RHSA-2023:7431HighCVSS 7.8

Red Hat Security Advisory: kernel-rt security update

Published
November 21, 2023
Last Modified
July 30, 2026

🔗 CVE IDs covered (4)

CVE-2023-1829 →CVE-2023-3609 →CVE-2023-3776 →CVE-2023-4004 →

📋 Description

CVE-2023-1829 — kernel: Use-after-free vulnerability in the Linux Kernel traffic control index filter CVE-2023-3609 — kernel: net/sched: cls_u32 component reference counter leak if tcf_change_indev() fails CVE-2023-3776 — kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function CVE-2023-4004 — kernel: netfilter: use-after-free due to improper element removal in nft_pipapo_remove()

🎯 Affected products32

  • Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-0:4.18.0-193.119.1.rt13.170.el8_2.src as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-0:4.18.0-193.119.1.rt13.170.el8_2.src as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-core-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-core-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-core-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-core-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-debuginfo-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-debuginfo-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-devel-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-devel-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-kvm-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-modules-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-modules-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-modules-extra-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-modules-extra-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debuginfo-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debuginfo-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debuginfo-common-x86_64-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debuginfo-common-x86_64-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-devel-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-devel-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-kvm-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-modules-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-modules-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • +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, prevent the module cls_tcindex from being loaded. Please see https://access.redhat.com/solutions/41278 on how to blacklist a kernel module to prevent it from loading automatically. Workaround: To mitigate this issue, prevent module cls_u32 from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Workaround: To mitigate this issue, prevent module cls_fw from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Workaround: This flaw can be mitigated by preventing the affected netfilter kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.

🔗 References (7)