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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: kernel-rt security, bug fix, and enhancement update
Advisory ID:       RHSA-2015:1977-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1977.html
Issue date:        2015-09-25
Updated on:        2015-11-03
CVE Names:         CVE-2014-8559 CVE-2015-5156 
=====================================================================

1. Summary:

Updated kernel-rt packages that fix two security issues, several bugs, and
add one enhancement are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

2. Relevant releases/architectures:

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

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

* A flaw was found in the way the Linux kernel's VFS subsystem handled file
system locks. A local, unprivileged user could use this flaw to trigger a
deadlock in the kernel, causing a denial of service on the system.
(CVE-2014-8559, Moderate)

* A buffer overflow flaw was found in the way the Linux kernel's virtio-net
subsystem handled certain fraglists when the GRO (Generic Receive Offload)
functionality was enabled in a bridged network configuration. An attacker
on the local network could potentially use this flaw to crash the system,
or, although unlikely, elevate their privileges on the system.
(CVE-2015-5156, Moderate)

The CVE-2015-5156 issue was discovered by Jason Wang of Red Hat.

The kernel-rt packages have been upgraded to version 3.10.0-229.20.1, which
provides a number of bug fixes and enhancements over the previous version,
including:

* Unexpected completion is detected on Intel Ethernet x540

* Divide by zero error in intel_pstate_timer_func() [ inline s64
div_s64_rem() ]

* NFS Recover from stateid-type error on SETATTR

* pNFS RHEL 7.1 Data Server connection remains after umount due to lseg
refcount leak

* Race during NFS v4.0 recovery and standard IO.

* Fix ip6t_SYNPROXY for namespaces and connection delay

* synproxy window size and sequence number behaviour causes long connection
delay

* Crash in kmem_cache_alloc() during disk stress testing (using ipr)

* xfs: sync/backport to upstream v4.1

* iscsi_session recovery_tmo revert back to default when a path becomes
active

* read from MD raid1 can fail if read from resync target fails

* backport scsi-mq

* unable to handle kernel paging request at 0000000000237037 [zswap]

(BZ#1266915) 

All kernel-rt users are advised to upgrade to these updated packages, which
correct these issues and add this enhancement. The system must be rebooted
for this update to take effect.

4. 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

5. Bugs fixed (https://bugzilla.redhat.com/):

1159313 - CVE-2014-8559 kernel: fs: deadlock due to incorrect usage of rename_lock
1243852 - CVE-2015-5156 kernel: buffer overflow with fraglist larger than MAX_SKB_FRAGS + 2 in virtio-net
1266915 - kernel-rt: update to the RHEL7.1.z batch 6 source tree

6. Package List:

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-229.20.1.rt56.141.14.el7_1.src.rpm

noarch:
kernel-rt-doc-3.10.0-229.20.1.rt56.141.14.el7_1.noarch.rpm

x86_64:
kernel-rt-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm
kernel-rt-debug-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm
kernel-rt-debug-devel-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm
kernel-rt-debuginfo-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm
kernel-rt-devel-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm
kernel-rt-trace-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-229.20.1.rt56.141.14.el7_1.x86_64.rpm
kernel-rt-trace-devel-3.10.0-229.20.1.rt56.141.14.el7_1.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-2014-8559
https://access.redhat.com/security/cve/CVE-2015-5156
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.
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