-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2018:2387-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:2387 Issue date: 2018-08-14 CVE Names: CVE-2018-3620 CVE-2018-3639 CVE-2018-3646 ==================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 7.4 Extended 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 ComputeNode EUS (v. 7.4) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.4) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 7.4) - ppc64, ppc64le, 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) Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646 and Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639. Bug Fix(es): * Previously, configurations with the little-endian variant of IBM Power Systems CPU architectures and Hard Disk Drives (HDD) designed according to Nonvolatile Memory Express (NVMe) open standards, experienced crashes during shutdown or reboot due to race conditions of CPUs. As a consequence, the sysfs pseudo file system threw a stack trace report about an attempt to create a duplicate entry in sysfs. This update modifies the source code so that the irq_dispose_mapping() function is called first and the msi_bitmap_free_hwirqs() function is called afterwards. As a result, the race condition no longer appears in the described scenario. (BZ#1570510) * When switching from the indirect branch speculation (IBRS) feature to the retpolines feature, the IBRS state of some CPUs was sometimes not handled correctly. Consequently, some CPUs were left with the IBRS Model-Specific Register (MSR) bit set to 1, which could lead to performance issues. With this update, the underlying source code has been fixed to clear the IBRS MSR bits correctly, thus fixing the bug. (BZ#1586147) * During a balloon reset, page pointers were not correctly initialized after unmapping the memory. Consequently, on the VMware ESXi hypervisor with "Fault Tolerance" and "ballooning" enabled, the following messages repeatedly occurred in the kernel log: [3014611.640148] WARNING: at mm/vmalloc.c:1491 __vunmap+0xd3/0x100() [3014611.640269] Trying to vfree() nonexistent vm area (ffffc90000697000) With this update, the underlying source code has been fixed to initialize page pointers properly. As a result, the mm/vmalloc.c warnings no longer occur under the described circumstances. (BZ#1595600) 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) 6. Package List: Red Hat Enterprise Linux ComputeNode EUS (v. 7.4): Source: kernel-3.10.0-693.37.4.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-693.37.4.el7.noarch.rpm kernel-doc-3.10.0-693.37.4.el7.noarch.rpm x86_64: kernel-3.10.0-693.37.4.el7.x86_64.rpm kernel-debug-3.10.0-693.37.4.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-debug-devel-3.10.0-693.37.4.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.37.4.el7.x86_64.rpm kernel-devel-3.10.0-693.37.4.el7.x86_64.rpm kernel-headers-3.10.0-693.37.4.el7.x86_64.rpm kernel-tools-3.10.0-693.37.4.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-tools-libs-3.10.0-693.37.4.el7.x86_64.rpm perf-3.10.0-693.37.4.el7.x86_64.rpm perf-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm python-perf-3.10.0-693.37.4.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4): x86_64: kernel-debug-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.37.4.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-693.37.4.el7.x86_64.rpm perf-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm Red Hat Enterprise Linux Server EUS (v. 7.4): Source: kernel-3.10.0-693.37.4.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-693.37.4.el7.noarch.rpm kernel-doc-3.10.0-693.37.4.el7.noarch.rpm ppc64: kernel-3.10.0-693.37.4.el7.ppc64.rpm kernel-bootwrapper-3.10.0-693.37.4.el7.ppc64.rpm kernel-debug-3.10.0-693.37.4.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-693.37.4.el7.ppc64.rpm kernel-debug-devel-3.10.0-693.37.4.el7.ppc64.rpm kernel-debuginfo-3.10.0-693.37.4.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-693.37.4.el7.ppc64.rpm kernel-devel-3.10.0-693.37.4.el7.ppc64.rpm kernel-headers-3.10.0-693.37.4.el7.ppc64.rpm kernel-tools-3.10.0-693.37.4.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-693.37.4.el7.ppc64.rpm kernel-tools-libs-3.10.0-693.37.4.el7.ppc64.rpm perf-3.10.0-693.37.4.el7.ppc64.rpm perf-debuginfo-3.10.0-693.37.4.el7.ppc64.rpm python-perf-3.10.0-693.37.4.el7.ppc64.rpm python-perf-debuginfo-3.10.0-693.37.4.el7.ppc64.rpm ppc64le: kernel-3.10.0-693.37.4.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-693.37.4.el7.ppc64le.rpm kernel-debug-3.10.0-693.37.4.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-693.37.4.el7.ppc64le.rpm kernel-debuginfo-3.10.0-693.37.4.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-693.37.4.el7.ppc64le.rpm kernel-devel-3.10.0-693.37.4.el7.ppc64le.rpm kernel-headers-3.10.0-693.37.4.el7.ppc64le.rpm kernel-tools-3.10.0-693.37.4.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-693.37.4.el7.ppc64le.rpm kernel-tools-libs-3.10.0-693.37.4.el7.ppc64le.rpm perf-3.10.0-693.37.4.el7.ppc64le.rpm perf-debuginfo-3.10.0-693.37.4.el7.ppc64le.rpm python-perf-3.10.0-693.37.4.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-693.37.4.el7.ppc64le.rpm s390x: kernel-3.10.0-693.37.4.el7.s390x.rpm kernel-debug-3.10.0-693.37.4.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-693.37.4.el7.s390x.rpm kernel-debug-devel-3.10.0-693.37.4.el7.s390x.rpm kernel-debuginfo-3.10.0-693.37.4.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-693.37.4.el7.s390x.rpm kernel-devel-3.10.0-693.37.4.el7.s390x.rpm kernel-headers-3.10.0-693.37.4.el7.s390x.rpm kernel-kdump-3.10.0-693.37.4.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-693.37.4.el7.s390x.rpm kernel-kdump-devel-3.10.0-693.37.4.el7.s390x.rpm perf-3.10.0-693.37.4.el7.s390x.rpm perf-debuginfo-3.10.0-693.37.4.el7.s390x.rpm python-perf-3.10.0-693.37.4.el7.s390x.rpm python-perf-debuginfo-3.10.0-693.37.4.el7.s390x.rpm x86_64: kernel-3.10.0-693.37.4.el7.x86_64.rpm kernel-debug-3.10.0-693.37.4.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-debug-devel-3.10.0-693.37.4.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.37.4.el7.x86_64.rpm kernel-devel-3.10.0-693.37.4.el7.x86_64.rpm kernel-headers-3.10.0-693.37.4.el7.x86_64.rpm kernel-tools-3.10.0-693.37.4.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-tools-libs-3.10.0-693.37.4.el7.x86_64.rpm perf-3.10.0-693.37.4.el7.x86_64.rpm perf-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm python-perf-3.10.0-693.37.4.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional EUS (v. 7.4): ppc64: kernel-debug-debuginfo-3.10.0-693.37.4.el7.ppc64.rpm kernel-debuginfo-3.10.0-693.37.4.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-693.37.4.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-693.37.4.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-693.37.4.el7.ppc64.rpm perf-debuginfo-3.10.0-693.37.4.el7.ppc64.rpm python-perf-debuginfo-3.10.0-693.37.4.el7.ppc64.rpm ppc64le: kernel-debug-debuginfo-3.10.0-693.37.4.el7.ppc64le.rpm kernel-debug-devel-3.10.0-693.37.4.el7.ppc64le.rpm kernel-debuginfo-3.10.0-693.37.4.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-693.37.4.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-693.37.4.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-693.37.4.el7.ppc64le.rpm perf-debuginfo-3.10.0-693.37.4.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-693.37.4.el7.ppc64le.rpm x86_64: kernel-debug-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.37.4.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-693.37.4.el7.x86_64.rpm perf-debuginfo-3.10.0-693.37.4.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.37.4.el7.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/updates/classification/#important https://access.redhat.com/security/vulnerabilities/L1TF 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 iQIVAwUBW3M4idzjgjWX9erEAQigJg//W8NS9ZAq71IYQ/6q5hTZBUeg3RsIJL4U OOCTlpLe3pH45ueU4Pm1HPopyyBHLGo988ZXPkH4z/jKW6txO3RDzf/blyWIwxwi dr76FUaMMLUk0ASeGcisZppOt/6zwrp2tfn+TyiC3pK0K5nTp+WVO5xYy5iecXVX 96M3wIhCIlshYPc1/F8zdYuBFzpYgBnotag//FjyCQlhmOFcKtTRgyQrSuf1ZxnL VNQ7UuVGjPWeF0w0OJrb6U7+pVrlwAvtwYkUjm/eFh/AszTe7uZ6C6mG8XAobDrl SpxhyqMTcplrKxvl0S01xuezVbVo8RdoAtrW9+xseozknta4cu7RHe0ZSsonY/xN RiAingIwsVde+g9KOv8jeleACBZu8mmJptkYbVb1IHPcp+1FzXXAkUc1i/oc7XBU lIfe49O3L2GyhI+0hUwhbPuc51L8yHmpr39KM1irKIRWsY692n32LVns3L6Kr0tW iWlhz4F2e5SNb2zlu3sMRQ4M0kf6JPX8VdRL1qMpfNoa9Ci4wYt+zP29//F6swji uwu3+SVH5VTW9VzymSCaQl/gD0loWPKVLFrTF5M9Y9+cl0uXn7CoW2LUNB86PhRz mMG+g2ZW9WbKcW/ERHofeii5WZGtsyA4FnUaWhzetfQIItEpmoobE9QVl0ar5GJ2 dsE8Ald7hA4=scjp -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce