RHSA-2023:7548HighCVSS 8.8

Red Hat Security Advisory: kernel-rt security update

Published
November 28, 2023
Last Modified
November 7, 2026

🔗 CVE IDs covered (7)

CVE-2023-1192 →CVE-2023-2163 →CVE-2023-3812 →CVE-2023-5178 →CVE-2022-45884 →CVE-2022-45886 →CVE-2022-45919 →

📋 Description

CVE-2022-45884 — kernel: use-after-free due to race condition occurring in dvb_register_device() CVE-2022-45886 — kernel: use-after-free due to race condition occurring in dvb_net.c CVE-2022-45919 — kernel: use-after-free due to race condition occurring in dvb_ca_en50221.c CVE-2023-1192 — kernel: use-after-free in smb2_is_status_io_timeout() CVE-2023-2163 — kernel: bpf: Incorrect verifier pruning leads to unsafe code paths being incorrectly marked as safe CVE-2023-3812 — kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags CVE-2023-5178 — kernel: use after free in nvmet_tcp_free_crypto in NVMe

🎯 Affected products32

  • Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-0:4.18.0-513.9.1.rt7.311.el8_9.src as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-0:4.18.0-513.9.1.rt7.311.el8_9.src as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-core-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-core-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-debug-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-debug-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-debug-core-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-debug-core-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-debug-debuginfo-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-debug-debuginfo-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-debug-devel-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-debug-devel-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-debug-kvm-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-debug-modules-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-debug-modules-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-debug-modules-extra-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-debug-modules-extra-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-debuginfo-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-debuginfo-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-debuginfo-common-x86_64-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-debuginfo-common-x86_64-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-devel-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-devel-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • kernel-rt-kvm-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-modules-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV (v. 8)
  • kernel-rt-modules-0:4.18.0-513.9.1.rt7.311.el8_9.x86_64 as a component of Red Hat Enterprise Linux for Real Time (v. 8)
  • +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: To mitigate this issue, it is possible to prevent the affected code from being loaded by blacklisting the `dvb-core` kernel module. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278. 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: The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space. For Red Hat Enterprise Linux 8 to confirm the current state, inspect the sysctl with the command: # cat /proc/sys/kernel/unprivileged_bpf_disabled The setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw. Workaround: To mitigate this issue, prevent the tun module from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.

🔗 References (10)