Issued:

2019-02-12

Updated:

2019-02-12

RHSA-2019:0324 - Moderate: kernel security and bug fix update

Synopsis

Moderate: kernel security and bug fix update

Type/Severity

Security Advisory Moderate

Topic

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 Moderate. 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):

• kernel: userfaultfd bypasses tmpfs file permissions (CVE-2018-18397)

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.

Bug Fix(es):

• The timeout handling in the libfc.ko kernel module did not work correctly. This was happening during certain steps of the Fibre Channel login procedure, when the timeout handling was not synchronized with the state of a partially offloaded Fibre Channel over Ethernet (FCoE) in the lower-level driver. Consequently, the offloaded FCoE state was incorrect, which led to I/O timeout errors until the SCSI error recovery issued a host reset. This update fixes the bug by improving the libfc.ko error handling during the fabric login. As a result, the fabric login errors are addressed in time, without the I/O timeouts in the described scenario. (BZ#1655042)

• Symmetric Multi-Processing (SMP) or Non-Uniform Memory Access (NUMA) systems in some cases experienced deadlocks during a task migration and task wakeup operations. Consequently, the systems terminated unexpectedly with the following message:

  NMI watchdog: Watchdog detected hard LOCKUP on <some CPU #>

This update fixes the bug by queueing the stopper thread to run after locks are released. As a result, the deadlocks and the system crashes no longer occur in the described scenario. (BZ#1667326)

Users of kernel are advised to upgrade to these updated packages, which fix these bugs.

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

Updated Packages

• kernel-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-debug-devel-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-tools-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
• perf-debuginfo-3.10.0-693.44.1.el7.s390x.rpm
• kernel-debug-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-tools-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-tools-libs-devel-3.10.0-693.44.1.el7.ppc64.rpm
• perf-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
• kernel-debug-devel-3.10.0-693.44.1.el7.ppc64le.rpm
• python-perf-3.10.0-693.44.1.el7.x86_64.rpm
• python-perf-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
• kernel-tools-3.10.0-693.44.1.el7.ppc64le.rpm
• perf-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-headers-3.10.0-693.44.1.el7.x86_64.rpm
• python-perf-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-3.10.0-693.44.1.el7.s390x.rpm
• kernel-debug-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-devel-3.10.0-693.44.1.el7.x86_64.rpm
• kernel-kdump-devel-3.10.0-693.44.1.el7.s390x.rpm
• kernel-debuginfo-common-s390x-3.10.0-693.44.1.el7.s390x.rpm
• kernel-debug-devel-3.10.0-693.44.1.el7.x86_64.rpm
• perf-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-debug-devel-3.10.0-693.44.1.el7.s390x.rpm
• kernel-bootwrapper-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-doc-3.10.0-693.44.1.el7.noarch.rpm
• kernel-devel-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-kdump-3.10.0-693.44.1.el7.s390x.rpm
• kernel-3.10.0-693.44.1.el7.src.rpm
• kernel-debug-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
• kernel-debuginfo-3.10.0-693.44.1.el7.ppc64.rpm
• perf-3.10.0-693.44.1.el7.s390x.rpm
• kernel-tools-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-devel-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-headers-3.10.0-693.44.1.el7.s390x.rpm
• python-perf-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-debuginfo-common-ppc64le-3.10.0-693.44.1.el7.ppc64le.rpm
• python-perf-3.10.0-693.44.1.el7.s390x.rpm
• perf-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-debug-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
• kernel-tools-debuginfo-3.10.0-693.44.1.el7.x86_64.rpm
• kernel-debuginfo-common-x86_64-3.10.0-693.44.1.el7.x86_64.rpm
• kernel-debuginfo-3.10.0-693.44.1.el7.s390x.rpm
• kernel-tools-libs-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-tools-libs-devel-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-3.10.0-693.44.1.el7.x86_64.rpm
• python-perf-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-tools-libs-devel-3.10.0-693.44.1.el7.x86_64.rpm
• kernel-debug-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-bootwrapper-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-devel-3.10.0-693.44.1.el7.s390x.rpm
• kernel-tools-libs-3.10.0-693.44.1.el7.x86_64.rpm
• perf-3.10.0-693.44.1.el7.x86_64.rpm
• kernel-debug-debuginfo-3.10.0-693.44.1.el7.s390x.rpm
• python-perf-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-debug-3.10.0-693.44.1.el7.s390x.rpm
• kernel-kdump-debuginfo-3.10.0-693.44.1.el7.s390x.rpm
• perf-debuginfo-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-tools-3.10.0-693.44.1.el7.x86_64.rpm
• python-perf-debuginfo-3.10.0-693.44.1.el7.s390x.rpm
• kernel-debug-3.10.0-693.44.1.el7.x86_64.rpm
• kernel-abi-whitelists-3.10.0-693.44.1.el7.noarch.rpm
• kernel-headers-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-tools-libs-3.10.0-693.44.1.el7.ppc64.rpm
• kernel-headers-3.10.0-693.44.1.el7.ppc64le.rpm
• kernel-debuginfo-common-ppc64-3.10.0-693.44.1.el7.ppc64.rpm

Fixes

• This content is not included.BZ - 1641548

CVEs

• CVE-2018-18397

References

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

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.