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)
  

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_2.17.src.rpm	SHA-256: eec699ced7f2f4e4bb56a913e85bc89f3a97b503f8109c55c98623856c9e115f
x86_64
libcacard-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 5451a512a02f604c0a383afb9008575b998153b70cb211ea46b5266bea048bdb
libcacard-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: b2f532abc7c3105078e4e483bce8403c16a6643dace3b1e6b2a3df32e11ae7e5
libcacard-devel-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 1cded58d39edc99e4449a43445af58dac62fdcc0e31a0738895207e0872fc05c
libcacard-devel-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 8b0d441dce03fdd2be4403d600e19c78d7bb8d4b86993563e8bbb60bebdc0775
libcacard-tools-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 7a13464a4e19c007ec0398e1ff565a0c24e167329d60c9b131ebb59c43029ea5
qemu-img-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 05a74c50ce9285e3509f6cf6f3f4ba4c0c2cc36cc3c3832c6f5e6390621e1702
qemu-kvm-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 9f50aa6412da72164de32450965e171516787613fe2a8c10e920d6f01bf38c17
qemu-kvm-common-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 483079cac08bd572a0b48705e3d53b1e200941ffbfffd75ffb2a4b5afa6d1e70
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 1454e53d99121a6c111e4146eef7b363e2e9fc4c386125e083e4d58b5eb4a3f1
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 1454e53d99121a6c111e4146eef7b363e2e9fc4c386125e083e4d58b5eb4a3f1
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: c49a18725408f661e947337af161f098a3441c1fff9cebb3b942e611c77ba65c
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: c49a18725408f661e947337af161f098a3441c1fff9cebb3b942e611c77ba65c
qemu-kvm-tools-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 7d2f877a15ed895ec4444f0998725c81fb85b8059bdad65e902b0f84141d3195

Red Hat Enterprise Linux Server - TUS 7.2

SRPM
qemu-kvm-1.5.3-105.el7_2.17.src.rpm	SHA-256: eec699ced7f2f4e4bb56a913e85bc89f3a97b503f8109c55c98623856c9e115f
x86_64
libcacard-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 5451a512a02f604c0a383afb9008575b998153b70cb211ea46b5266bea048bdb
libcacard-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: b2f532abc7c3105078e4e483bce8403c16a6643dace3b1e6b2a3df32e11ae7e5
libcacard-devel-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 1cded58d39edc99e4449a43445af58dac62fdcc0e31a0738895207e0872fc05c
libcacard-devel-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 8b0d441dce03fdd2be4403d600e19c78d7bb8d4b86993563e8bbb60bebdc0775
libcacard-tools-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 7a13464a4e19c007ec0398e1ff565a0c24e167329d60c9b131ebb59c43029ea5
qemu-img-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 05a74c50ce9285e3509f6cf6f3f4ba4c0c2cc36cc3c3832c6f5e6390621e1702
qemu-kvm-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 9f50aa6412da72164de32450965e171516787613fe2a8c10e920d6f01bf38c17
qemu-kvm-common-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 483079cac08bd572a0b48705e3d53b1e200941ffbfffd75ffb2a4b5afa6d1e70
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 1454e53d99121a6c111e4146eef7b363e2e9fc4c386125e083e4d58b5eb4a3f1
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 1454e53d99121a6c111e4146eef7b363e2e9fc4c386125e083e4d58b5eb4a3f1
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: c49a18725408f661e947337af161f098a3441c1fff9cebb3b942e611c77ba65c
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: c49a18725408f661e947337af161f098a3441c1fff9cebb3b942e611c77ba65c
qemu-kvm-tools-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 7d2f877a15ed895ec4444f0998725c81fb85b8059bdad65e902b0f84141d3195

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

SRPM
qemu-kvm-1.5.3-105.el7_2.17.src.rpm	SHA-256: eec699ced7f2f4e4bb56a913e85bc89f3a97b503f8109c55c98623856c9e115f
x86_64
libcacard-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 5451a512a02f604c0a383afb9008575b998153b70cb211ea46b5266bea048bdb
libcacard-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: b2f532abc7c3105078e4e483bce8403c16a6643dace3b1e6b2a3df32e11ae7e5
libcacard-devel-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 1cded58d39edc99e4449a43445af58dac62fdcc0e31a0738895207e0872fc05c
libcacard-devel-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 8b0d441dce03fdd2be4403d600e19c78d7bb8d4b86993563e8bbb60bebdc0775
libcacard-tools-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 7a13464a4e19c007ec0398e1ff565a0c24e167329d60c9b131ebb59c43029ea5
qemu-img-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 05a74c50ce9285e3509f6cf6f3f4ba4c0c2cc36cc3c3832c6f5e6390621e1702
qemu-kvm-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 9f50aa6412da72164de32450965e171516787613fe2a8c10e920d6f01bf38c17
qemu-kvm-common-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 483079cac08bd572a0b48705e3d53b1e200941ffbfffd75ffb2a4b5afa6d1e70
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 1454e53d99121a6c111e4146eef7b363e2e9fc4c386125e083e4d58b5eb4a3f1
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.i686.rpm	SHA-256: 1454e53d99121a6c111e4146eef7b363e2e9fc4c386125e083e4d58b5eb4a3f1
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: c49a18725408f661e947337af161f098a3441c1fff9cebb3b942e611c77ba65c
qemu-kvm-debuginfo-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: c49a18725408f661e947337af161f098a3441c1fff9cebb3b942e611c77ba65c
qemu-kvm-tools-1.5.3-105.el7_2.17.x86_64.rpm	SHA-256: 7d2f877a15ed895ec4444f0998725c81fb85b8059bdad65e902b0f84141d3195