RHSA-2023:6813HighCVSS 7.8

Red Hat Security Advisory: kernel security and bug fix update

Published
November 8, 2023
Last Modified
July 30, 2026

🔗 CVE IDs covered (4)

CVE-2023-1095 →CVE-2023-3609 →CVE-2023-3776 →CVE-2023-3812 →

📋 Description

CVE-2023-1095 — kernel: netfilter: NULL pointer dereference in nf_tables due to zeroed list head 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-2023-3812 — kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags

🎯 Affected products48

  • Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • bpftool-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • bpftool-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • bpftool-debuginfo-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • bpftool-debuginfo-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-0:4.18.0-147.94.1.el8_1.src as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-abi-whitelists-0:4.18.0-147.94.1.el8_1.noarch as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-core-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-core-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-core-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-core-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-debuginfo-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-debuginfo-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-devel-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-devel-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-modules-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-modules-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-modules-extra-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debug-modules-extra-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debuginfo-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debuginfo-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debuginfo-common-ppc64le-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-debuginfo-common-x86_64-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-devel-0:4.18.0-147.94.1.el8_1.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-devel-0:4.18.0-147.94.1.el8_1.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • kernel-doc-0:4.18.0-147.94.1.el8_1.noarch as a component of Red Hat Enterprise Linux BaseOS E4S (v. 8.1)
  • +18 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: 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. 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: 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 (7)