RHSA-2022:6991 — Security Advisory

An update for kernel-rt 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.

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

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):

• update RT source tree to the RHEL-8.4.z12 source tree (BZ#2119160)

• using __this_cpu_add() in preemptible [00000000] - caller is __mod_memcg_lruvec_state+0x69/0x1c0 [None8.4.0.z] (BZ#2124454)