- Issued:
- 2018-05-22
- Updated:
- 2018-05-22
RHSA-2018:1636 - Important: kernel security update
Synopsis
Important: kernel security update
Type/Severity
Security Advisory Important
Topic
An update for kernel is now available for Red Hat Enterprise Linux 7.3 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.
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.
In this update mitigations for x86-64 architecture are provided.
Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.
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.
Affected Products
| Product | Version | Arch |
|---|---|---|
| Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions | 7.3 | x86_64 |
| Red Hat Enterprise Linux for x86_64 - Extended Update Support | 7.3 | x86_64 |
| Red Hat Enterprise Linux for Power, little endian - Extended Update Support | 7.3 | ppc64le |
| Red Hat Enterprise Linux for Power, big endian - Extended Update Support | 7.3 | ppc64 |
| Red Hat Enterprise Linux for IBM z Systems - Extended Update Support | 7.3 | s390x |
| Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions | 7.3 | ppc64le |
| Red Hat Enterprise Linux Server - TUS | 7.3 | x86_64 |
| Red Hat Enterprise Linux Server - AUS | 7.3 | x86_64 |
| Red Hat Enterprise Linux EUS Compute Node | 7.3 | x86_64 |
Updated Packages
- kernel-bootwrapper-3.10.0-514.48.5.el7.ppc64.rpm
- python-perf-3.10.0-514.48.5.el7.ppc64.rpm
- kernel-debuginfo-common-s390x-3.10.0-514.48.5.el7.s390x.rpm
- kernel-devel-3.10.0-514.48.5.el7.ppc64.rpm
- perf-debuginfo-3.10.0-514.48.5.el7.ppc64le.rpm
- python-perf-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-kdump-3.10.0-514.48.5.el7.s390x.rpm
- kernel-debug-debuginfo-3.10.0-514.48.5.el7.s390x.rpm
- kernel-kdump-debuginfo-3.10.0-514.48.5.el7.s390x.rpm
- kernel-headers-3.10.0-514.48.5.el7.x86_64.rpm
- python-perf-debuginfo-3.10.0-514.48.5.el7.ppc64.rpm
- kernel-debug-devel-3.10.0-514.48.5.el7.s390x.rpm
- kernel-3.10.0-514.48.5.el7.s390x.rpm
- kernel-bootwrapper-3.10.0-514.48.5.el7.ppc64le.rpm
- perf-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-debuginfo-3.10.0-514.48.5.el7.ppc64.rpm
- kernel-tools-libs-devel-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-abi-whitelists-3.10.0-514.48.5.el7.noarch.rpm
- kernel-debuginfo-3.10.0-514.48.5.el7.s390x.rpm
- kernel-devel-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-debug-3.10.0-514.48.5.el7.s390x.rpm
- kernel-debug-debuginfo-3.10.0-514.48.5.el7.ppc64.rpm
- kernel-3.10.0-514.48.5.el7.ppc64le.rpm
- python-perf-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-debuginfo-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-kdump-devel-3.10.0-514.48.5.el7.s390x.rpm
- kernel-headers-3.10.0-514.48.5.el7.s390x.rpm
- kernel-tools-debuginfo-3.10.0-514.48.5.el7.ppc64.rpm
- perf-debuginfo-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-tools-debuginfo-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-tools-3.10.0-514.48.5.el7.ppc64.rpm
- python-perf-debuginfo-3.10.0-514.48.5.el7.ppc64le.rpm
- perf-3.10.0-514.48.5.el7.ppc64.rpm
- python-perf-debuginfo-3.10.0-514.48.5.el7.s390x.rpm
- kernel-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-debug-debuginfo-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-debug-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-debug-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-debug-devel-3.10.0-514.48.5.el7.ppc64.rpm
- kernel-tools-3.10.0-514.48.5.el7.x86_64.rpm
- python-perf-debuginfo-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-tools-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-debug-devel-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-debuginfo-common-ppc64-3.10.0-514.48.5.el7.ppc64.rpm
- kernel-debuginfo-common-x86_64-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-headers-3.10.0-514.48.5.el7.ppc64.rpm
- kernel-tools-libs-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-debug-3.10.0-514.48.5.el7.ppc64.rpm
- kernel-tools-libs-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-debuginfo-common-ppc64le-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-3.10.0-514.48.5.el7.src.rpm
- kernel-tools-debuginfo-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-3.10.0-514.48.5.el7.ppc64.rpm
- perf-3.10.0-514.48.5.el7.s390x.rpm
- kernel-debug-devel-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-debuginfo-3.10.0-514.48.5.el7.x86_64.rpm
- kernel-tools-libs-3.10.0-514.48.5.el7.ppc64.rpm
- kernel-devel-3.10.0-514.48.5.el7.s390x.rpm
- kernel-headers-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-doc-3.10.0-514.48.5.el7.noarch.rpm
- perf-debuginfo-3.10.0-514.48.5.el7.s390x.rpm
- kernel-debug-debuginfo-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-tools-libs-devel-3.10.0-514.48.5.el7.ppc64le.rpm
- perf-3.10.0-514.48.5.el7.ppc64le.rpm
- kernel-devel-3.10.0-514.48.5.el7.ppc64le.rpm
- perf-debuginfo-3.10.0-514.48.5.el7.ppc64.rpm
- kernel-tools-libs-devel-3.10.0-514.48.5.el7.ppc64.rpm
- python-perf-3.10.0-514.48.5.el7.s390x.rpm
Fixes
CVEs
References
- https://access.redhat.com/security/updates/classification/#important
- This content is not included.This content is not included.https://access.redhat.com/security/vulnerabilities/ssbd
Additional information
- The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
- Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.