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Red Hat 6.5 RHSA-2016-2074-01 Important: Kernel Security Fix

red hat
Calendar Grey October 18, 2016
Scroller Redhat
Crucial kernel patch released for Red Hat focusing on vulnerability resolutions and enhancement corrections. Comprehensive guidelines included for implementation.
An update for kernel is now available for Red Hat Enterprise Linux 6.5 Advanced 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):
* A flaw was found in the Linux kernel's keyring handling code, where in key_reject_and_link() an uninitialized variable would eventually lead to arbitrary free address which could allow attacker to use a use-after-free style attack. (CVE-2016-4470, Important)
This issue was discovered by David Howells (Red Hat Inc.).
Bug Fix(es):
* Previously, the BUG_ON() signal appeared in the fs_clear_inode() function where the nfs_have_writebacks() function reported a positive value for nfs_inode->npages. As a consequence, a kernel panic occurred. This update performs a serialization by holding the inode i_lock over the check of PagePrivate and locking the request, which fixes this bug. (BZ#1365161)

Topics%20covered

Topics Covered

security advisory security issue bug fix arbitrary code execution Red Hat Enterprise Linux important kernel

References

https://access.redhat.com/security/cve/CVE-2016-4470 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Server AUS (v. 6.5):
Source: kernel-2.6.32-431.74.1.el6.src.rpm
noarch: kernel-abi-whitelists-2.6.32-431.74.1.el6.noarch.rpm kernel-doc-2.6.32-431.74.1.el6.noarch.rpm kernel-firmware-2.6.32-431.74.1.el6.noarch.rpm
x86_64: kernel-2.6.32-431.74.1.el6.x86_64.rpm kernel-debug-2.6.32-431.74.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-431.74.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-431.74.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-431.74.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-431.74.1.el6.x86_64.rpm kernel-devel-2.6.32-431.74.1.el6.x86_64.rpm kernel-headers-2.6.32-431.74.1.el6.x86_64.rpm perf-2.6.32-431.74.1.el6.x86_64.rpm perf-debuginfo-2.6.32-431.74.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-431.74.1.el6.x86_64.rpm
Red Hat Enterprise Linux Server Optional AUS (v. 6.5):
Source: kernel-2.6.32-431.74.1.el6.src.rpm
x86_64: kernel-debug-debuginfo-2.6.32-431.74.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-431.74.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-431.74.1.el6.x86_64.rpm perf-debuginfo-2.6.32-431.74.1.el6.x86_64.rpm python-perf-2.6.32-431.74.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-431.74.1.el6.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

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:2074-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:2074.html
Issue date: 2016-10-18

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.5Advanced 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 security issue bug fix arbitrary code execution Red Hat Enterprise Linux important kernel

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 6.5) - noarch, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 6.5) - x86_64

Bugs Fixed

1341716 - CVE-2016-4470 kernel: Uninitialized variable in request_key handling causes kernel crash in error handling path

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