RHSA-2021:1739: Important: kernel-rt security and bug fix update

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.Security Fix(es): kernel: Integer overflow in Intel(R) Graphics Drivers (CVE-2020-12362) kernel: use-after-free caused by a malicious USB device in the drivers/usb/misc/adutux.c driver (CVE-2019-19523) kernel: use-after-free bug caused by a malicious USB device in the drivers/usb/misc/iowarrior.c driver (CVE-2019-19528) kernel: possible out of bounds write in kbdkeycode of keyboard.c (CVE-2020-0431) kernel: DoS by corrupting mountpoint reference counter (CVE-2020-12114) kernel: use-after-free in usbsgcancel function in drivers/usb/core/message.c (CVE-2020-12464) kernel: buffer uses out of index in ext3/4 filesystem (CVE-2020-14314) kernel: Use After Free vulnerability in cgroup BPF component (CVE-2020-14356) kernel: NULL pointer dereference in serial8250isainitports function in drivers/tty/serial/8250/8250core.c (CVE-2020-15437) kernel: umask not applied on filesystem without ACL support (CVE-2020-24394) kernel: TOCTOU mismatch in the NFS client code (CVE-2020-25212) kernel: incomplete permission checking for access to rbd devices (CVE-2020-25284) kernel: race condition between hugetlb sysctl handlers in mm/hugetlb.c (CVE-2020-25285) kernel: improper input validation in pppcpparsecr function leads to memory corruption and read overflow (CVE-2020-25643) kernel: perfeventparseaddrfilter memory (CVE-2020-25704) kernel: use-after-free in kernel midi subsystem (CVE-2020-27786) kernel: child process is able to access parent mm through hfi dev file handle (CVE-2020-27835) kernel: slab-out-of-bounds read in fbcon (CVE-2020-28974) kernel: fork: fix copyprocess(CLONEPARENT) race with the exiting ->realparent (CVE-2020-35508) kernel: use after free in tungetuser of tun.c could lead to local escalation of privilege (CVE-2021-0342) kernel: NULL pointer dereferences in ov511modeinitregs and ov518modeinitregs in drivers/media/usb/gspca/ov519.c (CVE-2020-11608) 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.Additional Changes:For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section.