RHSA-2020:5656: Moderate: kernel security update

The kernel packages contain the Linux kernel, the core of any Linux operating system.Security Fix(es): kernel: out of bounds write in function i2csmbusxferemulated in drivers/i2c/i2c-core-smbus.c (CVE-2017-18551) kernel: race condition in smptasktimedout() and smptaskdone() in drivers/scsi/libsas/sasexpander.c leads to use-after-free (CVE-2018-20836) kernel: out of bounds write in i2c driver leads to local escalation of privilege (CVE-2019-9454) kernel: Denial Of Service in the ipmibmcregister() function in drivers/char/ipmi/ipmimsghandler.c (CVE-2019-19046) kernel: mounting a crafted ext4 filesystem image, performing some operations, and unmounting can lead to a use-after-free in ext4putsuper in fs/ext4/super.c (CVE-2019-19447) kernel: out-of-bounds write via crafted keycode table (CVE-2019-20636) kernel: sgwrite function lacks an sgremoverequest call in a certain failure case (CVE-2020-12770) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.