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Security Fix(es):
- A use-after-free vulnerability was found in the kernel's socket recvmmsg
subsystem. This may allow remote attackers to corrupt memory and may allow
execution of arbitrary code. This corruption takes place during the error
handling routines within __sys_recvmmsg() function. (CVE-2016-7117, Important)
- 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. (CVE-2016-6828, Moderate)
- A flaw was found in the Linux kernel's implementation of the SCTP protocol. A
remote attacker could trigger an out-of-bounds read with an offset of up to 64kB
potentially causing the system to crash. (CVE-2016-9555, Moderate)
Bug Fix(es):
- Previously, the performance of Internet Protocol over InfiniBand (IPoIB) was
suboptimal due to a conflict of IPoIB with the Generic Receive Offload (GRO)
infrastructure. With this update, the data cached by the IPoIB driver has been
moved from a control block into the IPoIB hard header, thus avoiding the GRO
problem and the corruption of IPoIB address information. As a result, the
performance of IPoIB has been improved. (BZ#1390668)
- Previously, when a virtual machine (VM) with PCI-Passthrough interfaces was
recreated, a race condition between the eventfd daemon and the virqfd daemon
occurred. Consequently, the operating system rebooted. This update fixes the
race condition. As a result, the operating system no longer reboots in the
described situation. (BZ#1391611)
- Previously, a packet loss occurred when the team driver in round-robin mode
was sending a large number of packets. This update fixes counting of the packets
in the round-robin runner of the team driver, and the packet loss no longer
occurs in the described situation. (BZ#1392023)
- Previously, the virtual network devices contained in the deleted namespace
could be deleted in any order. If the loopback device was not deleted as the
last item, other netns devices, such as vxlan devices, could end up with
dangling references to the loopback device. Consequently, deleting a network
namespace (netns) occasionally ended by a kernel oops. With this update, the
underlying source code has been fixed to ensure the correct order when deleting
the virtual network devices on netns deletion. As a result, the kernel oops no
longer occurs under the described circumstances. (BZ#1392024)
- Previously, a Kabylake system with a Sunrise Point Platform Controller Hub
(PCH) with a PCI device ID of 0xA149 showed the following warning messages
during the boot:
"Unknown Intel PCH (0xa149) detected."
"Warning: Intel Kabylake processor with unknown PCH - this hardware has not
undergone testing by Red Hat and might not be certified. Please consult
https://hardware.redhat.com for certified hardware."
The messages were shown because this PCH was not properly recognized. With this
update, the problem has been fixed, and the operating system now boots without
displaying the warning messages. (BZ#1392033)
- Previously, the operating system occasionally became unresponsive after a long
run. This was caused by a race condition between the try_to_wake_up() function
and a woken up task in the core scheduler. With this update, the race condition
has been fixed, and the operating system no longer locks up in the described
scenario. (BZ#1393719)
Bugs fixed (https://bugzilla.redhat.com/):
1367091 - CVE-2016-6828 kernel: Use after free in tcp_xmit_retransmit_queue
1382268 - CVE-2016-7117 kernel: Use-after-free in the recvmmsg exit path
1397930 - CVE-2016-9555 kernel: Slab out-of-bounds access in sctp_sf_ootb()
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