RHSA-2021:3363: Red Hat Security Advisory: kernel security, bug fix, and enhancement update

An update for kernel is now available for Red Hat Enterprise Linux 8.2 Extended Update Support. 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: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609)
• kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)
• kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)
• kernel: race condition for removal of the HCI controller (CVE-2021-32399) 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):
• [Regression] RHEL8.2 - ISST-LTE:pVM:diapvmlp83:sum:memory DLPAR fails to add memory on multiple trials[mm/memory_hotplug.c:1163] (mm-) (BZ#1930169)
• Every server is displaying the same power levels for all of our i40e 25G interfaces. 10G interfaces seem to be correct. Ethtool version is 5.0 (BZ#1967100)
• s390/uv: Fix handling of length extensions (BZ#1975657)
• RHEL 8.3 using FCOE via a FastLinQ QL45000 card will not manually scan in LUN from Target_id’s over 8 (BZ#1976265)
• Backport “tick/nohz: Conditionally restart tick on idle exit” to RHEL 8.5 (BZ#1978711)
• rhel8.3: phase 2 netfilter backports from upstream (BZ#1980323)
• xfrm: backports from upstream (BZ#1981841) Enhancement(s):
• [8.2.z] Incorrect parsing of ACPI HMAT table reports incorrect kernel WARNING taint (BZ#1943702)
• Only selected patches from [IBM 8.4 FEAT] ibmvnic: Backport FW950 and assorted bug fixes (BZ#1980795) Related CVEs:
• CVE-2021-3609: kernel: race condition in net/can/bcm.c leads to local privilege escalation
• CVE-2021-22543: kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks
• CVE-2021-22555: kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c
• CVE-2021-32399: kernel: race condition for removal of the HCI controller