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Red Hat Enterprise Linux 7.6: RHSA-2022:1107-01 Important Kernel Update

red hat
Calendar Grey March 29, 2022
Dist Redhat Esm H88
Essential kernel upgrade for Red Hat Enterprise Linux aimed at rectifying significant security vulnerabilities and mitigating privilege escalation threats.
An update for kernel is now available for Red Hat Enterprise Linux 7.6 Advanced Update Support, Red Hat Enterprise Linux 7.6 Telco Extended Update Support, and Red Hat Enterprise L...

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.

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920)
* kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)
* kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330)
* kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942)
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.

Topics%20covered

Topics Covered

security advisory kernel update privilege escalation security impact red hat enterprise linux

References

https://access.redhat.com/security/cve/CVE-2021-0920 https://access.redhat.com/security/cve/CVE-2021-4083 https://access.redhat.com/security/cve/CVE-2022-0330 https://access.redhat.com/security/cve/CVE-2022-22942 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Server AUS (v. 7.6):
Source: kernel-3.10.0-957.92.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-957.92.1.el7.noarch.rpm kernel-doc-3.10.0-957.92.1.el7.noarch.rpm
x86_64: bpftool-3.10.0-957.92.1.el7.x86_64.rpm kernel-3.10.0-957.92.1.el7.x86_64.rpm kernel-debug-3.10.0-957.92.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-957.92.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-957.92.1.el7.x86_64.rpm kernel-devel-3.10.0-957.92.1.el7.x86_64.rpm kernel-headers-3.10.0-957.92.1.el7.x86_64.rpm kernel-tools-3.10.0-957.92.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-957.92.1.el7.x86_64.rpm perf-3.10.0-957.92.1.el7.x86_64.rpm perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm python-perf-3.10.0-957.92.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
Red Hat Enterprise Linux Server E4S (v. 7.6):
Source: kernel-3.10.0-957.92.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-957.92.1.el7.noarch.rpm kernel-doc-3.10.0-957.92.1.el7.noarch.rpm
ppc64le: kernel-3.10.0-957.92.1.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-957.92.1.el7.ppc64le.rpm kernel-debug-3.10.0-957.92.1.el7.ppc64le.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2022:1107-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:1107
Issue date: 2022-03-29

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.6Advanced Update Support, Red Hat Enterprise Linux 7.6 Telco Extended UpdateSupport, and Red Hat Enterprise Linux 7.6 Update Services for SAPSolutions.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory kernel update privilege escalation security impact red hat enterprise linux

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 7.6) - noarch, x86_64

Red Hat Enterprise Linux Server E4S (v. 7.6) - noarch, ppc64le, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 7.6) - x86_64

Red Hat Enterprise Linux Server Optional E4S (v. 7.6) - ppc64le, x86_64

Red Hat Enterprise Linux Server Optional TUS (v. 7.6) - x86_64

Red Hat Enterprise Linux Server TUS (v. 7.6) - noarch, x86_64

Bugs Fixed

2029923 - CVE-2021-4083 kernel: fget: check that the fd still exists after getting a ref to it

2031930 - CVE-2021-0920 kernel: Use After Free in unix_gc() which could result in a local privilege escalation

2042404 - CVE-2022-0330 kernel: possible privileges escalation due to missing TLB flush

2044809 - CVE-2022-22942 kernel: failing usercopy allows for use-after-free exploitation

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