Red Hat Security Advisory: kernel security and bug fix update

CVE-2017-18551 — kernel: out of bounds write in function i2c_smbus_xfer_emulated in drivers/i2c/i2c-core-smbus.c CVE-2019-9454 — kernel: out of bounds write in i2c driver leads to local escalation of privilege CVE-2019-19447 — kernel: mounting a crafted ext4 filesystem image, performing some operations, and unmounting can lead to a use-after-free in ext4_put_super in fs/ext4/super.c CVE-2019-20636 — kernel: out-of-bounds write via crafted keycode table CVE-2020-12770 — kernel: sg_write function lacks an sg_remove_request call in a certain failure case