RedHat: RHSA-2022-0821:01 Important: kernel-rt security and bug fix update
Summary
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: improper initialization of the "flags" member of the new
pipe_buffer (CVE-2022-0847)
* 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: cgroups v1 release_agent feature may allow privilege escalation
(CVE-2022-0492)
* 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.
Bug Fix(es):
* kernel-rt: update RT source tree to the latest RHEL-8.2.z16 Batch
(BZ#2057698)
Summary
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.
References
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-2022-0492 https://access.redhat.com/security/cve/CVE-2022-0847 https://access.redhat.com/security/cve/CVE-2022-22942 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/RHSB-2022-002
Package List
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2):
Source:
kernel-rt-4.18.0-193.79.1.rt13.129.el8_2.src.rpm
x86_64:
kernel-rt-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-kvm-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v. 8.2):
Source:
kernel-rt-4.18.0-193.79.1.rt13.129.el8_2.src.rpm
x86_64:
kernel-rt-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2Extended Update Support.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.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux Real Time EUS (v. 8.2) - x86_64
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) - x86_64
Bugs Fixed
2029923 - CVE-2021-4083 kernel: fget: check that the fd still exists after getting a ref to it
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
2051505 - CVE-2022-0492 kernel: cgroups v1 release_agent feature may allow privilege escalation
2060795 - CVE-2022-0847 kernel: improper initialization of the "flags" member of the new pipe_buffer