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Red Hat: RHSA-2017:1297-01 Important: kernel-rt Memory Corruption

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Calendar Grey May 25, 2017
Scroller Redhat
The recent kernel-rt update from Red Hat tackles significant vulnerabilities and enhances overall system integrity. Discover the implications of these changes.
An update for kernel-rt is now available for Red Hat Enterprise MRG 2

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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* It was found that the packet_set_ring() function of the Linux kernel's networking implementation did not properly validate certain block-size data. A local attacker with CAP_NET_RAW capability could use this flaw to trigger a buffer overflow, resulting in the crash of the system. Due to the nature of the flaw, privilege escalation cannot be fully ruled out. (CVE-2017-7308, Important)
* Mounting a crafted EXT4 image read-only leads to an attacker controlled memory corruption and SLAB-Out-of-Bounds reads. (CVE-2016-10208, Moderate)
* A flaw was found in the Linux kernel's implementation of seq_file where a local attacker could manipulate memory in the put() function pointer. This could lead to memory corruption and possible privileged escalation. (CVE-2016-7910, Moderate)
* A vulnerability was found in the Linux kernel. An unprivileged local user could trigger oops in shash_async_export() by attempting to force the in-kernel hashing algorithms into decrypting an empty data set. (CVE-2016-8646, Moderate)
Red Hat would like to thank Igor Redko (Virtuozzo kernel team) for reporting CVE-2016-8646.
Bug Fix(es):
* The kernel-rt packages have been upgraded to the 3.10.0-514 source tree, which provides a number of bug fixes over the previous version. (BZ#1440807)

References

https://access.redhat.com/security/cve/CVE-2016-10208 https://access.redhat.com/security/cve/CVE-2016-7910 https://access.redhat.com/security/cve/CVE-2016-8646 https://access.redhat.com/security/cve/CVE-2017-7308 https://access.redhat.com/security/updates/classification#important

Package List

MRG Realtime for RHEL 6 Server v.2:
Source: kernel-rt-3.10.0-514.rt56.221.el6rt.src.rpm
noarch: kernel-rt-doc-3.10.0-514.rt56.221.el6rt.noarch.rpm kernel-rt-firmware-3.10.0-514.rt56.221.el6rt.noarch.rpm
x86_64: kernel-rt-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-debug-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-debug-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-trace-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-trace-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-vanilla-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.10.0-514.rt56.221.el6rt.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-2017:1297-01
Product: Red Hat Enterprise MRG for RHEL-6
Issue date: 2017-05-25

Topic

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.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.

Relevant Releases Architectures

MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

Bugs Fixed

1388821 - CVE-2016-8646 kernel: Oops in shash_async_export()

1395190 - CVE-2016-10208 kernel: EXT4 memory corruption / SLAB out-of-bounds read

1399727 - CVE-2016-7910 kernel: Use after free in seq file

1437404 - CVE-2017-7308 kernel: net/packet: overflow in check for priv area size

1440807 - update the MRG 2.5.z 3.10 kernel-rt sources

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