Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

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):

• The kernel-rt packages have been upgraded to the 3.10.0-693.37.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1599860)

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

• MRG Realtime 2 x86_64

Fixes

• BZ - 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass
• BZ - 1585005 - CVE-2018-3646 Kernel: hw: cpu: L1 terminal fault (L1TF)
• BZ - 1599860 - update the MRG 2.5.z 3.10 kernel-rt sources

CVEs

• CVE-2018-3620
• CVE-2018-3639
• CVE-2018-3646

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/L1TF

MRG Realtime 2

SRPM
kernel-rt-3.10.0-693.37.4.rt56.629.el6rt.src.rpm	SHA-256: d2692f1df6cb3e783d179295fe74c1524831f0578366076e76773aa0875742ff
x86_64
kernel-rt-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: 96cab3cf965c88bbfd9e29440a471b681d8c81e5b17c37e72bdb6f7e98a82bfa
kernel-rt-debug-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: 20f9b9fafb6ccbbc925cc4f4fafb872c76fb1758ac74e09bd819bfce083cb26e
kernel-rt-debug-debuginfo-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: bc4980def1c217b1c3ad6854ec44dbbd6fd31a8d4fc79bc1a8fda972de187bee
kernel-rt-debug-devel-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: 3c157403492a929d0eb02ab81c3c323e7928ea43b86bcdbb8d0c43ccec35fd08
kernel-rt-debuginfo-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: c0b74ce90d8a73b7a24bd91bbe3b7b45d3c56c88c541a5500dc41d29f7735b52
kernel-rt-debuginfo-common-x86_64-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: 8a41077bf436b998b250c90f706a4ead9a673d1e1ede06ea8be93952e80d3515
kernel-rt-devel-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: 743420b519f238dc785ceb1a2272ed87a0cd9c7a372100dd1f667ea3f389576a
kernel-rt-doc-3.10.0-693.37.4.rt56.629.el6rt.noarch.rpm	SHA-256: 181eeedbc7d47bde5696973e08c85ec7e0e3f58d2492d51778324c33bc328137
kernel-rt-firmware-3.10.0-693.37.4.rt56.629.el6rt.noarch.rpm	SHA-256: 065138ce1bed938c8189d3eab3771cd50ee65ea444775bfc2760a9fcbe21cb24
kernel-rt-trace-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: b7eb89e100d3cd170c0f19fc32b29a7d2c8d901bd3a6a870ef1a4db2680524ce
kernel-rt-trace-debuginfo-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: 45ab91f4f7fba94242b37f563503ed58bf023e3edc608cf57addcdb0ddc25a88
kernel-rt-trace-devel-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: 6471a1fcfc499db425e6b348083b6cc1fdd4339302b0b100a739627e1071168b
kernel-rt-vanilla-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: 81095478a5ce4663dca824a4a939668f4f458d56a1dc8b85bd8420e1f930c92a
kernel-rt-vanilla-debuginfo-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: 9b81ee1ccf3a7bb350e267c5e93991059ddd74b86a311f7e47ba87111441d7c3
kernel-rt-vanilla-devel-3.10.0-693.37.4.rt56.629.el6rt.x86_64.rpm	SHA-256: bf69814981f8405b769bca231eeddba598d842bf60c6fbbbe0d595c8225872ed