In the Linux kernel, the following vulnerability has been resolved:
net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment()
As the call trace shows, skb_panic was caused by wrong skb->mac_header in nsh_gso_segment():
invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 3 PID: 2737 Comm: syz Not tainted 6.3.0-next-20230505 #1 RIP: 0010:skb_panic+0xda/0xe0 call Trace: skb_push+0x91/0xa0 nsh_gso_segment+0x4f3/0x570 skb_mac_gso_segment+0x19e/0x270 __skb_gso_segment+0x1e8/0x3c0 validate_xmit_skb+0x452/0x890 validate_xmit_skb_list+0x99/0xd0 sch_direct_xmit+0x294/0x7c0 __dev_queue_xmit+0x16f0/0x1d70 packet_xmit+0x185/0x210 packet_snd+0xc15/0x1170 packet_sendmsg+0x7b/0xa0 sock_sendmsg+0x14f/0x160
The root cause is: nsh_gso_segment() use skb->network_header - nhoff to reset mac_header in skb_gso_error_unwind() if inner-layer protocol gso fails. However, skb->network_header may be reset by inner-layer protocol gso function e.g. mpls_gso_segment. skb->mac_header reset by the inaccurate network_header will be larger than skb headroom.
nsh_gso_segment nhoff = skb->network_header - skb->mac_header; __skb_pull(skb,nsh_len) skb_mac_gso_segment mpls_gso_segment skb_reset_network_header(skb);//skb->network_header+=nsh_len return -EINVAL; skb_gso_error_unwind skb_push(skb, nsh_len); skb->mac_header = skb->network_header - nhoff; // skb->mac_header > skb->headroom, cause skb_push panic
Use correct mac_offset to restore mac_header and get rid of nhoff.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perf-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-headersUpgrade kernelUpgrade kernel-livepatch-5.10.184-174.730Upgrade python-perfUpgrade kernel-debuginfoUpgrade kernel-livepatch-5.15.117-72.142Upgrade bpftool-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade bpftoolUpgrade perfUpgrade kernel-tools | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernel-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-libbpf-develUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-debuginfo-common-x86_64Upgrade python3-perf-debuginfoUpgrade kernel-libbpfUpgrade kernel-libbpf-staticUpgrade kernel-livepatch-6.1.34-56.100Upgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-toolsUpgrade python3-perfUpgrade perfUpgrade kernel-headersUpgrade perf-debuginfo | Feb 20, 2026 | Dec 24, 2025 |
| Debian | — | Upgrade linux | Dec 29, 2025 | Dec 29, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade bpftoolUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel | Mar 10, 2026 | Mar 10, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Dec 24, 2025 |
| Ubuntu | — | Upgrade linux-nvidia-tegra-igxUpgrade linux-ibmUpgrade linux-lowlatencyUpgrade linux-aws-5.4Upgrade linux-gcp-5.4Upgrade linux-aws-fipsUpgrade linux-azure-5.4Upgrade linux-azure-fipsUpgrade linux-iotUpgrade linux-nvidia-tegra-5.15Upgrade linux-azureUpgrade linux-oracle-5.15Upgrade linux-nvidia-tegraUpgrade linux-ibm-5.4Upgrade linux-hwe-5.15Upgrade linux-awsUpgrade linux-gkeopUpgrade linuxUpgrade linux-raspiUpgrade linux-azure-5.15Upgrade linux-gkeUpgrade linux-hwe-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-intel-iotg-5.15Upgrade linux-gcp-fipsUpgrade linux-gcp-5.15Upgrade linux-intel-iotgUpgrade linux-kvmUpgrade linux-raspi-5.4Upgrade linux-bluefieldUpgrade linux-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-gcpUpgrade linux-ibm-5.15Upgrade linux-riscv-5.15Upgrade linux-nvidiaUpgrade linux-azure-fdeUpgrade linux-oracle-5.4Upgrade linux-oracleUpgrade linux-aws-5.15Upgrade linux-realtime | Jan 6, 2026 | Dec 24, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 24, 2025 |
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