Synopsis
Important: kernel security, bug fix, and enhancement update
Type/Severity
Security Advisory: Important
Topic
An update for kernel 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 packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
- Kernel: KVM: error in exception handling leads to wrong debug stack value (CVE-2018-1087)
- Kernel: error in exception handling leads to DoS (CVE-2018-8897)
- Kernel: ipsec: xfrm: use-after-free leading to potential privilege escalation (CVE-2017-16939)
- kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c (CVE-2018-1068)
- kernel: ptrace() incorrect error handling leads to corruption and DoS (CVE-2018-1000199)
- kernel: guest kernel crash during core dump on POWER9 host (CVE-2018-1091)
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 Andy Lutomirski for reporting CVE-2018-1087 and CVE-2018-1000199 and Nick Peterson (Everdox Tech LLC) and Andy Lutomirski for reporting CVE-2018-8897.
Bug Fix(es):
These updated kernel packages include also numerous bug fixes. Space precludes documenting all of these bug fixes in this advisory. See the bug fix descriptions in the related Knowledge Article: https://access.redhat.com/articles/3431641
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
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Red Hat Enterprise Linux Server 7 x86_64
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Red Hat Enterprise Linux Server - Extended Update Support 7.6 x86_64
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Red Hat Enterprise Linux Server - Extended Update Support 7.5 x86_64
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Red Hat Enterprise Linux Server - AUS 7.6 x86_64
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Red Hat Enterprise Linux Workstation 7 x86_64
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Red Hat Enterprise Linux Desktop 7 x86_64
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Red Hat Enterprise Linux for IBM z Systems 7 s390x
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Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
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Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.5 s390x
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Red Hat Enterprise Linux for Power, big endian 7 ppc64
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Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
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Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.5 ppc64
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Red Hat Enterprise Linux for Scientific Computing 7 x86_64
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Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
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Red Hat Enterprise Linux EUS Compute Node 7.5 x86_64
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Red Hat Enterprise Linux for Power, little endian 7 ppc64le
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Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.6 ppc64le
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Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.5 ppc64le
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Red Hat Virtualization Host 4 x86_64
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Red Hat Enterprise Linux Server - TUS 7.6 x86_64
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Red Hat Enterprise Linux for ARM 64 7 aarch64
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Red Hat Enterprise Linux for Power 9 7 ppc64le
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Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.6 ppc64le
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Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.6 x86_64
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Red Hat Enterprise Linux for IBM System z (Structure A) 7 s390x
Fixes
- BZ - 1517220 - CVE-2017-16939 Kernel: ipsec: xfrm: use-after-free leading to potential privilege escalation
- BZ - 1552048 - CVE-2018-1068 kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c
- BZ - 1558149 - CVE-2018-1091 kernel: guest kernel crash during core dump on POWER9 host
- BZ - 1566837 - CVE-2018-1087 Kernel: KVM: error in exception handling leads to wrong debug stack value
- BZ - 1567074 - CVE-2018-8897 Kernel: error in exception handling leads to DoS
- BZ - 1568477 - CVE-2018-1000199 kernel: ptrace() incorrect error handling leads to corruption and DoS
CVEs
References
Vulmon