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Security Fix(es):
- A race condition flaw was found in the N_HLDC Linux kernel driver when
accessing n_hdlc.tbuf list that can lead to double free. A local, unprivileged
user able to set the HDLC line discipline on the tty device could use this flaw
to increase their privileges on the system. (CVE-2017-2636, Important)
- A flaw was found in the Linux kernel's implementation of seq_file where a
local attacker could manipulate memory in the put() function pointer. This could
lead to memory corruption and possible privileged escalation. (CVE-2016-7910,
Moderate)
Bug Fix(es):
- Previously, Chelsio firmware included an incorrectly-formatted firmware bin
file. As a consequence, the firmware could not be flashed. This update provides
a firmware bin file that is formatted correctly. As a result, Chelsio firmware
can now be flashed successfully. (BZ#1433865)
- When multiple simultaneous processes attempted to read from the /proc/stat
file, spinlock overhead was generated on Non-Uniform Memory Access (NUMA)
systems. Consequently, a large amount of CPU was consumed. With this update, the
underlying source code has been fixed to avoid taking spinlock when the
interrupt line does not exist. As a result, the spinlock overhead is now
generated less often, and multiple simultaneous processes can now read
/proc/stat without consuming a large amount of CPU. (BZ#1428106)
Bugs fixed (https://bugzilla.redhat.com/):
1399727 - CVE-2016-7910 kernel: Use after free in seq file
1428319 - CVE-2017-2636 kernel: Race condition access to n_hdlc.tbuf causes double free in n_hdlc_release()
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