RHSA-2022:1209 - Security Advisory

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: remote stack overflow via kernel panic on systems using TIPC may lead to DoS (CVE-2022-0435)
• kernel: out-of-bounds read in in vc_do_resize function in drivers/tty/vt/vt.c (CVE-2020-8647)
• kernel: invalid read location in vgacon_invert_region function in drivers/video/console/vgacon.c (CVE-2020-8649)

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#2066950)

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
• Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service 8.2 x86_64

Fixes

• BZ - 1802555 - CVE-2020-8649 kernel: invalid read location in vgacon_invert_region function in drivers/video/console/vgacon.c
• BZ - 1802563 - CVE-2020-8647 kernel: out-of-bounds read in in vc_do_resize function in drivers/tty/vt/vt.c
• BZ - 2048738 - CVE-2022-0435 kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS

CVEs

• CVE-2020-8647
• CVE-2020-8649
• CVE-2022-0435

References

• https://access.redhat.com/security/updates/classification/#important