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Red Hat Enterprise Linux 7: RHSA-2016:0064-01 Critical: Keyring Escalation

red hat
Calendar Grey January 25, 2016
Scroller Redhat
Crucial system patch released for CentOS addresses major vulnerability. Implement for improved protection.
Updated kernel packages that fix one security issue are now available for Red Hat Enterprise Linux 7

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.
* A use-after-free flaw was found in the way the Linux kernel's key management subsystem handled keyring object reference counting in certain error path of the join_session_keyring() function. A local, unprivileged user could use this flaw to escalate their privileges on the system. (CVE-2016-0728, Important)
Red Hat would like to thank the Perception Point research team for reporting this issue.
All kernel users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. The system must be rebooted for this update to take effect.

Topics%20covered

Topics Covered

security advisory red hat important kernel updates escalation keyring

References

https://access.redhat.com/security/cve/CVE-2016-0728 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: kernel-3.10.0-327.4.5.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-327.4.5.el7.noarch.rpm kernel-doc-3.10.0-327.4.5.el7.noarch.rpm
x86_64: kernel-3.10.0-327.4.5.el7.x86_64.rpm kernel-debug-3.10.0-327.4.5.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.4.5.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.4.5.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.4.5.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.4.5.el7.x86_64.rpm kernel-devel-3.10.0-327.4.5.el7.x86_64.rpm kernel-headers-3.10.0-327.4.5.el7.x86_64.rpm kernel-tools-3.10.0-327.4.5.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.4.5.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.4.5.el7.x86_64.rpm perf-3.10.0-327.4.5.el7.x86_64.rpm perf-debuginfo-3.10.0-327.4.5.el7.x86_64.rpm python-perf-3.10.0-327.4.5.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.4.5.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: kernel-debug-debuginfo-3.10.0-327.4.5.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.4.5.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.4.5.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.4.5.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.4.5.el7.x86_64.rpm perf-debuginfo-3.10.0-327.4.5.el7.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:0064-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:0064.html
Issue date: 2016-01-25

Topic

Updated kernel packages that fix one security issue are now available forRed Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having Important securityimpact. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available from the CVE link in theReferences section.

Topics%20covered

Topics Covered

security advisory red hat important kernel updates escalation keyring

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

Bugs Fixed

1297475 - CVE-2016-0728 kernel: Possible use-after-free vulnerability in keyring facility

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