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 7.4 Extended Update Support.

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)
  

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 for x86_64 - Extended Update Support 7.4 x86_64
• Red Hat Enterprise Linux Server - AUS 7.4 x86_64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.4 ppc64
• Red Hat Enterprise Linux EUS Compute Node 7.4 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.4 ppc64le
• Red Hat Enterprise Linux Server - TUS 7.4 x86_64
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.4 ppc64le
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.4 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 for x86_64 - Extended Update Support 7.4

SRPM
qemu-kvm-1.5.3-141.el7_4.7.src.rpm	SHA-256: 48a4cbc9edd9f9337cd447a106a55199b7f4dce235de4136824e4e39cb8e979c
x86_64
qemu-img-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: cbdf612a8d5d24b298a1b9f8c8566059dc73222198f1f79ba32b012e48ab8567
qemu-kvm-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: b87e8a8eb335ca58982ff849e8bfe84bda805de67430e7ec11aefff237283c2d
qemu-kvm-common-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: bbcaf9caae768837c6a7d3c40ae4b15ef2ee20f696c1228125ca07149a8063e5
qemu-kvm-debuginfo-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: 61b41cf41403c79413436a7971820aa4c4c3e5127eaca2b27260cbb9e50b1914
qemu-kvm-tools-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: c073e277ff6b3a9391d45d4b2879f8b474e7919f7a8fd8594d754ed0580d048f

Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.4

SRPM
qemu-kvm-1.5.3-141.el7_4.7.src.rpm	SHA-256: 48a4cbc9edd9f9337cd447a106a55199b7f4dce235de4136824e4e39cb8e979c
ppc64
qemu-img-1.5.3-141.el7_4.7.ppc64.rpm	SHA-256: a29c7a75602d7e1b57b2012c3cb673b4a5be80e07752eae40513a22c47c5c822
qemu-kvm-debuginfo-1.5.3-141.el7_4.7.ppc64.rpm	SHA-256: 86c95dfe20e923da9fd549550cd6d06f92a81ea769d8719e2b570013f5f26a53

Red Hat Enterprise Linux EUS Compute Node 7.4

SRPM
qemu-kvm-1.5.3-141.el7_4.7.src.rpm	SHA-256: 48a4cbc9edd9f9337cd447a106a55199b7f4dce235de4136824e4e39cb8e979c
x86_64
qemu-img-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: cbdf612a8d5d24b298a1b9f8c8566059dc73222198f1f79ba32b012e48ab8567
qemu-kvm-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: b87e8a8eb335ca58982ff849e8bfe84bda805de67430e7ec11aefff237283c2d
qemu-kvm-common-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: bbcaf9caae768837c6a7d3c40ae4b15ef2ee20f696c1228125ca07149a8063e5
qemu-kvm-debuginfo-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: 61b41cf41403c79413436a7971820aa4c4c3e5127eaca2b27260cbb9e50b1914
qemu-kvm-tools-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: c073e277ff6b3a9391d45d4b2879f8b474e7919f7a8fd8594d754ed0580d048f

Red Hat Enterprise Linux Server - AUS 7.4

SRPM
qemu-kvm-1.5.3-141.el7_4.7.src.rpm	SHA-256: 48a4cbc9edd9f9337cd447a106a55199b7f4dce235de4136824e4e39cb8e979c
x86_64
qemu-img-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: cbdf612a8d5d24b298a1b9f8c8566059dc73222198f1f79ba32b012e48ab8567
qemu-kvm-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: b87e8a8eb335ca58982ff849e8bfe84bda805de67430e7ec11aefff237283c2d
qemu-kvm-common-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: bbcaf9caae768837c6a7d3c40ae4b15ef2ee20f696c1228125ca07149a8063e5
qemu-kvm-debuginfo-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: 61b41cf41403c79413436a7971820aa4c4c3e5127eaca2b27260cbb9e50b1914
qemu-kvm-tools-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: c073e277ff6b3a9391d45d4b2879f8b474e7919f7a8fd8594d754ed0580d048f

Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.4

SRPM
qemu-kvm-1.5.3-141.el7_4.7.src.rpm	SHA-256: 48a4cbc9edd9f9337cd447a106a55199b7f4dce235de4136824e4e39cb8e979c
ppc64le
qemu-img-1.5.3-141.el7_4.7.ppc64le.rpm	SHA-256: 0b041ecbc9b9a96c81fba3aa4af9e0fbd4ad81bfb71970646a8791e5858832db
qemu-kvm-debuginfo-1.5.3-141.el7_4.7.ppc64le.rpm	SHA-256: 8cebebd95125e8c0e7405fade7f40b9ea873694aba831496d876ff8a492656cd

Red Hat Enterprise Linux Server - TUS 7.4

SRPM
qemu-kvm-1.5.3-141.el7_4.7.src.rpm	SHA-256: 48a4cbc9edd9f9337cd447a106a55199b7f4dce235de4136824e4e39cb8e979c
x86_64
qemu-img-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: cbdf612a8d5d24b298a1b9f8c8566059dc73222198f1f79ba32b012e48ab8567
qemu-kvm-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: b87e8a8eb335ca58982ff849e8bfe84bda805de67430e7ec11aefff237283c2d
qemu-kvm-common-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: bbcaf9caae768837c6a7d3c40ae4b15ef2ee20f696c1228125ca07149a8063e5
qemu-kvm-debuginfo-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: 61b41cf41403c79413436a7971820aa4c4c3e5127eaca2b27260cbb9e50b1914
qemu-kvm-tools-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: c073e277ff6b3a9391d45d4b2879f8b474e7919f7a8fd8594d754ed0580d048f

Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.4

SRPM
qemu-kvm-1.5.3-141.el7_4.7.src.rpm	SHA-256: 48a4cbc9edd9f9337cd447a106a55199b7f4dce235de4136824e4e39cb8e979c
ppc64le
qemu-img-1.5.3-141.el7_4.7.ppc64le.rpm	SHA-256: 0b041ecbc9b9a96c81fba3aa4af9e0fbd4ad81bfb71970646a8791e5858832db
qemu-kvm-debuginfo-1.5.3-141.el7_4.7.ppc64le.rpm	SHA-256: 8cebebd95125e8c0e7405fade7f40b9ea873694aba831496d876ff8a492656cd

Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.4

SRPM
qemu-kvm-1.5.3-141.el7_4.7.src.rpm	SHA-256: 48a4cbc9edd9f9337cd447a106a55199b7f4dce235de4136824e4e39cb8e979c
x86_64
qemu-img-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: cbdf612a8d5d24b298a1b9f8c8566059dc73222198f1f79ba32b012e48ab8567
qemu-kvm-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: b87e8a8eb335ca58982ff849e8bfe84bda805de67430e7ec11aefff237283c2d
qemu-kvm-common-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: bbcaf9caae768837c6a7d3c40ae4b15ef2ee20f696c1228125ca07149a8063e5
qemu-kvm-debuginfo-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: 61b41cf41403c79413436a7971820aa4c4c3e5127eaca2b27260cbb9e50b1914
qemu-kvm-tools-1.5.3-141.el7_4.7.x86_64.rpm	SHA-256: c073e277ff6b3a9391d45d4b2879f8b474e7919f7a8fd8594d754ed0580d048f