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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security, bug fix, and enhancement update
Advisory ID:       RHSA-2021:1093-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:1093
Issue date:        2021-04-06
CVE Names:         CVE-2020-0466 CVE-2020-27152 CVE-2020-28374 
                   CVE-2021-3347 CVE-2021-26708 CVE-2021-27363 
                   CVE-2021-27364 CVE-2021-27365 
=====================================================================

1. Summary:

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.

2. Relevant releases/architectures:

Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, x86_64
Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, noarch, ppc64le, s390x, x86_64

3. Description:

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)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1888886 - CVE-2020-27152 Kernel: KVM: host stack overflow due to lazy update IOAPIC
1899804 - CVE-2020-28374 kernel: SCSI target (LIO) write to any block on ILO backstore
1920480 - CVE-2020-0466 kernel: use after free in eventpoll.c may lead to escalation of privilege
1922249 - CVE-2021-3347 kernel: Use after free via PI futex state
1925588 - CVE-2021-26708 kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c
1930078 - CVE-2021-27365 kernel: heap buffer overflow in the iSCSI subsystem
1930079 - CVE-2021-27363 kernel: iscsi: unrestricted access to sessions and handles
1930080 - CVE-2021-27364 kernel: out-of-bounds read in libiscsi module

6. Package List:

Red Hat Enterprise Linux BaseOS (v. 8):

Source:
kernel-4.18.0-240.22.1.el8_3.src.rpm

aarch64:
bpftool-4.18.0-240.22.1.el8_3.aarch64.rpm
bpftool-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-core-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-cross-headers-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debug-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debug-core-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debug-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debug-devel-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debug-modules-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debug-modules-extra-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debuginfo-common-aarch64-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-devel-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-headers-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-modules-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-modules-extra-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-tools-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-tools-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-tools-libs-4.18.0-240.22.1.el8_3.aarch64.rpm
perf-4.18.0-240.22.1.el8_3.aarch64.rpm
perf-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm
python3-perf-4.18.0-240.22.1.el8_3.aarch64.rpm
python3-perf-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm

noarch:
kernel-abi-whitelists-4.18.0-240.22.1.el8_3.noarch.rpm
kernel-doc-4.18.0-240.22.1.el8_3.noarch.rpm

ppc64le:
bpftool-4.18.0-240.22.1.el8_3.ppc64le.rpm
bpftool-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-core-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-cross-headers-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debug-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debug-core-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debug-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debug-devel-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debug-modules-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debug-modules-extra-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-devel-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-headers-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-modules-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-modules-extra-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-tools-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-tools-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-tools-libs-4.18.0-240.22.1.el8_3.ppc64le.rpm
perf-4.18.0-240.22.1.el8_3.ppc64le.rpm
perf-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm
python3-perf-4.18.0-240.22.1.el8_3.ppc64le.rpm
python3-perf-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm

s390x:
bpftool-4.18.0-240.22.1.el8_3.s390x.rpm
bpftool-debuginfo-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-core-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-cross-headers-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-debug-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-debug-core-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-debug-debuginfo-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-debug-devel-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-debug-modules-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-debug-modules-extra-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-debuginfo-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-debuginfo-common-s390x-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-devel-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-headers-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-modules-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-modules-extra-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-tools-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-tools-debuginfo-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-zfcpdump-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-zfcpdump-core-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-zfcpdump-debuginfo-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-zfcpdump-devel-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-zfcpdump-modules-4.18.0-240.22.1.el8_3.s390x.rpm
kernel-zfcpdump-modules-extra-4.18.0-240.22.1.el8_3.s390x.rpm
perf-4.18.0-240.22.1.el8_3.s390x.rpm
perf-debuginfo-4.18.0-240.22.1.el8_3.s390x.rpm
python3-perf-4.18.0-240.22.1.el8_3.s390x.rpm
python3-perf-debuginfo-4.18.0-240.22.1.el8_3.s390x.rpm

x86_64:
bpftool-4.18.0-240.22.1.el8_3.x86_64.rpm
bpftool-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-core-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-cross-headers-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debug-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debug-core-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debug-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debug-devel-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debug-modules-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debug-modules-extra-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debuginfo-common-x86_64-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-devel-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-headers-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-modules-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-modules-extra-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-tools-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-tools-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-tools-libs-4.18.0-240.22.1.el8_3.x86_64.rpm
perf-4.18.0-240.22.1.el8_3.x86_64.rpm
perf-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm
python3-perf-4.18.0-240.22.1.el8_3.x86_64.rpm
python3-perf-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm

Red Hat CodeReady Linux Builder (v. 8):

aarch64:
bpftool-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debug-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-debuginfo-common-aarch64-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-tools-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm
kernel-tools-libs-devel-4.18.0-240.22.1.el8_3.aarch64.rpm
perf-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm
python3-perf-debuginfo-4.18.0-240.22.1.el8_3.aarch64.rpm

ppc64le:
bpftool-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debug-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-tools-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm
kernel-tools-libs-devel-4.18.0-240.22.1.el8_3.ppc64le.rpm
perf-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm
python3-perf-debuginfo-4.18.0-240.22.1.el8_3.ppc64le.rpm

x86_64:
bpftool-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debug-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-debuginfo-common-x86_64-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-tools-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm
kernel-tools-libs-devel-4.18.0-240.22.1.el8_3.x86_64.rpm
perf-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm
python3-perf-debuginfo-4.18.0-240.22.1.el8_3.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2020-0466
https://access.redhat.com/security/cve/CVE-2020-27152
https://access.redhat.com/security/cve/CVE-2020-28374
https://access.redhat.com/security/cve/CVE-2021-3347
https://access.redhat.com/security/cve/CVE-2021-26708
https://access.redhat.com/security/cve/CVE-2021-27363
https://access.redhat.com/security/cve/CVE-2021-27364
https://access.redhat.com/security/cve/CVE-2021-27365
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is . More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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