RHSA-2023:4138HighCVSS 8.1

Red Hat Security Advisory: kernel-rt security and bug fix update

Published
July 18, 2023
Last Modified
August 10, 2026

🔗 CVE IDs covered (6)

CVE-2023-2002 →CVE-2023-2124 →CVE-2023-2235 →CVE-2022-1016 →CVE-2022-42703 →CVE-2022-42896 →

📋 Description

CVE-2022-1016 — kernel: uninitialized registers on stack in nft_do_chain can cause kernel pointer leakage to UM CVE-2022-42703 — kernel: use-after-free related to leaf anon_vma double reuse CVE-2022-42896 — kernel: use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c CVE-2023-2002 — Kernel: bluetooth: Unauthorized management command execution CVE-2023-2124 — kernel: OOB access in the Linux kernel's XFS subsystem CVE-2023-2235 — kernel: use-after-free vulnerability in the perf_group_detach function of the Linux Kernel Performance Events

🎯 Affected products32

  • Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-0:5.14.0-70.64.1.rt21.135.el9_0.src as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-0:5.14.0-70.64.1.rt21.135.el9_0.src as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-core-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-core-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-debug-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-debug-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-debug-core-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-debug-core-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-debug-debuginfo-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-debug-debuginfo-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-debug-devel-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-debug-devel-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-debug-kvm-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-debug-modules-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-debug-modules-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-debug-modules-extra-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-debug-modules-extra-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-debuginfo-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-debuginfo-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-debuginfo-common-x86_64-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-debuginfo-common-x86_64-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-devel-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-devel-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-kvm-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • kernel-rt-modules-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.0)
  • kernel-rt-modules-0:5.14.0-70.64.1.rt21.135.el9_0.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0)
  • +2 more not shown

✅ Remediation

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. Workaround: On non-containerized deployments of Red Hat Enterprise Linux, you can disable user namespaces by setting user.max_user_namespaces to 0: # echo "user.max_user_namespaces=0" > /etc/sysctl.d/userns.conf # sysctl -p /etc/sysctl.d/userns.conf On containerized deployments, such as Red Hat OpenShift Container Platform, do not use this mitigation as the functionality is needed to be enabled. Workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: This flaw can be mitigated by disabling Bluetooth on the operating system level. The kernel modules can be prevented from being loaded by using system-wide modprobe rules. For instructions on how to disable Bluetooth on RHEL please refer to https://access.redhat.com/solutions/2682931. Alternatively Bluetooth can be disabled within the hardware or at BIOS level which will also provide an effective mitigation as the kernel will not be able to detect that Bluetooth hardware is present on the system. Workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

🔗 References (9)