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Security Fix(es):
- A security flaw was found in the Linux kernel in the mark_source_chains()
function in "net/ipv4/netfilter/ip_tables.c". It is possible for a user-supplied
"ipt_entry" structure to have a large "next_offset" field. This field is not
bounds checked prior to writing to a counter value at the supplied offset.
(CVE-2016-3134, Important)
- A flaw was discovered in processing setsockopt for 32 bit processes on 64 bit
systems. This flaw will allow attackers to alter arbitrary kernel memory when
unloading a kernel module. This action is usually restricted to root-privileged
users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS
and CONFIG_NET_NS and the user is granted elevated privileges. (CVE-2016-4997,
Important)
- An out-of-bounds heap memory access leading to a Denial of Service, heap
disclosure, or further impact was found in setsockopt(). The function call is
normally restricted to root, however some processes with cap_sys_admin may also
be able to trigger this flaw in privileged container environments.
(CVE-2016-4998, Moderate)
Bug Fix(es):
- In some cases, running the ipmitool command caused a kernel panic due to a
race condition in the ipmi message handler. This update fixes the race
condition, and the kernel panic no longer occurs in the described scenario.
(BZ#1353947)
- Previously, running I/O-intensive operations in some cases caused the system
to terminate unexpectedly after a null pointer dereference in the kernel. With
this update, a set of patches has been applied to the 3w-9xxx and 3w-sas drivers
that fix this bug. As a result, the system no longer crashes in the described
scenario. (BZ#1362040)
- Previously, the Stream Control Transmission Protocol (SCTP) sockets did not
inherit the SELinux labels properly. As a consequence, the sockets were labeled
with the unlabeled_t SELinux type which caused SCTP connections to fail. The
underlying source code has been modified, and SCTP connections now works as
expected. (BZ#1354302)
- Previously, the bnx2x driver waited for transmission completions when
recovering from a parity event, which substantially increased the recovery time.
With this update, bnx2x does not wait for transmission completion in the
described circumstances. As a result, the recovery of bnx2x after a parity event
now takes less time. (BZ#1351972)
Enhancement(s):
- With this update, the audit subsystem enables filtering of processes by name
besides filtering by PID. Users can now audit by executable name (with the "-F
exe=<path-to-executable>" option), which allows expression of many new audit
rules. This functionality can be used to create events when specific
applications perform a syscall. (BZ#1345774)
- With this update, the Nonvolatile Memory Express (NVMe) and the multi-queue
block layer (blk_mq) have been upgraded to the Linux 4.5 upstream version.
Previously, a race condition between timeout and freeing request in blk_mq
occurred, which could affect the blk_mq_tag_to_rq() function and consequently a
kernel oops could occur. The provided patch fixes this race condition by
updating the tags with the active request. The patch simplifies
blk_mq_tag_to_rq() and ensures that the two requests are not active at the same
time. (BZ#1350352)
- The Hyper-V storage driver (storvsc) has been upgraded from upstream. This
update provides moderate performance improvement of I/O operations when using
storvscr for certain workloads. (BZ#1360161)
Bugs fixed (https://bugzilla.redhat.com/):
1317383 - CVE-2016-3134 kernel: netfilter: missing bounds check in ipt_entry structure
1349722 - CVE-2016-4997 kernel: compat IPT_SO_SET_REPLACE setsockopt
1349886 - CVE-2016-4998 kernel: out of bounds reads when processing IPT_SO_SET_REPLACE setsockopt
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