RHSA-2024:0439HighCVSS 8.2

Red Hat Security Advisory: kernel-rt security update

Published
January 25, 2024
Last Modified
October 14, 2026

🔗 CVE IDs covered (22)

CVE-2022-3545 →CVE-2023-2162 →CVE-2023-3567 →CVE-2023-5717 →CVE-2023-6679 →CVE-2023-39191 →CVE-2023-2166 →CVE-2023-3777 →CVE-2023-4622 →CVE-2023-40283 →CVE-2023-45871 →CVE-2023-46813 →CVE-2022-41858 →CVE-2022-50879 →CVE-2023-2163 →CVE-2023-4015 →CVE-2023-20569 →CVE-2023-38409 →CVE-2023-52973 →CVE-2023-1192 →CVE-2023-2176 →CVE-2023-4623 →

📋 Description

CVE-2022-3545 — kernel: nfp: use-after-free in area_cache_get() CVE-2022-41858 — kernel: null-ptr-deref vulnerabilities in sl_tx_timeout in drivers/net/slip CVE-2022-50879 — kernel: objtool: Fix SEGFAULT CVE-2023-1192 — kernel: use-after-free in smb2_is_status_io_timeout() CVE-2023-2162 — kernel: UAF during login when accessing the shost ipaddress CVE-2023-2163 — kernel: bpf: Incorrect verifier pruning leads to unsafe code paths being incorrectly marked as safe CVE-2023-2166 — kernel: NULL pointer dereference in can_rcv_filter CVE-2023-2176 — kernel: Slab-out-of-bound read in compare_netdev_and_ip CVE-2023-3567 — kernel: use after free in vcs_read in drivers/tty/vt/vc_screen.c due to race CVE-2023-3777 — kernel: use-after-free in netfilter: nf_tables CVE-2023-4015 — kernel: use after free in nft_immediate_deactivate CVE-2023-4622 — kernel: use after free in unix_stream_sendpage CVE-2023-4623 — kernel: net/sched: sch_hfsc UAF CVE-2023-5717 — kernel: A heap out-of-bounds write when function perf_read_group is called and sibling_list is smaller than its child's sibling_list CVE-2023-6679 — kernel: NULL pointer dereference in dpll_pin_parent_pin_set() in drivers/dpll/dpll_netlink.c CVE-2023-20569 — amd: Return Address Predictor vulnerability leading to information disclosure CVE-2023-38409 — kernel: fbcon: out-of-sync arrays in fbcon_mode_deleted due to wrong con2fb_map assignment CVE-2023-39191 — kernel: eBPF: insufficient stack type checks in dynptr CVE-2023-40283 — kernel: use-after-free in l2cap_sock_release in net/bluetooth/l2cap_sock.c CVE-2023-45871 — kernel: IGB driver inadequate buffer size for frames larger than MTU CVE-2023-46813 — kernel: SEV-ES local priv escalation CVE-2023-52973 — kernel: vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF

🎯 Affected products36

  • Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-0:5.14.0-284.48.1.rt14.333.el9_2.src as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-0:5.14.0-284.48.1.rt14.333.el9_2.src as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-core-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-core-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-debug-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-debug-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-debug-core-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-debug-core-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-debug-debuginfo-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-debug-debuginfo-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-debug-devel-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-debug-devel-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-debug-kvm-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-debug-modules-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-debug-modules-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-debug-modules-core-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-debug-modules-core-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-debug-modules-extra-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-debug-modules-extra-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-debuginfo-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-debuginfo-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-debuginfo-common-x86_64-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-debuginfo-common-x86_64-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-devel-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.2)
  • kernel-rt-devel-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • kernel-rt-kvm-0:5.14.0-284.48.1.rt14.333.el9_2.x86_64 as a component of Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)
  • +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: This flaw can be mitigated by preventing the affected Netronome Flow Processor (NFP) kernel module from loading during the boot time; ensure the module is added to the blacklist file. ~~~ Refer: How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~ Workaround: This flaw can be mitigated by preventing the affected slip driver from loading during the boot time, and ensuring the module is added to the blacklist file. ~~~ Refer: How do I blacklist a kernel module to prevent it from loading automatically? 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: This flaw can be mitigated by preventing the affected iscsi_tcp.ko 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: The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space. For Red Hat Enterprise Linux 8 to confirm the current state, inspect the sysctl with the command: # cat /proc/sys/kernel/unprivileged_bpf_disabled The setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw. Workaround: Mitigation for this issue is to skip loading the affected module "netfilter" onto the system till we have a fix available, this can be done by a blacklist mechanism, this will ensure the driver is not loaded at the boot time. ~~~ How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~ Workaround: Mitigation for this issue is either not available or 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 module sch_hfsc from being loaded by blacklisting the module to prevent it from loading automatically. ~~~ https://access.redhat.com/solutions/41278 ~~~ Workaround: It is not possible to trigger this issue with the default kernel.perf_event_paranoid sysctl value 2. You may check it with: cat /proc/sys/kernel/perf_event_paranoid Workaround: Mitigation, other than installed the updated packages, 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: Mitigation for this issue is to skip loading the affected module "fbcon" onto the system until we have a fix available. This can be done by a blacklist mechanism and 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 ~~~

🔗 References (24)