- Issued:
- 2016-08-23
- Updated:
- 2016-08-23
RHSA-2016:1657 - Important: kernel security update
Synopsis
Important: kernel security update
Type/Severity
Security Advisory Important
Topic
An update for kernel is now available for Red Hat Enterprise Linux 7.1 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):
-
A flaw was found in the Linux kernel's keyring handling code, where in key_reject_and_link() an uninitialised variable would eventually lead to arbitrary free address which could allow attacker to use a use-after-free style attack. (CVE-2016-4470, Important)
-
A flaw was found in the way certain interfaces of the Linux kernel's Infiniband subsystem used write() as bi-directional ioctl() replacement, which could lead to insufficient memory security checks when being invoked using the splice() system call. A local unprivileged user on a system with either Infiniband hardware present or RDMA Userspace Connection Manager Access module explicitly loaded, could use this flaw to escalate their privileges on the system. (CVE-2016-4565, Important)
-
A flaw was found in the implementation of the Linux kernel's handling of networking challenge ack where an attacker is able to determine the shared counter which could be used to determine sequence numbers for TCP stream injection. (CVE-2016-5696, Important)
Red Hat would like to thank Jann Horn for reporting CVE-2016-4565 and Yue Cao (Cyber Security Group of the CS department of University of California in Riverside) for reporting CVE-2016-5696. The CVE-2016-4470 issue was discovered by David Howells (Red Hat Inc.).
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
| Product | Version | Arch |
|---|---|---|
| Red Hat Enterprise Linux for x86_64 - Extended Update Support | 7.1 | x86_64 |
| Red Hat Enterprise Linux for Power, little endian - Extended Update Support | 7.1 | ppc64le |
| Red Hat Enterprise Linux for Power, big endian - Extended Update Support | 7.1 | ppc64 |
| Red Hat Enterprise Linux for IBM z Systems - Extended Update Support | 7.1 | s390x |
| Red Hat Enterprise Linux EUS Compute Node | 7.1 | x86_64 |
Updated Packages
- perf-debuginfo-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-debuginfo-common-s390x-3.10.0-229.40.1.el7.s390x.rpm
- perf-debuginfo-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-tools-debuginfo-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-debug-debuginfo-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-tools-libs-3.10.0-229.40.1.ael7b.ppc64le.rpm
- python-perf-3.10.0-229.40.1.el7.s390x.rpm
- kernel-tools-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-devel-3.10.0-229.40.1.el7.s390x.rpm
- python-perf-debuginfo-3.10.0-229.40.1.el7.ppc64.rpm
- python-perf-3.10.0-229.40.1.el7.x86_64.rpm
- perf-debuginfo-3.10.0-229.40.1.el7.s390x.rpm
- kernel-devel-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-tools-3.10.0-229.40.1.ael7b.ppc64le.rpm
- perf-debuginfo-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-bootwrapper-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-debug-debuginfo-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-doc-3.10.0-229.40.1.ael7b.noarch.rpm
- kernel-debuginfo-common-ppc64-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-headers-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-3.10.0-229.40.1.el7.src.rpm
- kernel-debug-debuginfo-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-tools-debuginfo-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-headers-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-debuginfo-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-debuginfo-common-ppc64le-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-debug-devel-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-bootwrapper-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-kdump-debuginfo-3.10.0-229.40.1.el7.s390x.rpm
- perf-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-debug-devel-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-3.10.0-229.40.1.el7.s390x.rpm
- kernel-tools-libs-devel-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-devel-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-debug-3.10.0-229.40.1.el7.s390x.rpm
- perf-3.10.0-229.40.1.el7.s390x.rpm
- kernel-debuginfo-3.10.0-229.40.1.el7.s390x.rpm
- kernel-debug-devel-3.10.0-229.40.1.el7.s390x.rpm
- kernel-tools-libs-devel-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-kdump-3.10.0-229.40.1.el7.s390x.rpm
- kernel-tools-libs-devel-3.10.0-229.40.1.el7.ppc64.rpm
- python-perf-debuginfo-3.10.0-229.40.1.el7.s390x.rpm
- kernel-debug-3.10.0-229.40.1.ael7b.ppc64le.rpm
- python-perf-debuginfo-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-3.10.0-229.40.1.ael7b.src.rpm
- kernel-debuginfo-common-x86_64-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-headers-3.10.0-229.40.1.el7.s390x.rpm
- kernel-debuginfo-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-devel-3.10.0-229.40.1.ael7b.ppc64le.rpm
- perf-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-headers-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-debug-3.10.0-229.40.1.el7.ppc64.rpm
- python-perf-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-doc-3.10.0-229.40.1.el7.noarch.rpm
- kernel-abi-whitelists-3.10.0-229.40.1.ael7b.noarch.rpm
- kernel-debug-devel-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-tools-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-debug-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-tools-libs-3.10.0-229.40.1.el7.ppc64.rpm
- python-perf-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-debug-debuginfo-3.10.0-229.40.1.el7.s390x.rpm
- kernel-tools-libs-3.10.0-229.40.1.el7.x86_64.rpm
- python-perf-debuginfo-3.10.0-229.40.1.ael7b.ppc64le.rpm
- kernel-debuginfo-3.10.0-229.40.1.el7.ppc64.rpm
- kernel-abi-whitelists-3.10.0-229.40.1.el7.noarch.rpm
- kernel-tools-debuginfo-3.10.0-229.40.1.el7.x86_64.rpm
- perf-3.10.0-229.40.1.el7.x86_64.rpm
- kernel-kdump-devel-3.10.0-229.40.1.el7.s390x.rpm
Fixes
- This content is not included.BZ - 1310570
- This content is not included.BZ - 1341716
- This content is not included.BZ - 1354708
CVEs
References
Additional information
- The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
- Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.