[RHSA-2021:4777] 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 drivers/infiniband/core/ucma.c ctx use-after-free (CVE-2020-36385)

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):

• scsi: ibmvfc: Avoid link down on FS9100 canister reboot (BZ#1882627)

• crash in qla2x00_status_entry() because of corrupt srb (BZ#1899599)

• qedf driver: race condition between qedf's completion work task and another work item tearing down an fcport with qedf_cleanup_fcport (BZ#1941766)

• The kernel crashes in hv_pci_remove_slots() upon hv device removal. A possible race between hv_pci_remove_slots() and pci_devices_present_work(). (BZ#1948961)

• I/O delays incorrectly handled in the NVMe stack (BZ#1981610)

• Data corruption in NFS client reusing slotid/seqid due to an interrupted slot (BZ#2007465)