Red Hat Enterprise Linux 8 RHSA-2021-1093-01 Important: Kernel Security Fix

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: SCSI target (LIO) write to any block on ILO backstore (CVE-2020-28374)
* kernel: Use after free via PI futex state (CVE-2021-3347)
* kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c (CVE-2021-26708)
* kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)
* kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)
* Kernel: KVM: host stack overflow due to lazy update IOAPIC (CVE-2020-27152)
* kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)
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):
* race condition when creating child sockets from syncookies (BZ#1915529)
* On System Z, a hash needs state randomized for entropy extraction (BZ#1915816)
* scsi: target: core_tmr_abort_task() reporting multiple aborts for the same se_cmd->tag (BZ#1918354)
* [mlx5] VF interface stats are not reflected in "ip -s link show" / "ifconfig " commands (BZ#1921060)
* Win10 guest automatic reboot after migration in Win10 and WSL2 on Intel hosts (BZ#1923281)
* [RHEL 8.3] Repeated messages - Unable to burst-read optrom segment (BZ#1924222)
* Backport bug fix RDMA/umem: Prevent small pages from being returned by ib_umem_find_best_pgsz (BZ#1924691)
* [Cisco 8.3] RHEL/Cent 8.2 fNIC driver needs a patch fix that addresses crash (BZ#1925186)
* RHEL8.3 - The kernel misdetects zCX with z/VM (BZ#1925508)
* Backport 22e4663e91 ("mm/slub: fix panic in slab_alloc_node()") (BZ#1925511)
* SCTP "Address already in use" when no active endpoints from RHEL 8.2 onwards (BZ#1927521)
* lpfc: Fix initial FLOGI failure due to BBSCN not supported (BZ#1927921)
* [mm] mm, oom: remove oom_lock from oom_reaper (BZ#1929738)
* Unexpected thread movement with AMD Milan compared to Rome (BZ#1929740)
* rpmbuild cannot build the userspace RPMs in the kernel package when the kernel itself is not built (BZ#1929910)
* [Regression] RHEL8.2 - ISST-LTE:pVM:diapvmlp83:sum:memory DLPAR fails to add memory on multiple trials[mm/memory_hotplug.c:1163] (mm-) (BZ#1930168)
* Configuring the system with non-RT kernel will hang the system (BZ#1930735)
* Upstream Patch for Gracefully handle DMAR units with no supported address widthsx86/vt-d (BZ#1932199)
* gfs2: Deadlock between gfs2_{create_inode,inode_lookup} and delete_work_func (BZ#1937109)
* Failing on tsx-ctrl when the flag doesn't change anything (BZ#1939013)
Enhancement(s):
* RFE: Backport all Audit enhancements and fixes up to version 5.10-rc1 (BZ#1907520)
* RHEL8.4: Update the target driver (BZ#1918363)
* [Mellanox 8.4 FEAT] mlx5: Hairpin Support in Switch Mode (BZ#1924689)