_mmio_write() in hw/pci/msix.c
• BZ - 1902960 - QEMU doesn't honour system crypto policies
• BZ - 1903064 - CVE-2020-28916 QEMU: e1000e: infinite loop scenario in case of null packet descriptor
• BZ - 1910220 - qemu-ga service still active and can work after qemu-guest-agent been removed
• BZ - 1910267 - There is no soft link '/etc/qemu-kvm/fsfreeze-hook'
• BZ - 1910326 - Incorrect hostname returned by qga command 'guest-get-host-name'
• BZ - 1912765 - CVE-2020-11947 QEMU: heap buffer overflow in iscsi_aio_ioctl_cb() in block/iscsi.c may lead to information disclosure
• BZ - 1917446 - CVE-2020-29443 QEMU: ide: atapi: OOB access while processing read commands
• BZ - 1918708 - Support Link non uplink representors to PCI device

CVEs

• CVE-2020-11947
• CVE-2020-16092
• CVE-2020-25637
• CVE-2020-25707
• CVE-2020-25723
• CVE-2020-27821
• CVE-2020-28916
• CVE-2020-29129
• CVE-2020-29130
• CVE-2020-29443

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/