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 Linux 7.

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):

• kernel: Integer overflow in Linux's create_elf_tables function (CVE-2018-14634)
  

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank Qualys Research Labs for reporting this issue.

Bug Fix(es):

• The kernel-rt packages have been upgraded to the 3.10.0-862.14.3 source tree, which provides a number of bug fixes over the previous version. (BZ#1616429)
  
• Previously, preemption was enabled too early after a context switch. If a task was migrated to another CPU after a context switch, a mismatch between CPU and runqueue during load balancing sometimes occurred. Consequently, a runnable task on an idle CPU failed to run, and the operating system became unresponsive. This update disables preemption in the schedule_tail() function. As a result, CPU migration during post-schedule processing no longer occurs, which prevents the above mismatch. The operating system no longer hangs due to this bug. (BZ#1617941)

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

• Red Hat Enterprise Linux for Real Time 7 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 7 x86_64

Fixes

• BZ - 1616429 - kernel-rt: update to the RHEL7.5.z batch#4 source tree
• BZ - 1617941 - RT system hang due to wrong of rq's nr_running [rhel-7.5.z]
• BZ - 1624498 - CVE-2018-14634 kernel: Integer overflow in Linux's create_elf_tables function

CVEs

• CVE-2018-14634

References

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

Red Hat Enterprise Linux for Real Time 7

SRPM
kernel-rt-3.10.0-862.14.4.rt56.821.el7.src.rpm	SHA-256: 6202eaf4c8276986fc6275cb805761ec26eebeceecba6aa6b492b01742ff99b6
x86_64
kernel-rt-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: f02887c4c745277a143d5f19fcf6d4e49adac73a49df2eb4e57fd81533cafbb9
kernel-rt-debug-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 03be9e90fb948e4c905e72db460f8aba92b64ef1ecf969827b08f1adb5b2749d
kernel-rt-debug-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 983cf08d363716d0946328033c27ac8e75617b906d0ffc3f97905b766ec99d3d
kernel-rt-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 6827ff6659f4f8b743620a0d7b9deb401673488f9a795a91a1c5aef9adb9bc74
kernel-rt-doc-3.10.0-862.14.4.rt56.821.el7.noarch.rpm	SHA-256: 5af78f85061f510a2b967f9facf3ec57b35f74d110d238fc64450da815d9fadb
kernel-rt-trace-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: b2130b0f3b6148f488b535155e96abebc91803b958c224b0ce8e26dcdd806a30
kernel-rt-trace-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: ec5691d92b97dedf14341d006ee394bd267e39818054a7b9194d38bd0641e24e

Red Hat Enterprise Linux for Real Time for NFV 7

SRPM
kernel-rt-3.10.0-862.14.4.rt56.821.el7.src.rpm	SHA-256: 6202eaf4c8276986fc6275cb805761ec26eebeceecba6aa6b492b01742ff99b6
x86_64
kernel-rt-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: f02887c4c745277a143d5f19fcf6d4e49adac73a49df2eb4e57fd81533cafbb9
kernel-rt-debug-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 03be9e90fb948e4c905e72db460f8aba92b64ef1ecf969827b08f1adb5b2749d
kernel-rt-debug-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 19bfb63ba16ed80e2eee9a19496a0305ef310372f1a5a46d8ac3b38509b6f2be
kernel-rt-debug-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 983cf08d363716d0946328033c27ac8e75617b906d0ffc3f97905b766ec99d3d
kernel-rt-debug-kvm-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 71dc3f16a30d52534ff9218748cdfa656e6648e72809e32bd498021332bc7b26
kernel-rt-debug-kvm-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: f495b298408ea45264a34629795fb5d278fa3b5a1b278b11c648a535b0024c09
kernel-rt-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: d8761bf2aab6391d4fc1e6964cf645fcfdd8ab3a2e5c227f8588ef829d7ebfa9
kernel-rt-debuginfo-common-x86_64-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: a25aa077b84c1fe697685a7848657e3fab95c1e0a28d78a1c73862f6f8800d6a
kernel-rt-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 6827ff6659f4f8b743620a0d7b9deb401673488f9a795a91a1c5aef9adb9bc74
kernel-rt-doc-3.10.0-862.14.4.rt56.821.el7.noarch.rpm	SHA-256: 5af78f85061f510a2b967f9facf3ec57b35f74d110d238fc64450da815d9fadb
kernel-rt-kvm-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: ded80ed91a4c31cdb31a6b21700a6ae1d6d7c3f6568a6635ed04b7255cea37cc
kernel-rt-kvm-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 0378fe4db7f1b99db836df6f9307fbedb0737c032a4e2a711275a7aeb7646e2a
kernel-rt-trace-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: b2130b0f3b6148f488b535155e96abebc91803b958c224b0ce8e26dcdd806a30
kernel-rt-trace-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 6bada1919b64d0549e416d9102849841320d967f60ba992cdde9d1949f39bc8c
kernel-rt-trace-devel-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: ec5691d92b97dedf14341d006ee394bd267e39818054a7b9194d38bd0641e24e
kernel-rt-trace-kvm-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 184b2eff4c0dba83dcfd0f194edd5e90a5bb93e789ed8e0b3bf84f730bf67aef
kernel-rt-trace-kvm-debuginfo-3.10.0-862.14.4.rt56.821.el7.x86_64.rpm	SHA-256: 2e428e438c9f40f1c31fab61d46238c55df0c28e684b9213198e9be1ae1ec742