Issued:
2016-05-12
Updated:
2016-05-12

RHSA-2016:1051 - Important: kernel-rt security, bug fix, and enhancement update

Synopsis

Important: kernel-rt security, bug fix, and enhancement 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 contain the Linux kernel, the core of any Linux operating system.

The following packages have been upgraded to a newer upstream version: kernel-rt (3.10.0-327.18.2). This version provides a number of bug fixes and enhancements, including:

  • [scsi] bnx2fc: Fix FCP RSP residual parsing and remove explicit logouts

  • [scsi] mpt3sas: Fix for Asynchronous completion of timedout IO and task abort of timedout IO

  • [scsi] scsi_error: should not get sense for timeout IO in scsi error handler

  • [scsi] Revert libiscsi: Reduce locking contention in fast path

  • [mm] madvise: fix MADV_WILLNEED on shmem swapouts

  • [cpufreq] intel_pstate: decrease number of "HWP enabled" messages and enable HWP per CPU

  • [kernel] sched: Robustify topology setup

  • [kernel] sched/fair: Disable tg load_avg/runnable_avg update for root_task_group

  • [kernel] sched/fair: Move hot load_avg/runnable_avg into separate cacheline

  • [ib] mlx5: Fix RC transport send queue overhead computation

  • [fs] nfsd: fix clp->cl_revoked list deletion causing softlock in nfsd

  • [fs] ceph: multiple updates

(BZ#1322033)

Security Fix(es):

  • A flaw was found in the way the Linux kernel's ASN.1 DER decoder processed certain certificate files with tags of indefinite length. A local, unprivileged user could use a specially crafted X.509 certificate DER file to crash the system or, potentially, escalate their privileges on the system. (CVE-2016-0758, Important)

Red Hat would like to thank Philip Pettersson of Samsung for reporting this issue.

Bug Fix(es):

  • The hotplug lock and the console semaphore could be acquired in an incorrect order, which could previously lead to a deadlock causing the system console to freeze. The underlying code has been adjusted to acquire the locks in the correct order, resolving the bug with the console. (BZ#1324767)

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

ProductVersionArch
Red Hat Enterprise Linux for Real Time7x86_64
Red Hat Enterprise Linux for Real Time for x86_64 - Extended Life Cycle Support7x86_64
Red Hat Enterprise Linux for Real Time for NFV7x86_64

Updated Packages

  • kernel-rt-debuginfo-common-x86_64-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-kvm-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-trace-debuginfo-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-debug-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-devel-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-debug-debuginfo-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-debuginfo-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-trace-kvm-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-trace-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-3.10.0-327.18.2.rt56.223.el7_2.src.rpm
  • kernel-rt-doc-3.10.0-327.18.2.rt56.223.el7_2.noarch.rpm
  • kernel-rt-trace-kvm-debuginfo-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-trace-devel-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-debug-devel-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-debug-kvm-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-debug-kvm-debuginfo-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm
  • kernel-rt-kvm-debuginfo-3.10.0-327.18.2.rt56.223.el7_2.x86_64.rpm

Fixes

CVEs

References

Additional information