Issued:
2017-05-25
Updated:
2017-05-25

RHSA-2017:1298 - 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.

Security Fix(es):

  • It was found that the packet_set_ring() function of the Linux kernel's networking implementation did not properly validate certain block-size data. A local attacker with CAP_NET_RAW capability could use this flaw to trigger a buffer overflow, resulting in the crash of the system. Due to the nature of the flaw, privilege escalation cannot be fully ruled out. (CVE-2017-7308, Important)

  • Mounting a crafted EXT4 image read-only leads to an attacker controlled memory corruption and SLAB-Out-of-Bounds reads. (CVE-2016-10208, Moderate)

  • A flaw was found in the Linux kernel's implementation of seq_file where a local attacker could manipulate memory in the put() function pointer. This could lead to memory corruption and possible privileged escalation. (CVE-2016-7910, Moderate)

  • A vulnerability was found in the Linux kernel. An unprivileged local user could trigger oops in shash_async_export() by attempting to force the in-kernel hashing algorithms into decrypting an empty data set. (CVE-2016-8646, Moderate)

Red Hat would like to thank Igor Redko (Virtuozzo kernel team) for reporting CVE-2016-8646.

Bug Fix(es):

  • The kernel-rt packages have been upgraded to the 3.10.0-514.21.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1440803)

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-doc-3.10.0-514.21.1.rt56.438.el7.noarch.rpm
  • kernel-rt-trace-debuginfo-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-debug-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-trace-devel-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-debug-kvm-debuginfo-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-trace-kvm-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-kvm-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-debug-devel-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-trace-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-trace-kvm-debuginfo-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-debug-debuginfo-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-kvm-debuginfo-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-debug-kvm-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-debuginfo-common-x86_64-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-3.10.0-514.21.1.rt56.438.el7.src.rpm
  • kernel-rt-debuginfo-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm
  • kernel-rt-devel-3.10.0-514.21.1.rt56.438.el7.x86_64.rpm

Fixes

CVEs

References

Additional information