RHSA-2021:1093: Red Hat Security Advisory: kernel security, bug fix, and enhancement update

An update for kernel 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 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 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) Related CVEs:
• CVE-2020-0466: kernel: use after free in eventpoll.c may lead to escalation of privilege
• CVE-2020-27152: Kernel: KVM: host stack overflow due to lazy update IOAPIC
• CVE-2020-28374: kernel: SCSI target (LIO) write to any block on ILO backstore
• CVE-2021-3347: kernel: Use after free via PI futex state
• CVE-2021-26708: kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c
• CVE-2021-27363: kernel: iscsi: unrestricted access to sessions and handles
• CVE-2021-27364: kernel: out-of-bounds read in libiscsi module
• CVE-2021-27365: kernel: heap buffer overflow in the iSCSI subsystem