-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: qemu-kvm security update Advisory ID: RHSA-2018:1656-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:1656 Issue date: 2018-05-21 CVE Names: CVE-2018-3639 ===================================================================== 1. Summary: An update for qemu-kvm 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) - x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - 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): * 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. 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/): 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.4): Source: qemu-kvm-0.12.1.2-2.355.el6_4.11.src.rpm x86_64: qemu-guest-agent-0.12.1.2-2.355.el6_4.11.x86_64.rpm qemu-img-0.12.1.2-2.355.el6_4.11.x86_64.rpm qemu-kvm-0.12.1.2-2.355.el6_4.11.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.11.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.355.el6_4.11.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.4): x86_64: qemu-guest-agent-win32-0.12.1.2-2.355.el6_4.11.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.11.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-2018-3639 https://access.redhat.com/security/updates/classification/#important 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 iQIVAwUBWwQw/NzjgjWX9erEAQibHhAAnQB3w7HZPsbJL4CZmQ6RiV2jFetYREs4 3uKesj4cIVIg5J1LtGU7sr8HW6dObPGoaqUcTtufUJRGYeQ0K70HJBdnQp7uzG7E 8xR4IjPcYYlPXQKTkFSVRhSi70UMljLMrNKkSK0bx5SSTr6n9EDbgJ2NqqIUa/Se ltBHixPaMZsGF039djGCmTaeqzApL54KxbRS7ypC5FI2nM6CmGNpSTzL7g30lgVu ryb4IrmG6OeujXA6WYMRjR7/ELfZ/APQFBnZwY4SnBlO544mu6WT7dh2fqnOqZy4 7vfXvhw/S7BqhBW+YTh9dp+KKXaeU/GhIrdTtJ7G5eF2QC0wZp1NxHhq7CMN/ROE sj12U4EEZwn0/J+/DZu8eoXsDu8vA1u4JYr0fhDKlnGL1grkfHyzS83isTrelPkr Rug5Efss9YNrUlPJIjcvPRmGOBEwHev73PYGRbEq/T0BeLKK9w3aXJX35hfoSaCU yNCkR06oH4q8mvK1kIvwOdkZOiPhezYDz91PsCZ9W7TO0meOyb1OVSL3z5KfsnhT 95g3HETNqfAkzO4kh/CG63mlkdWpwU1r4+SnzV88iZcqZIR8d47Iy/2SwZhISIzu 0b3T1Jh1Tp3TlhX86gJa0GpzlpAz3Hs0vuULuSnQz02K7B6V56R/rRe+1IsqZR3H QDFk7cwzswg= =J81W -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce