RHSA-2021:2316: Red Hat Security Advisory: kernel-rt security and bug fix update

An update for kernel-rt is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.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 via PI futex state (CVE-2021-3347)
• kernel: use-after-free in n_tty_receive_buf_common function in drivers/tty/n_tty.c (CVE-2020-8648)
• kernel: Improper input validation in some Intel® Graphics Drivers (CVE-2020-12363)
• kernel: Null pointer dereference in some Intel® Graphics Drivers (CVE-2020-12364)
• kernel: Speculation on pointer arithmetic against bpf_context pointer (CVE-2020-27170) 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):
• lru-add-drain workqueue on RT is allocated without being used (BZ#1894587)
• kernel-rt: update to the latest RHEL7.9.z source tree (BZ#1953118) Related CVEs:
• CVE-2020-8648: kernel: use-after-free in n_tty_receive_buf_common function in drivers/tty/n_tty.c
• CVE-2020-12362: kernel: Integer overflow in Intel® Graphics Drivers
• CVE-2020-12363: kernel: Improper input validation in some Intel® Graphics Drivers
• CVE-2020-12364: kernel: Null pointer dereference in some Intel® Graphics Drivers
• CVE-2020-27170: kernel: Speculation on pointer arithmetic against bpf_context pointer
• CVE-2021-3347: kernel: Use after free via PI futex state