RHSA-2021:3363 - Security Advisory

Topic

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.

Description

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)

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.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.2 x86_64
• Red Hat Enterprise Linux Server - AUS 8.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.2 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.2 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.2 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.2 aarch64
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 8.2 ppc64le
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 8.2 x86_64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 8.2 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 8.2 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 8.2 aarch64

Fixes

• BZ - 1965461 - CVE-2021-22543 kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks
• BZ - 1970807 - CVE-2021-32399 kernel: race condition for removal of the HCI controller
• BZ - 1971651 - CVE-2021-3609 kernel: race condition in net/can/bcm.c leads to local privilege escalation
• BZ - 1980101 - CVE-2021-22555 kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c

CVEs

• CVE-2021-3609
• CVE-2021-22543
• CVE-2021-22555
• CVE-2021-32399

References

• https://access.redhat.com/security/updates/classification/#important