[Announce] Kernel RHEL6 042stab120.11

[Vasily Averin]

OpenVZ project released an updated RHEL6 based kernel.
Read below for more information. Everyone is advised to update.

Changes and Download
====================
(since 042stab120.6)

* Stack overflow via ecryptfs and /proc/$pid/environ. (CVE-2016-1583) 
It was found that stacking a file system over procfs in the Linux kernel could lead to a kernel stack overflow due to deep nesting, as demonstrated by mounting ecryptfs over procfs and creating a recursion by mapping /proc/environ. An unprivileged, local user could potentially use this flaw to escalate their privileges on the system.

* Use after free in tcp_xmit_retransmit_queue. (CVE-2016-6828) 
A use after free vulnerability was found in tcp_xmit_retransmit_queue and other tcp_* functions. This condition could allow an attacker to send an incorrect selective acknowledgment to existing connections, possibly resetting a connection.

* block: fix use-after-free in seq file. (CVE-2016-7910) 
Use-after-free vulnerability in the disk_seqf_stop function in block/genhd.c in the Linux kernel before 4.7.1 allows local users to gain privileges by leveraging the execution of a certain stop operation even if the corresponding start operation had failed.

* block: fix use-after-free in sys_ioprio_get(). (CVE-2016-7911) 

Race condition in the get_task_ioprio function in block/ioprio.c in the Linux kernel before 4.6.6 allows local users to gain privileges or cause a denial of service (use-after-free) via a crafted ioprio_get system call.

* Creation of a network bridge can break IPv6 setup on host. (PSBM-50920) Kernels from 042stab117.x are affected.
* Fixed host crash in ixgbe driver (10Gb NIC Intel) due to iptables TCP REJECT rule. (OVZ-6811) Kernels from 042stab117.x are affected
* CPT restore of containers with Unix sockets can crash the host. (OVZ-6823) All 042stab* kernels are affected.
* Removed WARN_ON in d_delete/unhash_offsprings generated false alert messages. (OVZ-6827) 042stab112+ kernels are affected
* Other internal improvements.

See also
========
https://www.redhat.com/security/data/cve/CVE-2016-1583.html
https://source.android.com/security/bulletin/2016-11-01.html
https://www.redhat.com/security/data/cve/CVE-2016-6828.html
https://infosec.cert-pa.it/cve-2016-7910.html
https://infosec.cert-pa.it/cve-2016-7911.html
https://access.redhat.com/solutions/2374831

For more info and downloads, see:
https://openvz.org/Download/kernel/rhel6/042stab120.11

Bug reporting
=============
Use http://bugs.openvz.org/ to report any bugs found.

Other sources of info on updates
================================
See http://planet.openvz.org/ to view all the news (including updates)
online. There you can also find RSS/Atom feed links.

Regards,
    OpenVZ team