Several patches are available to fix kernel errata.

Please refer to http://www.openbsd.org/errata59.html and errata58.html for details and patches.

Patches for 5.9 include:

013: RELIABILITY FIX: July 14, 2016 All architectures
Splicing sockets in a loop could cause a kernel spin.

014: RELIABILITY FIX: July 14, 2016 All architectures
Multiple processes exiting with a fd-passing control message on a shared
socket could crash the system.

015: RELIABILITY FIX: July 14, 2016 All architectures
ufs_readdir failed to limit size of memory allocation, leading to panics.

016: SECURITY FIX: July 14, 2016 All architectures
The mmap extension __MAP_NOFAULT could overcommit resources and crash the
system.

017: RELIABILITY FIX: July 14, 2016 All architectures
A race occuring in the unlocked ARP input path can lead to a kernel NULL
dereference.

018: RELIABILITY FIX: July 14, 2016 All architectures
Tick counting overflows could cause a kernel crash.

019: RELIABILITY FIX: July 14, 2016 All architectures
Invalid file descriptor use with kevent(2) could lead to a kernel crash.

020: RELIABILITY FIX: July 14, 2016 All architectures
Unchecked parameters and integer overflows in the amap allocation routines
could cause malloc(9) to either not allocate enough memory, leading to memory
corruption, or to trigger a "malloc: allocation too large" panic.

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