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 7.2 Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions.

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):

• An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639 virt-ssbd AMD)
  

Note: This is the qemu-kvm side of the CVE-2018-3639 mitigation.

Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.

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 - AUS 7.2 x86_64
• Red Hat Enterprise Linux Server - TUS 7.2 x86_64
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.2 x86_64

Fixes

• BZ - 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass

CVEs

• CVE-2018-3639

References

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

Red Hat Enterprise Linux Server - AUS 7.2

SRPM
qemu-kvm-1.5.3-105.el7_2.18.src.rpm	SHA-256: 3ba4c708722618db248783c65cd1cf2ca704535930ce678653f9a806f4249529
x86_64
libcacard-1.5.3-105.el7_2.18.i686.rpm	SHA-256: 0f042b9a63720f8e216cabf9b1fec04990ad7be96493fef832c25b9ace36c3c2
libcacard-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 067acaf92b615fc85872e7e76bb5af3b1ca8ff68c4fc46a9f8e6fee4e81457b3
libcacard-devel-1.5.3-105.el7_2.18.i686.rpm	SHA-256: c779f4bda217cddfeb6241af431308dd06925d0714f6d782375cf7da3edd97b0
libcacard-devel-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: f05b545fecdd0869cd0356310a009b63b7815cb310277ba4f11b1b06838d8417
libcacard-tools-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 0f62fe236c75f84a2d3cff31764d5634c5cb3703c0df9891be2c92a56c659981
qemu-img-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 8c43d983380e654a87c298d7acf0c4d603c975fcbf7d8c525fc612386f0b889c
qemu-kvm-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 478d875077029ee1c6f9a22d3f33ab920fa1d0a7d7ad76f3cef69e33f7439ccc
qemu-kvm-common-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 29de2378e6b9d8b33640a426f8476e7bf3345bf0a3706fa46bbbfbce08dbf178
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.i686.rpm	SHA-256: 436e4d41443d8d58426dc6ecd3621e9afa25add740042eb1b390f8977a3e2440
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.i686.rpm	SHA-256: 436e4d41443d8d58426dc6ecd3621e9afa25add740042eb1b390f8977a3e2440
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 15e85fac330998804585c7f80561c38d54590b6aecf11e00a14ac73a63c0e46b
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 15e85fac330998804585c7f80561c38d54590b6aecf11e00a14ac73a63c0e46b
qemu-kvm-tools-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 03db9076bacab89068cb699086faa3cd1868a2f5563e182333ee882b319d6362

Red Hat Enterprise Linux Server - TUS 7.2

SRPM
qemu-kvm-1.5.3-105.el7_2.18.src.rpm	SHA-256: 3ba4c708722618db248783c65cd1cf2ca704535930ce678653f9a806f4249529
x86_64
libcacard-1.5.3-105.el7_2.18.i686.rpm	SHA-256: 0f042b9a63720f8e216cabf9b1fec04990ad7be96493fef832c25b9ace36c3c2
libcacard-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 067acaf92b615fc85872e7e76bb5af3b1ca8ff68c4fc46a9f8e6fee4e81457b3
libcacard-devel-1.5.3-105.el7_2.18.i686.rpm	SHA-256: c779f4bda217cddfeb6241af431308dd06925d0714f6d782375cf7da3edd97b0
libcacard-devel-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: f05b545fecdd0869cd0356310a009b63b7815cb310277ba4f11b1b06838d8417
libcacard-tools-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 0f62fe236c75f84a2d3cff31764d5634c5cb3703c0df9891be2c92a56c659981
qemu-img-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 8c43d983380e654a87c298d7acf0c4d603c975fcbf7d8c525fc612386f0b889c
qemu-kvm-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 478d875077029ee1c6f9a22d3f33ab920fa1d0a7d7ad76f3cef69e33f7439ccc
qemu-kvm-common-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 29de2378e6b9d8b33640a426f8476e7bf3345bf0a3706fa46bbbfbce08dbf178
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.i686.rpm	SHA-256: 436e4d41443d8d58426dc6ecd3621e9afa25add740042eb1b390f8977a3e2440
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.i686.rpm	SHA-256: 436e4d41443d8d58426dc6ecd3621e9afa25add740042eb1b390f8977a3e2440
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 15e85fac330998804585c7f80561c38d54590b6aecf11e00a14ac73a63c0e46b
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 15e85fac330998804585c7f80561c38d54590b6aecf11e00a14ac73a63c0e46b
qemu-kvm-tools-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 03db9076bacab89068cb699086faa3cd1868a2f5563e182333ee882b319d6362

Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.2

SRPM
qemu-kvm-1.5.3-105.el7_2.18.src.rpm	SHA-256: 3ba4c708722618db248783c65cd1cf2ca704535930ce678653f9a806f4249529
x86_64
libcacard-1.5.3-105.el7_2.18.i686.rpm	SHA-256: 0f042b9a63720f8e216cabf9b1fec04990ad7be96493fef832c25b9ace36c3c2
libcacard-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 067acaf92b615fc85872e7e76bb5af3b1ca8ff68c4fc46a9f8e6fee4e81457b3
libcacard-devel-1.5.3-105.el7_2.18.i686.rpm	SHA-256: c779f4bda217cddfeb6241af431308dd06925d0714f6d782375cf7da3edd97b0
libcacard-devel-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: f05b545fecdd0869cd0356310a009b63b7815cb310277ba4f11b1b06838d8417
libcacard-tools-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 0f62fe236c75f84a2d3cff31764d5634c5cb3703c0df9891be2c92a56c659981
qemu-img-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 8c43d983380e654a87c298d7acf0c4d603c975fcbf7d8c525fc612386f0b889c
qemu-kvm-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 478d875077029ee1c6f9a22d3f33ab920fa1d0a7d7ad76f3cef69e33f7439ccc
qemu-kvm-common-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 29de2378e6b9d8b33640a426f8476e7bf3345bf0a3706fa46bbbfbce08dbf178
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.i686.rpm	SHA-256: 436e4d41443d8d58426dc6ecd3621e9afa25add740042eb1b390f8977a3e2440
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.i686.rpm	SHA-256: 436e4d41443d8d58426dc6ecd3621e9afa25add740042eb1b390f8977a3e2440
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 15e85fac330998804585c7f80561c38d54590b6aecf11e00a14ac73a63c0e46b
qemu-kvm-debuginfo-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 15e85fac330998804585c7f80561c38d54590b6aecf11e00a14ac73a63c0e46b
qemu-kvm-tools-1.5.3-105.el7_2.18.x86_64.rpm	SHA-256: 03db9076bacab89068cb699086faa3cd1868a2f5563e182333ee882b319d6362