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RHEL 7.2 RHSA-2016:2695 Important: Kernel Bug Fix Causes DoS Risk

red hat
Calendar Grey November 9, 2016
Scroller Redhat
Stay informed about critical kernel vulnerabilities in Red Hat Enterprise Linux 7.2 and apply the necessary patches to improve system security now
An update for kernel is now available for Red Hat Enterprise Linux 7.2 Extended Update Support

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.

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* It was found that the Linux kernel's IPv6 implementation mishandled socket options. A local attacker could abuse concurrent access to the socket options to escalate their privileges, or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system call. (CVE-2016-3841, Important)
Additional Changes:
Space precludes documenting all of the bug fixes and enhancements included in this advisory. To see the complete list of bug fixes and enhancements, refer to the following KnowledgeBase article: https://access.redhat.com/articles/2754251

Topics%20covered

Topics Covered

security advisory denial of service kernel update bug fix important Red Hat Enterprise IPv6 issue

References

https://access.redhat.com/security/cve/CVE-2016-3841 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/articles/2754251

Package List

Red Hat Enterprise Linux ComputeNode EUS (v. 7.2):
Source: kernel-3.10.0-327.41.3.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.41.3.el7.noarch.rpm kernel-doc-3.10.0-327.41.3.el7.noarch.rpm
x86_64: kernel-3.10.0-327.41.3.el7.x86_64.rpm kernel-debug-3.10.0-327.41.3.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.41.3.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.41.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.41.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.41.3.el7.x86_64.rpm kernel-devel-3.10.0-327.41.3.el7.x86_64.rpm kernel-headers-3.10.0-327.41.3.el7.x86_64.rpm kernel-tools-3.10.0-327.41.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.41.3.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.41.3.el7.x86_64.rpm perf-3.10.0-327.41.3.el7.x86_64.rpm perf-debuginfo-3.10.0-327.41.3.el7.x86_64.rpm python-perf-3.10.0-327.41.3.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.41.3.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2):
x86_64: kernel-debug-debuginfo-3.10.0-327.41.3.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.41.3.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.41.3.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.41.3.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.41.3.el7.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:2695-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:2695.html
Issue date: 2016-11-09

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.2Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory denial of service kernel update bug fix important Red Hat Enterprise IPv6 issue

Relevant Releases Architectures

Red Hat Enterprise Linux ComputeNode EUS (v. 7.2) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2) - x86_64

Red Hat Enterprise Linux Server EUS (v. 7.2) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 7.2) - ppc64, ppc64le, x86_64

Bugs Fixed

1364971 - CVE-2016-3841 kernel: use-after-free via crafted IPV6 sendmsg for raw / tcp / udp / l2tp sockets.

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