Issued:
2018-11-13
Updated:
2018-11-13

RHSA-2018:3586 - 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 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):

  • A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391)

  • kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c (CVE-2017-18344)

  • kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675)

  • 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 Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5391 and Qualys Research Labs for reporting CVE-2018-14634.

Bug Fix(es):

  • The kernel-rt packages have been upgraded to the 3.10.0-693.43.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1632422)

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
MRG Realtime2x86_64

Updated Packages

  • kernel-rt-firmware-3.10.0-693.43.1.rt56.630.el6rt.noarch.rpm
  • kernel-rt-vanilla-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-3.10.0-693.43.1.rt56.630.el6rt.src.rpm
  • kernel-rt-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-debug-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-debuginfo-common-x86_64-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-trace-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-vanilla-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-trace-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-debug-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-debug-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-vanilla-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
  • kernel-rt-doc-3.10.0-693.43.1.rt56.630.el6rt.noarch.rpm
  • kernel-rt-trace-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm

Fixes

CVEs

References

Additional information