Synopsis

Important: kernel security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.5 Extended Update Support.

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):

• kernel: Memory corruption due to incorrect socket cloning (CVE-2018-9568)
• kernel: MIDI driver race condition leads to a double-free (CVE-2018-10902)
• kernel: Use-after-free due to race condition in AF_PACKET implementation (CVE-2018-18559)
• Kernel: vhost_net: infinite loop while receiving packets leads to DoS (CVE-2019-3900)
• Kernel: page cache side channel attacks (CVE-2019-5489)
• Kernel: KVM: potential use-after-free via kvm_ioctl_create_device() (CVE-2019-6974)
• Kernel: KVM: nVMX: use-after-free of the hrtimer for emulation of the preemption timer (CVE-2019-7221)
• kernel: Inifinite loop vulnerability in mm/madvise.c:madvise_willneed() function allows local denial of service (CVE-2017-18208)

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):

• A cluster node has multiple hung "mv" processes that are accessing a gfs2 filesystem. (BZ#1716321)
• Growing unreclaimable slab memory (BZ#1741918)
• [LLNL 7.5 Bug] slab leak causing a crash when using kmem control group (BZ#1748236)
• kernel build: parallelize redhat/mod-sign.sh (BZ#1755328)
• kernel build: speed up module compression step (BZ#1755337)

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 x86_64 - Extended Update Support 7.5 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.5 s390x
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.5 ppc64
• Red Hat Enterprise Linux EUS Compute Node 7.5 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.5 ppc64le

Fixes

• BZ - 1551565 - CVE-2017-18208 kernel: Inifinite loop vulnerability in mm/madvise.c:madvise_willneed() function allows local denial of service
• BZ - 1590720 - CVE-2018-10902 kernel: MIDI driver race condition leads to a double-free
• BZ - 1641878 - CVE-2018-18559 kernel: Use-after-free due to race condition in AF_PACKET implementation
• BZ - 1655904 - CVE-2018-9568 kernel: Memory corruption due to incorrect socket cloning
• BZ - 1664110 - CVE-2019-5489 Kernel: page cache side channel attacks
• BZ - 1671904 - CVE-2019-7221 Kernel: KVM: nVMX: use-after-free of the hrtimer for emulation of the preemption timer
• BZ - 1671913 - CVE-2019-6974 Kernel: KVM: potential use-after-free via kvm_ioctl_create_device()
• BZ - 1698757 - CVE-2019-3900 Kernel: vhost_net: infinite loop while receiving packets leads to DoS

CVEs

• CVE-2017-18208
• CVE-2018-9568
• CVE-2018-10902
• CVE-2018-18559
• CVE-2019-3900
• CVE-2019-5489
• CVE-2019-6974
• CVE-2019-7221

References