In the Linux kernel, the following vulnerability has been resolved:
lwt: Fix return values of BPF xmit ops
BPF encap ops can return different types of positive values, such like NET_RX_DROP, NET_XMIT_CN, NETDEV_TX_BUSY, and so on, from function skb_do_redirect and bpf_lwt_xmit_reroute. At the xmit hook, such return values would be treated implicitly as LWTUNNEL_XMIT_CONTINUE in ip(6)_finish_output2. When this happens, skbs that have been freed would continue to the neighbor subsystem, causing use-after-free bug and kernel crashes.
To fix the incorrect behavior, skb_do_redirect return values can be simply discarded, the same as tc-egress behavior. On the other hand, bpf_lwt_xmit_reroute returns useful errors to local senders, e.g. PMTU information. Thus convert its return values to avoid the conflict with LWTUNNEL_XMIT_CONTINUE.
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade perfUpgrade kernel-develUpgrade python-perfUpgrade kernel-toolsUpgrade perf-debuginfoUpgrade kernel-headersUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-5.10.196-185.743Upgrade bpftoolUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.15.133-86.144Upgrade kernelUpgrade bpftool-debuginfo | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-headersUpgrade bpftool-debuginfoUpgrade kernelUpgrade bpftoolUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-libbpfUpgrade kernel-debuginfoUpgrade kernel-libbpf-staticUpgrade python3-perf-debuginfoUpgrade kernel-libbpf-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-6.1.55-75.123Upgrade perfUpgrade python3-perfUpgrade perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-toolsUpgrade kernel-develUpgrade kernel-tools-devel | Oct 16, 2025 | Sep 17, 2025 |
| Debian | — | Upgrade linux | Sep 19, 2025 | Sep 19, 2025 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernelUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade bpftoolUpgrade python3-perfUpgrade kernel-abi-stablelists | Mar 17, 2026 | Mar 17, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel-toolsUpgrade kernelUpgrade kernel-tools-libsUpgrade bpftool | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 17, 2025 |
| Ubuntu | — | Upgrade linux-bluefieldUpgrade linux-intel-iotgUpgrade linux-azure-fdeUpgrade linux-azure-5.4Upgrade linux-azureUpgrade linux-gcp-fipsUpgrade linux-riscv-5.15Upgrade linux-gcp-5.15Upgrade linux-ibmUpgrade linux-xilinx-zynqmpUpgrade linux-intel-iotg-5.15Upgrade linux-kvmUpgrade linux-lowlatency-hwe-5.15Upgrade linux-azure-5.15Upgrade linux-hwe-5.15Upgrade linux-fipsUpgrade linux-aws-fipsUpgrade linux-realtimeUpgrade linux-hwe-5.4Upgrade linux-gkeopUpgrade linux-oracleUpgrade linux-oracle-5.15Upgrade linux-lowlatencyUpgrade linux-nvidiaUpgrade linux-iotUpgrade linux-raspiUpgrade linux-ibm-5.4Upgrade linux-gcpUpgrade linux-nvidia-tegra-igxUpgrade linux-nvidia-tegraUpgrade linux-raspi-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-gkeUpgrade linux-aws-5.15Upgrade linux-gcp-5.4Upgrade linux-intel-iot-realtimeUpgrade linux-awsUpgrade linuxUpgrade linux-aws-5.4Upgrade linux-oracle-5.4Upgrade linux-ibm-5.15Upgrade linux-azure-fips | Sep 26, 2025 | Sep 17, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 17, 2025 |
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