(RHSA-2020:5206) Moderate: kernel security and bug fix 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 i2c_smbus_xfer_emulated in drivers/i2c/i2c-core-smbus.c (CVE-2017-18551)

• kernel: out of bounds write in i2c driver leads to local escalation of privilege (CVE-2019-9454)

• kernel: Denial Of Service in the __ipmi_bmc_register() function in drivers/char/ipmi/ipmi_msghandler.c (CVE-2019-19046)

• 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-2019-19447)

• kernel: sg_write function lacks an sg_remove_request 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.

Bug Fix(es):

• [RHEL7] deadlock between page fault handler and __get_free_pages() (BZ#1889766)

• RHEL7.6: no-carrier configured interfaces causes soft lockups by mount.nfs and hang booting/shutdown process (BZ#1889772)

• RHEL7.7 zstream - ESS - kernel panic triggered by freelist pointer corruption (BZ#1893807)