RHSA-2019:3836 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.

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 packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• hw: Machine Check Error on Page Size Change (IFU) (CVE-2018-12207)
• hw: TSX Transaction Asynchronous Abort (TAA) (CVE-2019-11135)
• Kernel: vhost_net: infinite loop while receiving packets leads to DoS (CVE-2019-3900)
• hw: Intel GPU Denial Of Service while accessing MMIO in lower power state (CVE-2019-0154)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• [Intel 6.10 Bug] With mWait/C-states disabled, HT on, ibrs enabled, performance impact observed on user space benchmark (BZ#1560787)
• kernel-2.6.32-573.60.2.el6 hangs/resets during boot in efi_enter_virtual_mode() on Xeon v2 E7-2870 (BZ#1645724)
• Slab leak: skbuff_head_cache slab object still allocated after mcast processes are stopped and "fragments dropped after timeout" errors are shown (BZ#1752536)

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 Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 1646768 - CVE-2018-12207 hw: Machine Check Error on Page Size Change (IPU)
• BZ - 1698757 - CVE-2019-3900 Kernel: vhost_net: infinite loop while receiving packets leads to DoS
• BZ - 1724393 - CVE-2019-0154 hw: Intel GPU Denial Of Service while accessing MMIO in lower power state
• BZ - 1753062 - CVE-2019-11135 hw: TSX Transaction Asynchronous Abort (TAA)

CVEs

• CVE-2018-12207
• CVE-2019-0154
• CVE-2019-3900
• CVE-2019-11135

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/ifu-page-mce
• https://access.redhat.com/solutions/tsx-asynchronousabort
• https://access.redhat.com/solutions/i915-graphics