RHSA-2023:5091HighCVSS 7.8

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

Published
September 12, 2023
Last Modified
October 15, 2026

🔗 CVE IDs covered (10)

CVE-2023-31248 →CVE-2023-1637 →CVE-2023-3390 →CVE-2023-3610 →CVE-2023-4004 →CVE-2023-21102 →CVE-2023-35001 →CVE-2023-3776 →CVE-2023-4147 →CVE-2023-20593 →

📋 Description

CVE-2023-1637 — kernel: save/restore speculative MSRs during S3 suspend/resume CVE-2023-3390 — kernel: UAF in nftables when nft_set_lookup_global triggered after handling named and anonymous sets in batch requests CVE-2023-3610 — kernel: netfilter: nf_tables: fix chain binding transaction logic in the abort path of NFT_MSG_NEWRULE 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() CVE-2023-4147 — kernel: netfilter: nf_tables_newrule when adding a rule with NFTA_RULE_CHAIN_ID leads to use-after-free CVE-2023-20593 — hw: amd: Cross-Process Information Leak CVE-2023-21102 — kernel: bypass of shadow stack protection due to a logic error CVE-2023-31248 — kernel: nf_tables: use-after-free in nft_chain_lookup_byid() CVE-2023-35001 — kernel: nf_tables: stack-out-of-bounds-read in nft_byteorder_eval()

🎯 Affected products36

  • Red Hat Enterprise Linux NFV (v. 9)
  • Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-0:5.14.0-284.30.1.rt14.315.el9_2.src as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-0:5.14.0-284.30.1.rt14.315.el9_2.src as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-core-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-core-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-debug-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-debug-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-debug-core-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-debug-core-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-debug-debuginfo-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-debug-debuginfo-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-debug-devel-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-debug-devel-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-debug-kvm-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-debug-modules-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-debug-modules-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-debug-modules-core-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-debug-modules-core-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-debug-modules-extra-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-debug-modules-extra-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-debuginfo-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-debuginfo-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-debuginfo-common-x86_64-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-debuginfo-common-x86_64-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-devel-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • kernel-rt-devel-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux RT (v. 9)
  • kernel-rt-kvm-0:5.14.0-284.30.1.rt14.315.el9_2.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 9)
  • +6 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: In order to trigger the issue, it requires the ability to create user/net namespaces. On non-containerized deployments of Red Hat Enterprise Linux 8, 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: 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. 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: To mitigate this issue, it is possible to prevent the affected code from being loaded by blacklisting the kernel netfilter module. For instructions relating to how to blacklist a kernel module refer to: https://access.redhat.com/solutions/41278

🔗 References (13)