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Red Hat 7: RHSA-2016:0065-01 Important: Kernel-RT Privilege Escalation

red hat
Calendar Grey January 25, 2016
Scroller Redhat
Crucial security enhancement for kernel-rt software to address privilege escalation vulnerability caused by use-after-free defect in Red Hat systems.
Updated kernel-rt 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-rt 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 update red hat privilege escalation important kernel-rt use-after-free

References

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

Package List

Red Hat Enterprise Linux Realtime (v. 7):
Source: kernel-rt-3.10.0-327.4.5.rt56.206.el7_2.src.rpm
noarch: kernel-rt-doc-3.10.0-327.4.5.rt56.206.el7_2.noarch.rpm
x86_64: kernel-rt-3.10.0-327.4.5.rt56.206.el7_2.x86_64.rpm kernel-rt-debug-3.10.0-327.4.5.rt56.206.el7_2.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-327.4.5.rt56.206.el7_2.x86_64.rpm kernel-rt-debug-devel-3.10.0-327.4.5.rt56.206.el7_2.x86_64.rpm kernel-rt-debuginfo-3.10.0-327.4.5.rt56.206.el7_2.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-327.4.5.rt56.206.el7_2.x86_64.rpm kernel-rt-devel-3.10.0-327.4.5.rt56.206.el7_2.x86_64.rpm kernel-rt-trace-3.10.0-327.4.5.rt56.206.el7_2.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-327.4.5.rt56.206.el7_2.x86_64.rpm kernel-rt-trace-devel-3.10.0-327.4.5.rt56.206.el7_2.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


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:0065-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:0065.html
Issue date: 2016-01-25

Topic

Updated kernel-rt packages that fix one security issue are now availablefor Red 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 update red hat privilege escalation important kernel-rt use-after-free

Relevant Releases Architectures

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

Bugs Fixed

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

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