-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel security update Advisory ID: RHSA-2018:2394-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:2394 Issue date: 2018-08-14 CVE Names: CVE-2018-3620 CVE-2018-3639 CVE-2018-3646 CVE-2018-10901 ==================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6.4 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. 6.4) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * Modern operating systems implement virtualization of physical memory to efficiently use available system resources and provide inter-domain protection through access control and isolation. The L1TF issue was found in the way the x86 microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimisation) in combination with handling of page-faults caused by terminated virtual to physical address resolving process. As a result, an unprivileged attacker could use this flaw to read privileged memory of the kernel or other processes and/or cross guest/host boundaries to read host memory by conducting targeted cache side-channel attacks. (CVE-2018-3620, CVE-2018-3646) * 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) * kernel: kvm: vmx: host GDT limit corruption (CVE-2018-10901) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646; Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639; and Vegard Nossum (Oracle Corporation) for reporting CVE-2018-10901. 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/): 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass 1585005 - CVE-2018-3646 Kernel: hw: cpu: L1 terminal fault (L1TF) 1601849 - CVE-2018-10901 kernel: kvm: vmx: host GDT limit corruption 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.4): Source: kernel-2.6.32-358.91.4.el6.src.rpm noarch: kernel-doc-2.6.32-358.91.4.el6.noarch.rpm kernel-firmware-2.6.32-358.91.4.el6.noarch.rpm x86_64: kernel-2.6.32-358.91.4.el6.x86_64.rpm kernel-debug-2.6.32-358.91.4.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm kernel-debug-devel-2.6.32-358.91.4.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.91.4.el6.x86_64.rpm kernel-devel-2.6.32-358.91.4.el6.x86_64.rpm kernel-headers-2.6.32-358.91.4.el6.x86_64.rpm perf-2.6.32-358.91.4.el6.x86_64.rpm perf-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.4): Source: kernel-2.6.32-358.91.4.el6.src.rpm x86_64: kernel-debug-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.91.4.el6.x86_64.rpm perf-debuginfo-2.6.32-358.91.4.el6.x86_64.rpm python-perf-2.6.32-358.91.4.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.91.4.el6.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-2018-3620 https://access.redhat.com/security/cve/CVE-2018-3639 https://access.redhat.com/security/cve/CVE-2018-3646 https://access.redhat.com/security/cve/CVE-2018-10901 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/L1TF https://access.redhat.com/security/vulnerabilities/ssbd 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2018 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBW3M5ANzjgjWX9erEAQi7Rg//U7QxrGbqw1qaQ7vzix5cCHiVCmynWZN1 vmDtMlhJYs4E2xTJkPo8IxuHjry1GMwznyZLmfssHsoPVBuifuv+X9nkwoEw4V2P reRegGKBEgGHhQgpoU9yHtmPqhVrqUGU8bMR+ZXnLHvwYp4QfaG647WQ0hrxSGzV FzA7QgNSFK4eyQ8mJJIPKc76KxjGPV3YEb2hI4BnOxXdJ2w6OKvPFT24LBTdF1+0 rx/nikOg6kDGI6CS6YJMIwLZuAT10ZMxtQFbmO32SBwlf1zri6Wsi1GwJHyb5zjt Pf/a0U6A4aCQ2n7BDpugwrK+xvdNwbTwplNclEjI6xS175M7QeFNO13fp9kF2Cf4 iyGootCwQbFDCh6KUqUeNh3hbC4R3eS87+3EaPOe4ks+qfUZdTyXAESRA8LR56Of mVo1gL275KJW5Z53DcX+w+oC631RYk4LUCFbGOeIcSH5BL4F0ZQge/LIjczQAsyY myYfK7kD8heSBMHRTgALoZCOGHHe0Wk82k2epM0y9UW7Uf8xEqdcV5N6XMNlqG/B dyGZK9bfuvZXnyztpZTd4cZiDRCS9AepXUojaAfw3HXhcxgsXTRF/yP7pk5s+w1f dC1Z0WhDHgQTqG0IMm00elqSecAQVwF3YeuypWu0/G067jYLWrImnkdHKUlSgh8n 1CmHjAFZ/CU=iVxl -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce