-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: qemu-kvm security update Advisory ID: RHSA-2019:1198-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1198 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 6.5 Advanced 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 Server AUS (v. 6.5) - 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 Server AUS (v. 6.5): Source: qemu-kvm-0.12.1.2-2.415.el6_5.20.src.rpm x86_64: qemu-guest-agent-0.12.1.2-2.415.el6_5.20.x86_64.rpm qemu-img-0.12.1.2-2.415.el6_5.20.x86_64.rpm qemu-kvm-0.12.1.2-2.415.el6_5.20.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.415.el6_5.20.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.415.el6_5.20.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 iQIVAwUBXNsdA9zjgjWX9erEAQgqSw//ed9RF4Za70zili6aw2+DPwUTEBU7SEhH nI2JihF1MgpEgLBVLgZ86MPz9de55UvoP1xrlIBOU2rAnuF+59Imh1LddKifh2le OWCwomuqCXgZ0i5AhQ2HrFGHnBQEyFATOw5hHjgVriUZDXI2nUgRGhSa/WrXko8b t1ryxDZFhffnL7pgTjNyJlPL9qFU8b5d9i8JtOOycChiXIlRMq9gOKz1YVR1JbsR FTSxmEQoWGTzFddBQFsFwiBs27/x2ZDFZXOuKK9BdjZK1rv8jz7Omd726/kiAsXP 5+WsnaIvLiL4D7xUeXHFJ4wVRt8e0EDSk6zm4WX1nOD7QE7JQqM0FGm8hwOVTTqz 6aenHtkQf4Bx5OVnP3baHJ7cs8/xwnuYTBqLSLOhUUafjn6IMRdIOJJqAAD76oTi S2gTAeV1JRsXpxDPs4lsBq3wSqFc3rXrxyzBZ5M/w/Gt0cm9XkXmtz42fwqSUArP iDRYALsOOFYIdskhYUtVN7XemVhhAhCHtvuklr9kjDDmCFY0Eqxa+c2D3VAiNigC tynxWM8J3IYHT6dUBVXvXYDPAEBe54j3uJ1p6dj32wrPNdiuFQsFt/HC7s/JJ4wc rXlMnIaDzL/fC1PUIuv+yu3hn2v3v5hLhI2qkzegVWL03U5GYhfWwVWMxPPRHUhJ HKZLa/p7SGY= =U/2C -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce