[RHSA-2016:1055-01] Important: kernel-rt security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Important: kernel-rt security and bug fix update

Advisory ID: RHSA-2016:1055-01

Product: Red Hat Enterprise MRG for RHEL-6

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1055.html

Issue date: 2016-05-12

CVE Names: CVE-2016-0758

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1. Summary:

 

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5.

 

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:

 

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

 

3. Description:

 

The kernel-rt packages contain the Linux kernel, the core of any Linux

operating system.

 

The following packages have been upgraded to a newer upstream version:

kernel-rt (3.10.0-327.18.2). This version provides a number of bug fixes

and enhancements, including:

 

* [scsi] bnx2fc: Fix FCP RSP residual parsing and remove explicit logouts

 

* [scsi] mpt3sas: Fix for Asynchronous completion of timedout IO and task

abort of timedout IO

 

* [scsi] scsi_error: should not get sense for timeout IO in scsi error

handler

 

* [scsi] Revert libiscsi: Reduce locking contention in fast path

 

* [mm] madvise: fix MADV_WILLNEED on shmem swapouts

 

* [cpufreq] intel_pstate: decrease number of "HWP enabled" messages and

enable HWP per CPU

 

* [kernel] sched: Robustify topology setup

 

* [kernel] sched/fair: Disable tg load_avg/runnable_avg update for

root_task_group

 

* [kernel] sched/fair: Move hot load_avg/runnable_avg into separate

cacheline

 

* [ib] mlx5: Fix RC transport send queue overhead computation

 

* [fs] nfsd: fix clp->cl_revoked list deletion causing softlock in nfsd

 

* [fs] ceph: multiple updates

 

(BZ#1320168)

 

Security Fix(es):

 

* A flaw was found in the way the Linux kernel's ASN.1 DER decoder

processed certain certificate files with tags of indefinite length. A

local, unprivileged user could use a specially crafted X.509 certificate

DER file to crash the system or, potentially, escalate their privileges on

the system. (CVE-2016-0758, Important)

 

Red Hat would like to thank Philip Pettersson of Samsung for reporting this

issue.

 

Bug Fix(es):

 

* The hotplug lock and the console semaphore could be acquired in an

incorrect order, which could previously lead to a deadlock causing the

system console to freeze. The underlying code has been adjusted to acquire

the locks in the correct order, resolving the bug with the console.

(BZ#1267425)

 

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/):

 

1300257 - CVE-2016-0758 kernel: tags with indefinite length can corrupt pointers in asn1_find_indefinite_length()

1320168 - update the MRG 2.5.x 3.10 kernel-rt sources

 

6. Package List:

 

MRG Realtime for RHEL 6 Server v.2:

 

Source:

kernel-rt-3.10.0-327.rt56.183.el6rt.src.rpm

 

noarch:

kernel-rt-doc-3.10.0-327.rt56.183.el6rt.noarch.rpm

kernel-rt-firmware-3.10.0-327.rt56.183.el6rt.noarch.rpm

 

x86_64:

kernel-rt-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-debug-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-debug-debuginfo-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-debug-devel-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-debuginfo-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-debuginfo-common-x86_64-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-devel-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-trace-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-trace-debuginfo-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-trace-devel-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-vanilla-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-vanilla-debuginfo-3.10.0-327.rt56.183.el6rt.x86_64.rpm

kernel-rt-vanilla-devel-3.10.0-327.rt56.183.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/

 

7. References:

 

https://access.redhat.com/security/cve/CVE-2016-0758

https://access.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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