Important: kernel security, bug fix, and enhancement update

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.4 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.

The following packages have been upgraded to a later upstream version: kernel (4.18.0).

Security Fix(es):

• A use-after-free in cls_route filter implementation may lead to privilege escalation (CVE-2022-2588)
• Information leak in the IPv6 implementation (CVE-2021-45485)
• Information leak in the IPv4 implementation (CVE-2021-45486)
• Incomplete cleanup of multi-core shared buffers (aka SBDR) (CVE-2022-21123)
• Incomplete cleanup of microarchitectural fill buffers (aka SBDS) (CVE-2022-21125)
• Incomplete cleanup in specific special register write operations (aka DRPW) (CVE-2022-21166)

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):

• DR, Ignore modify TTL if ConnectX-5 doesn't support it (BZ#2075549)
• execve exit tracepoint not called (BZ#2106663)
• Unable to boot RHEL-8.6 on Brazos max. config (Install is success) (BZ#2107475)
• "vmcore failed, _exitcode:139" error observed while capturing vmcore during fadump after memory remove. incomplete vmcore is captured. (BZ#2107490)
• soft lockups under heavy I/O load to ahci connected SSDs (BZ#2110773)
• Allow substituting custom vmlinux.h for the build (BZ#2116407)

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 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.4 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.4 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.4 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.4 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.4 x86_64
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 8.4 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 8.4 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 8.4 aarch64

Fixes

• BZ - 2039911 - CVE-2021-45485 kernel: information leak in the IPv6 implementation
• BZ - 2039914 - CVE-2021-45486 kernel: information leak in the IPv4 implementation
• BZ - 2090237 - CVE-2022-21123 hw: cpu: Incomplete cleanup of multi-core shared buffers (aka SBDR)
• BZ - 2090240 - CVE-2022-21125 hw: cpu: Incomplete cleanup of microarchitectural fill buffers (aka SBDS)
• BZ - 2090241 - CVE-2022-21166 hw: cpu: Incomplete cleanup in specific special register write operations (aka DRPW)
• BZ - 2114849 - CVE-2022-2588 kernel: a use-after-free in cls_route filter implementation may lead to privilege escalation

CVEs

• CVE-2021-45485
• CVE-2021-45486
• CVE-2022-2588
• CVE-2022-21123
• CVE-2022-21125
• CVE-2022-21166

References

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