-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: qemu-kvm security update Advisory ID: RHSA-2019:1183-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1183 Issue date: 2019-05-14 CVE Names: CVE-2018-12126 CVE-2018-12127 CVE-2018-12130 CVE-2019-11091 ===================================================================== 1. Summary: An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.5 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. 2. Relevant releases/architectures: Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.5) - x86_64 3. 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): * A flaw was found in the implementation of the "fill buffer", a mechanism used by modern CPUs when a cache-miss is made on L1 CPU cache. If an attacker can generate a load operation that would create a page fault, the execution will continue speculatively with incorrect data from the fill buffer while the data is fetched from higher level caches. This response time can be measured to infer data in the fill buffer. (CVE-2018-12130) * Modern Intel microprocessors implement hardware-level micro-optimizations to improve the performance of writing data back to CPU caches. The write operation is split into STA (STore Address) and STD (STore Data) sub-operations. These sub-operations allow the processor to hand-off address generation logic into these sub-operations for optimized writes. Both of these sub-operations write to a shared distributed processor structure called the 'processor store buffer'. As a result, an unprivileged attacker could use this flaw to read private data resident within the CPU's processor store buffer. (CVE-2018-12126) * Microprocessors use a ‘load port’ subcomponent to perform load operations from memory or IO. During a load operation, the load port receives data from the memory or IO subsystem and then provides the data to the CPU registers and operations in the CPU’s pipelines. Stale load operations results are stored in the 'load port' table until overwritten by newer operations. Certain load-port operations triggered by an attacker can be used to reveal data about previous stale requests leaking data back to the attacker via a timing side-channel. (CVE-2018-12127) * Uncacheable memory on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access. (CVE-2019-11091) 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. 4. 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. 5. Bugs fixed (https://bugzilla.redhat.com/): 1646781 - CVE-2018-12126 hardware: Microarchitectural Store Buffer Data Sampling (MSBDS) 1646784 - CVE-2018-12130 hardware: Microarchitectural Fill Buffer Data Sampling (MFBDS) 1667782 - CVE-2018-12127 hardware: Micro-architectural Load Port Data Sampling - Information Leak (MLPDS) 1705312 - CVE-2019-11091 hardware: Microarchitectural Data Sampling Uncacheable Memory (MDSUM) 6. Package List: Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5): Source: qemu-kvm-1.5.3-156.el7_5.7.src.rpm x86_64: qemu-img-1.5.3-156.el7_5.7.x86_64.rpm qemu-kvm-1.5.3-156.el7_5.7.x86_64.rpm qemu-kvm-common-1.5.3-156.el7_5.7.x86_64.rpm qemu-kvm-debuginfo-1.5.3-156.el7_5.7.x86_64.rpm qemu-kvm-tools-1.5.3-156.el7_5.7.x86_64.rpm Red Hat Enterprise Linux Server EUS (v. 7.5): Source: qemu-kvm-1.5.3-156.el7_5.7.src.rpm x86_64: qemu-img-1.5.3-156.el7_5.7.x86_64.rpm qemu-kvm-1.5.3-156.el7_5.7.x86_64.rpm qemu-kvm-common-1.5.3-156.el7_5.7.x86_64.rpm qemu-kvm-debuginfo-1.5.3-156.el7_5.7.x86_64.rpm qemu-kvm-tools-1.5.3-156.el7_5.7.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2018-12126 https://access.redhat.com/security/cve/CVE-2018-12127 https://access.redhat.com/security/cve/CVE-2018-12130 https://access.redhat.com/security/cve/CVE-2019-11091 https://access.redhat.com/security/vulnerabilities/mds https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2019 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBXNsS4dzjgjWX9erEAQjfPBAAnNwGdwl321jDPgtHVWSwyRamhK7QHDOl nNr8pdhw8GpTQuClgLBlwfvm8p3tjJg02r2CurlOLvuv0ykklVyTvpAZuG7GQkON 2vDkImKnYP338mTAnvSBiaAEUEBmRA7UaOJe0wZd3lGUs7HZtNolwrbyXkVP1apO VquT5l/TCdOkq3Z/Oud8F/ZulGvPNcvmOPY6rMnfxBeMR/pwG91JRUihv55JzrbH xoZfwKyL8bjtcgWkkB+6i8kxQp1DKps/E5q5StQ1f56F2DBEIhtGGonf4NtHt592 ozzmO1WaFLz62mAJmjKAuD5XEQzbE3WV295CRzj9FdZjWI8mRDlgWWbDSE7ecbv/ YiriSZrEkwsA2yvRW/zFSrIaXXZrQThr9iIOpDomExFgG0f9RvSnz3hI3tcsRk+m oB977FWlI3rZJYozctEtzMpXqYUk4d0na9Ft29I+N4lFfLrydKa0f2vG2eqaoUgD j7ljTTWjgJ+0sc9Kih4hnxDnewx85sQdYq285hNZKbCpfn7shBPYZf5cJAOZ2gsj V8IRe7qcj5o3+smfwkyliWgfslmJei4pt7nceD325VYtvkQSp85nulqzEDnTwC6A 4gQP6eD0ozCrxklOCx8VO7HXCx4RIc2zNddKEqLZVGUc1DgJcODmtj54fQfCTawd Igx3437oqQw= =nwTG -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce