In the Linux kernel, the following vulnerability has been resolved:
netfilter: conntrack: Avoid nf_ct_helper_hash uses after free
If nf_conntrack_init_start() fails (for example due to a register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini() clean-up path frees the nf_ct_helper_hash map.
When built with NF_CONNTRACK=y, further netfilter modules (e.g: netfilter_conntrack_ftp) can still be loaded and call nf_conntrack_helpers_register(), independently of whether nf_conntrack initialized correctly. This accesses the nf_ct_helper_hash dangling pointer and causes a uaf, possibly leading to random memory corruption.
This patch guards nf_conntrack_helper_register() from accessing a freed or uninitialized nf_ct_helper_hash pointer and fixes possible uses-after-free when loading a conntrack module.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-headersUpgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.15.122-77.145Upgrade bpftool-debuginfoUpgrade python-perfUpgrade kernel-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-toolsUpgrade perfUpgrade kernel-tools-develUpgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade kernel-livepatch-4.14.322-244.536Upgrade kernel-livepatch-5.10.192-182.736Upgrade bpftool | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade kernelUpgrade kernel-tools-develUpgrade kernel-libbpf-develUpgrade python3-perfUpgrade kernel-livepatch-6.1.41-63.109Upgrade kernel-libbpf-staticUpgrade kernel-headersUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernel-develUpgrade perfUpgrade kernel-libbpfUpgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64 | Oct 24, 2025 | Oct 7, 2025 |
| Debian | — | Upgrade linux | Oct 9, 2025 | Oct 9, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-tools-libsUpgrade python3-perf | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade bpftoolUpgrade kernel-tools-libsUpgrade kernelUpgrade kernel-toolsUpgrade python3-perfUpgrade kernel-abi-stablelists | Feb 3, 2026 | Jan 30, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Oct 7, 2025 |
| Ubuntu | — | Upgrade linux-gkeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-awsUpgrade linux-raspi-5.4Upgrade linuxUpgrade linux-oracle-5.4Upgrade linux-riscv-5.15Upgrade linux-raspiUpgrade linux-lowlatencyUpgrade linux-bluefieldUpgrade linux-nvidia-tegraUpgrade linux-nvidia-tegra-5.15Upgrade linux-azure-fdeUpgrade linux-gcpUpgrade linux-ibm-5.15Upgrade linux-fipsUpgrade linux-aws-5.15Upgrade linux-ibm-5.4Upgrade linux-aws-5.4Upgrade linux-iotUpgrade linux-gkeopUpgrade linux-hwe-5.15Upgrade linux-azure-5.4Upgrade linux-intel-iotgUpgrade linux-nvidiaUpgrade linux-gcp-fipsUpgrade linux-intel-iotg-5.15Upgrade linux-realtimeUpgrade linux-nvidia-tegra-igxUpgrade linux-ibmUpgrade linux-oracleUpgrade linux-kvmUpgrade linux-intel-iot-realtimeUpgrade linux-gcp-5.4Upgrade linux-xilinx-zynqmpUpgrade linux-hwe-5.4Upgrade linux-oracle-5.15Upgrade linux-aws-fipsUpgrade linux-gcp-5.15Upgrade linux-azure-5.15Upgrade linux-azureUpgrade linux-azure-fips | Oct 10, 2025 | Oct 7, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Oct 7, 2025 |
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