Issued:
2021-08-31
Updated:
2021-08-31

RHSA-2021:3328 - Important: kernel-rt security and bug fix update

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 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: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)

  • kernel: race condition for removal of the HCI controller (CVE-2021-32399)

  • kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation (CVE-2021-29154)

  • kernel: lack a full memory barrier upon the assignment of a new table value in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h may lead to DoS (CVE-2021-29650)

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.z8 source tree (BZ#1982927)

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

ProductVersionArch
Red Hat Enterprise Linux for Real Time7x86_64
Red Hat Enterprise Linux for Real Time for NFV7x86_64

Updated Packages

  • kernel-rt-trace-kvm-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-debug-kvm-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-debug-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-debug-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-doc-3.10.0-1160.41.1.rt56.1181.el7.noarch.rpm
  • kernel-rt-kvm-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-kvm-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-3.10.0-1160.41.1.rt56.1181.el7.src.rpm
  • kernel-rt-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-debuginfo-common-x86_64-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-trace-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-trace-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-trace-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-debug-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-trace-kvm-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-debug-kvm-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
  • kernel-rt-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm

Fixes

CVEs

References

Additional information