[RHSA-2021:1093] kernel security, bug fix, and enhancement 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: 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 <vf>" 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 trialsmm/memory_hotplug.c:1163 (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)