The unimac_mdio_probe function in drivers/net/phy/mdio-bcm-unimac.c in the Linux kernel through 4.15.8 does not validate certain resource availability, which allows local users to cause a denial of service (NULL pointer dereference).Referenceshttps://usn.ubuntu.com/3619-2/https://usn.ubuntu.com/3630-2/https://usn.ubuntu.com/3632-1/http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=297a6961ffb8ff4dc66c9fbf53b924bd1dda05d5https://github.com/torvalds/linux/commit/297a6961ffb8ff4dc66c9fbf53b924bd1dda05d5https://usn.ubuntu.com/3630-1/https://usn.ubuntu.com/3619-1/http://www.securitytracker.com/id/1040749
