Headline
RHSA-2022:5236: Red Hat Security Advisory: kernel-rt security and bug fix update
An update for kernel-rt is now available for Red Hat Enterprise Linux 7. 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.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
Related CVEs:
- CVE-2022-1729: kernel: race condition in perf_event_open leads to privilege escalation
- CVE-2022-1966: kernel: a use-after-free write in the netfilter subsystem can lead to privilege escalation to root
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Issued:
2022-06-28
Updated:
2022-06-28
RHSA-2022:5236 - Security Advisory
- Overview
- Updated Packages
Synopsis
Important: kernel-rt security and bug fix update
Type/Severity
Security Advisory: Important
Red Hat Insights patch analysis
Identify and remediate systems affected by this advisory.
View affected systems
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 7.
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: 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)
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 to the latest RHEL7.9.z15 source tree (BZ#2081074)
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 7 x86_64
Fixes
- 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
Red Hat Enterprise Linux for Real Time 7
SRPM
x86_64
kernel-rt-3.10.0-1160.71.1.rt56.1212.el7.x86_64.rpm
SHA-256: 71f760a015470fb9ceb26d73dbd9b495ad5b33f2f076e9ee4df11d44faacc7bd
kernel-rt-debug-3.10.0-1160.71.1.rt56.1212.el7.x86_64.rpm
SHA-256: c842835cfca9f14c80b34a944d00152399b9c21ccacae21eb0204e4ae6c15b52
kernel-rt-debug-devel-3.10.0-1160.71.1.rt56.1212.el7.x86_64.rpm
SHA-256: c19cafadf513bd1af509b05a785b873e9295bc13275ac8d0988eb2a294393224
kernel-rt-devel-3.10.0-1160.71.1.rt56.1212.el7.x86_64.rpm
SHA-256: dca28a6c0d4bb8b1072d1717d730caec9ec933e978952c2b61c3dd1fdfa8049e
kernel-rt-doc-3.10.0-1160.71.1.rt56.1212.el7.noarch.rpm
SHA-256: 8b12006a079210edc8a943762cfb8b1a01257fd562c879781002463d7e5360f0
kernel-rt-trace-3.10.0-1160.71.1.rt56.1212.el7.x86_64.rpm
SHA-256: 14ecad3af007a77702c1eb5672c21e4304e6043279f875a29ed8e68bae79fbbe
kernel-rt-trace-devel-3.10.0-1160.71.1.rt56.1212.el7.x86_64.rpm
SHA-256: 67a516dd4d397810691e8bc015d9f3cfeced18838796d008b32fcd82930802c2
The Red Hat security contact is [email protected]. More contact details at https://access.redhat.com/security/team/contact/.
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Ubuntu Security Notice 5466-1 - It was discovered that the Linux kernel did not properly restrict access to the kernel debugger when booted in secure boot environments. A privileged attacker could use this to bypass UEFI Secure Boot restrictions. Aaron Adams discovered that the netfilter subsystem in the Linux kernel did not properly handle the removal of stateful expressions in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code.
Ubuntu Security Notice 5465-1 - It was discovered that the Linux kernel did not properly restrict access to the kernel debugger when booted in secure boot environments. A privileged attacker could use this to bypass UEFI Secure Boot restrictions. Aaron Adams discovered that the netfilter subsystem in the Linux kernel did not properly handle the removal of stateful expressions in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code.
A use-after-free vulnerability was found in the Linux kernel's Netfilter subsystem in net/netfilter/nf_tables_api.c. This flaw allows a local attacker with user access to cause a privilege escalation issue.