Issued:
2016-09-14
Updated:
2016-09-14

RHSA-2016:1875 - Important: kernel-rt security and bug fix update

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.

The kernel-rt packages have been upgraded to the kernel-3.10.0-327.36.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1366538)

Security Fix(es):

  • A security flaw was found in the Linux kernel in the mark_source_chains() function in "net/ipv4/netfilter/ip_tables.c". It is possible for a user-supplied "ipt_entry" structure to have a large "next_offset" field. This field is not bounds checked prior to writing to a counter value at the supplied offset. (CVE-2016-3134, Important)

  • A flaw was discovered in processing setsockopt for 32 bit processes on 64 bit systems. This flaw will allow attackers to alter arbitrary kernel memory when unloading a kernel module. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges. (CVE-2016-4997, Important)

  • An out-of-bounds heap memory access leading to a Denial of Service, heap disclosure, or further impact was found in setsockopt(). The function call is normally restricted to root, however some processes with cap_sys_admin may also be able to trigger this flaw in privileged container environments. (CVE-2016-4998, Moderate)

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-3.10.0-327.36.1.rt56.237.el7.src.rpm
  • kernel-rt-debug-kvm-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-debug-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-debug-debuginfo-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-debug-devel-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-debug-kvm-debuginfo-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-devel-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-doc-3.10.0-327.36.1.rt56.237.el7.noarch.rpm
  • kernel-rt-trace-devel-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-trace-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-trace-debuginfo-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-kvm-debuginfo-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-kvm-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-debuginfo-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-debuginfo-common-x86_64-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-trace-kvm-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm
  • kernel-rt-trace-kvm-debuginfo-3.10.0-327.36.1.rt56.237.el7.x86_64.rpm

Fixes

CVEs

References

Additional information