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===================================================================== Red Hat Security Advisory
Synopsis: Moderate: kernel security and bug fix update Advisory ID: RHSA-2019:0202-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:0202 Issue date: 2019-01-29 CVE Names: CVE-2018-18397 =====================================================================
1. Summary:
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 Moderate. 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.
2. Relevant releases/architectures:
Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.5) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 7.5) - ppc64, ppc64le, x86_64
3. Description:
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: userfaultfd bypasses tmpfs file permissions (CVE-2018-18397)
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.
Bug Fix(es):
* When applying two instances of the kprobe debugging mechanism to the same function, one of the kprobes in some cases failed, depending on the kernel address space layout. Consequently, a kprobe registration error occurred. This update fixes the bug in the kprobes registration code to properly detect and handle ftrace-based kprobes. As a result, both kprobes now apply successfully in the described scenario. (BZ#1647815)
* Under heavy mad packet load, the SELinux checks in the mad packet queries for InfiniBand (IB) fabrics significantly increased the mad packet execution time. Consequently, if a single machine was executing a large perfquery to the IB switches of a High Performance (HPC) fabric, mad_rpc timeouts occurred, and the query failed even with SELinux disabled. This update eliminates the SELinux checks when SELinux is disabled. As a result, the mad packet queries through perfquery now have their original run times when SELinux is disabled. (BZ#1648810)
* Previously, a file-system shutdown process caused by an I/O error could race against a running fstrim process to acquire a xfs buffer lock. Consequently, the file-system shutdown process never completed due to a deadlock and the file-system became unresponsive, unable to be unmounted. This update fixes the lock ordering so that the deadlock no longer occurs and the file-system shutdown process now completes in the described scenario. (BZ#1657142)
4. 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.
5. Bugs fixed (https://bugzilla.redhat.com/):
1641548 - CVE-2018-18397 kernel: userfaultfd bypasses tmpfs file permissions
6. Package List:
Red Hat Enterprise Linux ComputeNode EUS (v. 7.5):
Source: kernel-3.10.0-862.27.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-862.27.1.el7.noarch.rpm
x86_64: kernel-devel-3.10.0-862.27.1.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5):
x86_64: kernel-debug-debuginfo-3.10.0-862.27.1.el7.x86_64.rpm
Red Hat Enterprise Linux Server EUS (v. 7.5):
Source: kernel-3.10.0-862.27.1.el7.src.rpm
noarch: kernel-doc-3.10.0-862.27.1.el7.noarch.rpm
ppc64: kernel-debuginfo-common-ppc64-3.10.0-862.27.1.el7.ppc64.rpm
ppc64le: python-perf-debuginfo-3.10.0-862.27.1.el7.ppc64le.rpm
s390x: python-perf-debuginfo-3.10.0-862.27.1.el7.s390x.rpm
x86_64: python-perf-debuginfo-3.10.0-862.27.1.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional EUS (v. 7.5):
ppc64: kernel-debug-debuginfo-3.10.0-862.27.1.el7.ppc64.rpm
ppc64le: kernel-debug-debuginfo-3.10.0-862.27.1.el7.ppc64le.rpm
x86_64: kernel-debug-debuginfo-3.10.0-862.27.1.el7.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2018-18397 https://access.redhat.com/security/updates/classification/#moderate
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/
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