In the Linux kernel, the following vulnerability has been resolved:

net/iucv: fix locking in .getsockopt

Mirror iucv_sock_setsockopt() and wrap the whole switch in
lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock
becomes redundant and is removed.

Any AF_IUCV HIPER user can potentially crash the kernel by racing
recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences
iucv->hs_dev->mtu after iucv_sock_close() (called from the racing
recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference
oops.

https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee

https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88

https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb

https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920

https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a

https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd

https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79

https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e

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