RHSA-2023:4888HighCVSS 8.1

Red Hat Security Advisory: kpatch-patch security update

Published
August 30, 2023
Last Modified
August 6, 2026

🔗 CVE IDs covered (4)

CVE-2023-35788 →CVE-2022-42896 →CVE-2023-1829 →CVE-2023-3390 →

📋 Description

CVE-2022-42896 — kernel: use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c CVE-2023-1829 — kernel: Use-after-free vulnerability in the Linux Kernel traffic control index filter CVE-2023-3390 — kernel: UAF in nftables when nft_set_lookup_global triggered after handling named and anonymous sets in batch requests CVE-2023-35788 — kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt()

🎯 Affected products43

  • Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_41_1-0:1-7.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_41_1-0:1-7.el8_6.src as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_41_1-0:1-7.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_41_1-debuginfo-0:1-7.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_41_1-debuginfo-0:1-7.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_41_1-debugsource-0:1-7.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_41_1-debugsource-0:1-7.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_46_1-0:1-5.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_46_1-0:1-5.el8_6.src as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_46_1-0:1-5.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_46_1-debuginfo-0:1-5.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_46_1-debuginfo-0:1-5.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_46_1-debugsource-0:1-5.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_46_1-debugsource-0:1-5.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_51_1-0:1-4.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_51_1-0:1-4.el8_6.src as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_51_1-0:1-4.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_51_1-debuginfo-0:1-4.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_51_1-debuginfo-0:1-4.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_51_1-debugsource-0:1-4.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_51_1-debugsource-0:1-4.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_52_1-0:1-3.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_52_1-0:1-3.el8_6.src as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_52_1-0:1-3.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_52_1-debuginfo-0:1-3.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_52_1-debuginfo-0:1-3.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_52_1-debugsource-0:1-3.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_52_1-debugsource-0:1-3.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • kpatch-patch-4_18_0-372_57_1-0:1-2.el8_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.8.6)
  • +13 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 Workaround: This flaw can be mitigated by disabling Bluetooth on the operating system level. The kernel modules can be prevented from being loaded by using system-wide modprobe rules. For instructions on how to disable Bluetooth on RHEL please refer to https://access.redhat.com/solutions/2682931. Alternatively Bluetooth can be disabled within the hardware or at BIOS level which will also provide an effective mitigation as the kernel will not be able to detect that Bluetooth hardware is present on the system. Workaround: To mitigate this issue, prevent the module cls_tcindex from being loaded. Please see https://access.redhat.com/solutions/41278 on how to blacklist a kernel module to prevent it from loading automatically. Workaround: This flaw can be mitigated by preventing the affected `cls_flower` kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.

🔗 References (7)