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):

• Kernel: KVM: MMU potential stack buffer overrun during page walks (CVE-2017-12188, Important)
• Kernel: KVM: debug exception via syscall emulation (CVE-2017-7518, Moderate)

Bug Fix(es):

• The kernel-rt packages have been upgraded to the 3.10.0-693.21.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1537671)

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

• Red Hat Enterprise Linux for Real Time 7 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 7 x86_64

Fixes

• BZ - 1464473 - CVE-2017-7518 Kernel: KVM: debug exception via syscall emulation
• BZ - 1500380 - CVE-2017-12188 Kernel: KVM: MMU potential stack buffer overrun during page walks
• BZ - 1537671 - kernel-rt: update to the RHEL7.4.z batch#5 source tree

CVEs

• CVE-2017-7518
• CVE-2017-12188
• CVE-2017-18270

References