RHSA-2023:4021HighCVSS 7.1

Red Hat Security Advisory: kernel security and bug fix update

Published
July 11, 2023
Last Modified
November 7, 2026

🔗 CVE IDs covered (1)

CVE-2022-3564 →

📋 Description

CVE-2022-3564 — kernel: use-after-free caused by l2cap_reassemble_sdu() in net/bluetooth/l2cap_core.c

🎯 Affected products27

  • Red Hat Enterprise Linux Server AUS (v. 7.6)
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.6)
  • bpftool-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-0:3.10.0-957.104.1.el7.src as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-abi-whitelists-0:3.10.0-957.104.1.el7.noarch as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-debug-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-debug-debuginfo-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-debug-debuginfo-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional AUS (v. 7.6)
  • kernel-debug-devel-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-debuginfo-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-debuginfo-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional AUS (v. 7.6)
  • kernel-debuginfo-common-x86_64-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-debuginfo-common-x86_64-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional AUS (v. 7.6)
  • kernel-devel-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-doc-0:3.10.0-957.104.1.el7.noarch as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-tools-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-tools-debuginfo-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-tools-debuginfo-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional AUS (v. 7.6)
  • kernel-tools-libs-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • kernel-tools-libs-devel-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional AUS (v. 7.6)
  • perf-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • perf-debuginfo-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • perf-debuginfo-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional AUS (v. 7.6)
  • python-perf-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • python-perf-debuginfo-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server AUS (v. 7.6)
  • python-perf-debuginfo-0:3.10.0-957.104.1.el7.x86_64 as a component of Red Hat Enterprise Linux Server Optional AUS (v. 7.6)

✅ 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: To mitigate these vulnerabilities on the operating system level, disable the Bluetooth functionality via blocklisting kernel modules in the Linux kernel. The kernel modules can be prevented from being loaded by using system-wide modprobe rules. Instructions on how to disable Bluetooth modules are available on the Customer Portal at 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.

🔗 References (4)