In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: always release netdev hooks from notifier
This reverts "netfilter: nf_tables: skip netdev events generated on netns removal".
The problem is that when a veth device is released, the veth release callback will also queue the peer netns device for removal.
Its possible that the peer netns is also slated for removal. In this case, the device memory is already released before the pre_exit hook of the peer netns runs:
BUG: KASAN: slab-use-after-free in nf_hook_entry_head+0x1b8/0x1d0 Read of size 8 at addr ffff88812c0124f0 by task kworker/u8:1/45 Workqueue: netns cleanup_net Call Trace: nf_hook_entry_head+0x1b8/0x1d0 __nf_unregister_net_hook+0x76/0x510 nft_netdev_unregister_hooks+0xa0/0x220 __nft_release_hook+0x184/0x490 nf_tables_pre_exit_net+0x12f/0x1b0 ..
Order is: 1. First netns is released, veth_dellink() queues peer netns device for removal 2. peer netns is queued for removal 3. peer netns device is released, unreg event is triggered 4. unreg event is ignored because netns is going down 5. pre_exit hook calls nft_netdev_unregister_hooks but device memory might be free'd already.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perf-debuginfoUpgrade kernel-headersUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade kernel-livepatch-5.15.117-72.142Upgrade perf-debuginfoUpgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-toolsUpgrade kernel-debuginfoUpgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade bpftool-debuginfo | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-livepatch-6.1.34-56.100Upgrade kernel-libbpf-staticUpgrade kernel-libbpfUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-libbpf-develUpgrade kernel-headersUpgrade kernel-tools-develUpgrade kernelUpgrade python3-perfUpgrade kernel-tools-debuginfoUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade perfUpgrade kernel-tools | Feb 20, 2026 | Dec 30, 2025 |
| Debian | — | Upgrade linux | Dec 31, 2025 | Dec 31, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 30, 2025 |
| Ubuntu | — | Upgrade linux-azureUpgrade linux-ibm-5.15Upgrade linux-raspiUpgrade linux-gkeUpgrade linux-gkeopUpgrade linux-nvidia-tegraUpgrade linux-nvidiaUpgrade linux-intel-iotgUpgrade linux-xilinx-zynqmpUpgrade linux-ibmUpgrade linux-azure-5.15Upgrade linux-kvmUpgrade linux-nvidia-tegra-igxUpgrade linux-oracle-5.15Upgrade linux-lowlatencyUpgrade linux-intel-iotg-5.15Upgrade linuxUpgrade linux-oracleUpgrade linux-hwe-5.15Upgrade linux-riscv-5.15Upgrade linux-gcp-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-gcpUpgrade linux-nvidia-tegra-5.15Upgrade linux-awsUpgrade linux-bluefieldUpgrade linux-realtimeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-aws-5.15Upgrade linux-azure-fde | Jan 6, 2026 | Jan 2, 2026 |
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