Synopsis
Important: kernel-rt security and bug fix update
Type/Severity
Security Advisory: Important
Topic
An update for kernel-rt 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
- kernel: Small table perturb size in the TCP source port generation algorithm can lead to information leak (CVE-2022-1012)
- kernel: race condition in perf_event_open leads to privilege escalation (CVE-2022-1729)
- kernel: a use-after-free write in the netfilter subsystem can lead to privilege escalation to root (CVE-2022-1966)
- kernel: buffer overflow in IPsec ESP transformation code (CVE-2022-27666)
- kernel: the copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check (CVE-2020-29368)
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):
- kernel-rt: update RT source tree to the latest RHEL-8.2.z18 Batch (BZ#2081080)
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 Real Time - Telecommunications Update Service 8.2 x86_64
Fixes
-
BZ - 1903244
- CVE-2020-29368 kernel: the copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check
-
BZ - 2061633
- CVE-2022-27666 kernel: buffer overflow in IPsec ESP transformation code
-
BZ - 2064604
- CVE-2022-1012 kernel: Small table perturb size in the TCP source port generation algorithm can lead to information leak
-
BZ - 2086753
- CVE-2022-1729 kernel: race condition in perf_event_open leads to privilege escalation
-
BZ - 2092427
- CVE-2022-1966 kernel: a use-after-free write in the netfilter subsystem can lead to privilege escalation to root