RHSA-2021:2599: Red Hat Security Advisory: kernel-rt security and bug fix update

An update for kernel-rt is now available for Red Hat Enterprise Linux 8. 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: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
• kernel: security bypass in certs/blacklist.c and certs/system_keyring.c (CVE-2020-26541) 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):
• kernel-rt: update RT source tree to the RHEL-8.4.z1 source tree (BZ#1965378)
• panic caused by i40e_msix_clean_rings [rhel-rt] (BZ#1965970) Related CVEs:
• CVE-2020-26541: kernel: security bypass in certs/blacklist.c and certs/system_keyring.c
• CVE-2021-33034: kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan