(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® 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 kbd_keycode of keyboard.c (CVE-2020-0431)

• kernel: DoS by corrupting mountpoint reference counter (CVE-2020-12114)

• kernel: use-after-free in usb_sg_cancel 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 serial8250_isa_init_ports function in drivers/tty/serial/8250/8250_core.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 ppp_cp_parse_cr function leads to memory corruption and read overflow (CVE-2020-25643)

• kernel: perf_event_parse_addr_filter 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 copy_process(CLONE_PARENT) race with the exiting ->real_parent (CVE-2020-35508)

• kernel: use after free in tun_get_user of tun.c could lead to local escalation of privilege (CVE-2021-0342)

• kernel: NULL pointer dereferences in ov511_mode_init_regs and ov518_mode_init_regs 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.