RHSA-2024:2008HighCVSS 7.8

Red Hat Security Advisory: kernel-rt security update

Published
April 23, 2024
Last Modified
August 4, 2026

🔗 CVE IDs covered (7)

CVE-2024-26586 →CVE-2024-26602 →CVE-2021-46915 →CVE-2023-1192 →CVE-2023-3812 →CVE-2023-4459 →CVE-2023-7192 →

📋 Description

CVE-2021-46915 — kernel: netfilter: divide error in nft_limit_init CVE-2023-1192 — kernel: use-after-free in smb2_is_status_io_timeout() CVE-2023-3812 — kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags CVE-2023-4459 — kernel: vmxnet3: NULL pointer dereference in vmxnet3_rq_cleanup() CVE-2023-7192 — kernel: refcount leak in ctnetlink_create_conntrack() CVE-2024-26586 — kernel: mlxsw: spectrum_acl_tcam: Fix stack corruption CVE-2024-26602 — kernel: sched/membarrier: reduce the ability to hammer on sys_membarrier

🎯 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-0:4.18.0-193.133.1.rt13.184.el8_2.src as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-0:4.18.0-193.133.1.rt13.184.el8_2.src as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-core-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-core-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-core-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-core-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-debuginfo-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-debuginfo-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-devel-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-devel-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-kvm-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debug-modules-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-modules-0:4.18.0-193.133.1.rt13.184.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-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debug-modules-extra-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-debuginfo-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debuginfo-0:4.18.0-193.133.1.rt13.184.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_64-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-debuginfo-common-x86_64-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-devel-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-devel-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-kvm-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
  • kernel-rt-modules-0:4.18.0-193.133.1.rt13.184.el8_2.x86_64 as a component of Red Hat Enterprise Linux Real Time TUS (v. 8.2)
  • kernel-rt-modules-0:4.18.0-193.133.1.rt13.184.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: 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, 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. Workaround: In order to mitigate this issue, prevent the affected code from being loaded by blacklisting the kernel module "vmxnet3". For instructions relating to how to blacklist a kernel module refer to: https://access.redhat.com/solutions/41278 ~~~ Exploiting this flaw will require CAP_NET_ADMIN access privilege in any user or network namespace. ~~~ Workaround: Triggering this issue 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. Alternatively, skip loading the affected netfilter module (i.e., nf_conntrack_netlink) onto the system until we have a fix available. This can be done by a blacklist mechanism which will ensure the driver is not loaded at boot time. ~~~ How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~ Workaround: To mitigate this issue, prevent the mlxsw_spectrum module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on blacklisting a kernel module to prevent it from loading automatically.

🔗 References (10)