RHSA-2023:4130HighCVSS 7.8

Red Hat Security Advisory: kernel security and bug fix update

Published
July 18, 2023
Last Modified
July 30, 2026

🔗 CVE IDs covered (4)

CVE-2022-50396 →CVE-2022-50493 →CVE-2023-1281 →CVE-2023-32233 →

📋 Description

CVE-2022-50396 — kernel: net: sched: fix memory leak in tcindex_set_parms CVE-2022-50493 — kernel: scsi: qla2xxx: Fix crash when I/O abort times out CVE-2023-1281 — kernel: tcindex: use-after-free vulnerability in traffic control index filter allows privilege escalation CVE-2023-32233 — kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation

🎯 Affected products132

  • Red Hat CodeReady Linux Builder EUS (v.8.6)
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • Red Hat Virtualization 4 Hypervisor for RHEL 8
  • bpftool-0:4.18.0-372.64.1.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • bpftool-0:4.18.0-372.64.1.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • bpftool-0:4.18.0-372.64.1.el8_6.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • bpftool-0:4.18.0-372.64.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • bpftool-debuginfo-0:4.18.0-372.64.1.el8_6.aarch64 as a component of Red Hat CodeReady Linux Builder EUS (v.8.6)
  • bpftool-debuginfo-0:4.18.0-372.64.1.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • bpftool-debuginfo-0:4.18.0-372.64.1.el8_6.ppc64le as a component of Red Hat CodeReady Linux Builder EUS (v.8.6)
  • bpftool-debuginfo-0:4.18.0-372.64.1.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • bpftool-debuginfo-0:4.18.0-372.64.1.el8_6.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • bpftool-debuginfo-0:4.18.0-372.64.1.el8_6.x86_64 as a component of Red Hat CodeReady Linux Builder EUS (v.8.6)
  • bpftool-debuginfo-0:4.18.0-372.64.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • bpftool-debuginfo-0:4.18.0-372.64.1.el8_6.x86_64 as a component of Red Hat Virtualization 4 Hypervisor for RHEL 8
  • kernel-0:4.18.0-372.64.1.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-0:4.18.0-372.64.1.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-0:4.18.0-372.64.1.el8_6.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-0:4.18.0-372.64.1.el8_6.src as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-0:4.18.0-372.64.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-abi-stablelists-0:4.18.0-372.64.1.el8_6.noarch as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-core-0:4.18.0-372.64.1.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-core-0:4.18.0-372.64.1.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-core-0:4.18.0-372.64.1.el8_6.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-core-0:4.18.0-372.64.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-debug-0:4.18.0-372.64.1.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-debug-0:4.18.0-372.64.1.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-debug-0:4.18.0-372.64.1.el8_6.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-debug-0:4.18.0-372.64.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kernel-debug-core-0:4.18.0-372.64.1.el8_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • +102 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 traffic control index filter (cls_tcindex) kernel module from loading during the boot time, ensure the module is added into the blacklist file. ~~~ Refer: How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~ Workaround: 1. This flaw can be mitigated by preventing the affected netfilter (nf_tables) kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278. 2. If the module cannot be disabled, on non-containerized deployments of Red Hat Enterprise Linux, the mitigation is to disable user namespaces: ``` # 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 the second mitigation (disabling user namespaces) as the functionality is needed to be enabled. The first mitigation (blacklisting nf_tables) is still viable for containerized deployments, providing the environment is not using netfilter.

🔗 References (5)