Red Hat Security Advisory 2016-2074-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: 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. This issue was discovered by David Howells.
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Red Hat Security Advisory
Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2016:2074-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-2074.html
Issue date: 2016-10-18
CVE Names: CVE-2016-4470
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1. Summary:
An update for kernel is now available for Red Hat Enterprise Linux 6.5
Advanced 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.
2. 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
3. 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 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)
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/):
1341716 - CVE-2016-4470 kernel: Uninitialized variable in request_key handling causes kernel crash in error handling path
6. 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
https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2016-4470
https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2016 Red Hat, Inc.
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