(RHSA-2022:0620) Important: kernel security and bug fix update

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466)

• kernel: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920)

• kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL (CVE-2021-4155)

• kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330)

• kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942)

• kernel: out of bounds write in hid-multitouch.c may lead to escalation of privilege (CVE-2020-0465)

• kernel: double free in bluetooth subsystem when the HCI device initialization fails (CVE-2021-3564)

• kernel: use-after-free in function hci_sock_bound_ioctl() (CVE-2021-3573)

• kernel: possible use-after-free in bluetooth module (CVE-2021-3752)

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 with enabled BERT does not decode CPU fatal events correctly (BZ#1950302)

• RHEL 7.9 - Call trace seen during controller random reset on IB config (BZ#1984070)

• Infinite loop in blk_set_queue_dying() from blk_queue_for_each_rl() when another CPU races and modifies the queue’s blkg_list (BZ#2029574)

• NFS client kernel crash in NFS4 backchannel transmit path - ftrace_raw_event_rpc_task_queued called from rpc_run_bc_task (BZ#2039508)

• SELinux is preventing / from mount access on the filesystem /proc (BZ#2040196)