-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security update Advisory ID: RHSA-2018:1641-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:1641 Issue date: 2018-05-29 CVE Names: CVE-2018-3639 ===================================================================== 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): * 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 issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software side of the mitigation for this hardware issue. To be fully functional, up-to-date CPU microcode applied on the system is required. Please refer to References section for further information about this issue, CPU microcode requirements and the potential performance impact. 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 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 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.4): Source: kernel-2.6.32-358.88.4.el6.src.rpm noarch: kernel-doc-2.6.32-358.88.4.el6.noarch.rpm kernel-firmware-2.6.32-358.88.4.el6.noarch.rpm x86_64: kernel-2.6.32-358.88.4.el6.x86_64.rpm kernel-debug-2.6.32-358.88.4.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-358.88.4.el6.x86_64.rpm kernel-debug-devel-2.6.32-358.88.4.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.88.4.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.88.4.el6.x86_64.rpm kernel-devel-2.6.32-358.88.4.el6.x86_64.rpm kernel-headers-2.6.32-358.88.4.el6.x86_64.rpm perf-2.6.32-358.88.4.el6.x86_64.rpm perf-debuginfo-2.6.32-358.88.4.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.88.4.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.4): Source: kernel-2.6.32-358.88.4.el6.src.rpm x86_64: kernel-debug-debuginfo-2.6.32-358.88.4.el6.x86_64.rpm kernel-debuginfo-2.6.32-358.88.4.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-358.88.4.el6.x86_64.rpm perf-debuginfo-2.6.32-358.88.4.el6.x86_64.rpm python-perf-2.6.32-358.88.4.el6.x86_64.rpm python-perf-debuginfo-2.6.32-358.88.4.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-2018-3639 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 iQIVAwUBWw2AStzjgjWX9erEAQhyYQ//QidD8wWjAMQSePDf+qpJdzMi0s5mVcyF cT5Xd3+1sgSq3mJYjsmlLrAqJVF8HHbhfd4mc5oCdkoGOEORX7EphgkerJGNA9WE xmxnD3OLtbTnXZ1hrQOMMHtj75kXI8TSnDfn7z6tw7fjEyplkQrjxmFgeGqMkK4i V1MKx8MNE/hQO/TbDvUsjt4qqJCFEHtESkaCi8r2HHO69jQRI6lGX8LcGVEtrxue 7yq0tMm3Mw5R9W/raf/t0hUepxSiVqYU5YBT3R1WJc6R4+U2l3fCwWj+5NNK93fG 8wGsZQJPdzelOPUkPLSrsyhRIaj16aGDhsNc5xJ4VW+Vd6qIbO4DD/76QM6yQJuB lb+ivhtnUgcJ8dXhg6olVNFxt1UCyUqZoywIdAmNXBvR7eprAUjc/iv6jjTHmhHz N2H0cq2w4WC6+HsgjAiejXjjgLkEMyrlgaIaSiLeMJ4rz0/DHe8+DVQLJk4+8d8c CuCIrCEOauM1Tdfpmd07KoM7SAZ1cILfcejNb8W03kYI4aj5Tfgq+aZ6LcLUaGZ2 JFayxT1LnbPKDL8g0pFBh+mbv49y8e2DLhrzynBUy0rxV3KskX6U95aXc0Eu+eAA WQeBwwdfzGTFwUFnWtRqsb122fCUm+Jv4qkOq0QWbxlZKnkPvMeDzNnUzW1OM8JH 3wvDgUudzbA= =jtB0 -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce