-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel-rt security update Advisory ID: RHSA-2019:1174-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1174 Issue date: 2019-05-14 CVE Names: CVE-2018-12126 CVE-2018-12127 CVE-2018-12130 CVE-2019-11091 ===================================================================== 1. Summary: An update for kernel-rt is now available for Red Hat Enterprise Linux 8. 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 Real Time (v. 8) - x86_64 Red Hat Enterprise Linux Real Time for NFV (v. 8) - x86_64 3. Description: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. 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 The system must be rebooted 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 Real Time for NFV (v. 8): Source: kernel-rt-4.18.0-80.1.2.rt9.145.el8_0.src.rpm x86_64: kernel-rt-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-core-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-core-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-devel-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-kvm-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-kvm-debuginfo-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-modules-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debuginfo-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-devel-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-kvm-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-kvm-debuginfo-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-modules-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-modules-extra-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm Red Hat Enterprise Linux Real Time (v. 8): Source: kernel-rt-4.18.0-80.1.2.rt9.145.el8_0.src.rpm x86_64: kernel-rt-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-core-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-core-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-devel-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-kvm-debuginfo-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-modules-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debuginfo-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-devel-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-kvm-debuginfo-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-modules-4.18.0-80.1.2.rt9.145.el8_0.x86_64.rpm kernel-rt-modules-extra-4.18.0-80.1.2.rt9.145.el8_0.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/updates/classification/#important https://access.redhat.com/security/vulnerabilities/mds 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 iQIVAwUBXNsFi9zjgjWX9erEAQj+ww/9HipX1erzLSDNX2bDQFif2XbX8YESmckq JmPC1PbC2k8bKCbBW7WXxUK35hxaJdAOH4PDdczba9mh5kS7yTmFc8MM5Cjs8u6w 70tbP7eF410mwLJvsHP5sSkUneENZovlWWwO55YWjCYw3pUHebQhpjpOM2TWi02i 2paIT6FmB6dWedc6fvsG7cFJrkkhGnzwojtvyVhsZ3Bd/5L2rS5zpcVaE5nq82Nn fSQKmzMq4rzJvkdjDTsVPuTONVUPsFPGp6P1oc7bi+NGdPl+WMUxfgat7HacvNVQ fH7F34dFd/347TghoNeWWHgIyw6QPqBn0/b36wtOEyZvnLK9Z2teUXRyuLguGZWj oZvloV1g1kf4b9vFygFcwWdzE49dfIotwntg9YEu2UcZdmMa3QgwNSSEtBqR9ERB x+Pd3yKjorzp1I/E/N1jeHgqNB4vWaS9VCJZJh6GaQ9wSy9aXl5TdypJoLcPoS0u 3tODnfMRzQ1STmw0ulj2upi7tJdvpp+jHszHT8iz7NVgZrVM/uBEIUTmVgNUu6vX +yYRoZ9R2XEiTJ5mw6EpTxEZ5jei9WP8hG73js9CPmdyGxYSH4tR/D1Z21AJjGvq c22fowGvpAi9yNIxv3yBM0tQLwYghOu4uFFhUOVD2QKa9vy5NItLp5zXyGXjxiym +WYbmUS4ftc= =x/cg -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce