In the Linux kernel, the following vulnerability has been resolved:
net: gro: fix outer network offset
The udp GRO complete stage assumes that all the packets inserted the RX have the `encapsulation` flag zeroed. Such assumption is not true, as a few H/W NICs can set such flag when H/W offloading the checksum for an UDP encapsulated traffic, the tun driver can inject GSO packets with UDP encapsulation and the problematic layout can also be created via a veth based setup.
Due to the above, in the problematic scenarios, udp4_gro_complete() uses the wrong network offset (inner instead of outer) to compute the outer UDP header pseudo checksum, leading to csum validation errors later on in packet processing.
Address the issue always clearing the encapsulation flag at GRO completion time. Such flag will be set again as needed for encapsulated packets by udp_gro_complete().
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade bpftool6.12-debuginfoUpgrade bpftool6.12Upgrade kernel6.18-debuginfoUpgrade kernel6.18-libbpf-develUpgrade python3-perf6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel-livepatch-6.18.15-14.217Upgrade kernel6.12-debuginfoUpgrade kernel6.18-libbpfUpgrade kernel6.18-develUpgrade kernel6.18-toolsUpgrade python3-perf6.12-debuginfoUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.12-toolsUpgrade kernel6.12-libbpf-staticUpgrade perf6.12-debuginfoUpgrade kernel6.12-libbpfUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-libbpf-develUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-tools-develUpgrade kernel6.18-modules-extraUpgrade kernel6.18-headersUpgrade kernel6.18-libbpf-staticUpgrade kernel6.12-modules-extra-commonUpgrade kernel6.12-libbpf-debuginfoUpgrade python3-perf6.12Upgrade kernel6.18-tools-debuginfoUpgrade kernel6.12-tools-develUpgrade kernel6.18Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-modules-extraUpgrade kernel6.12-headersUpgrade kernel6.12Upgrade bpftool6.18Upgrade kernel-livepatch-6.12.73-95.123Upgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.12-develUpgrade python3-perf6.18Upgrade kernel6.18-libbpf-debuginfoUpgrade perf6.18Upgrade kernel6.18-modules-extra-commonUpgrade perf6.12Upgrade kernel6.12-debuginfo-common-aarch64 | Mar 30, 2026 | Mar 18, 2026 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1056-raspiUpgrade linux-image-raspi-6.8Upgrade linux-image-generic-6.8Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-realtimeUpgrade linux-image-nvidia-64kUpgrade linux-image-virtual-6.8Upgrade linux-image-6.8.0-1059-azure-fipsUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-kvmUpgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-gkeUpgrade linux-image-gke-64kUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-raspi-realtimeUpgrade linux-image-intel-iotgUpgrade linux-image-6.8.0-1056-azureUpgrade linux-image-xilinxUpgrade linux-image-aws-fips-6.8Upgrade linux-image-generic-64k-6.8Upgrade linux-image-6.8.0-1024-nvidia-tegraUpgrade linux-image-azure-fipsUpgrade linux-image-azure-6.8Upgrade linux-image-fips-6.8Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-gcp-fipsUpgrade linux-image-gke-6.8Upgrade linux-image-raspiUpgrade linux-image-azureUpgrade linux-image-gcp-lts-24.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-gke-64k-6.8Upgrade linux-image-azure-fips-6.8Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-6.8.0-1055-awsUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-aws-6.8Upgrade linux-image-6.8.0-1054-nvidiaUpgrade linux-image-realtime-hwe-22.04Upgrade linux-image-6.8.0-1024-nvidia-tegra-rtUpgrade linux-image-realtime-6.8.1Upgrade linux-image-xilinx-6.8Upgrade linux-image-6.8.0-1055-aws-64kUpgrade linux-image-6.8.1-1051-realtimeUpgrade linux-image-6.8.0-1054-nvidia-lowlatencyUpgrade linux-image-aws-lts-24.04Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-nvidia-6.8Upgrade linux-image-fipsUpgrade linux-image-6.8.0-1055-ibmUpgrade linux-image-nvidiaUpgrade linux-image-6.8.0-1058-gcp-fipsUpgrade linux-image-6.8.0-1058-gcp-64kUpgrade linux-image-6.8.0-1054-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1054-gke-64kUpgrade linux-image-6.8.0-1041-gkeopUpgrade linux-image-nvidia-tegraUpgrade linux-image-6.8.0-1054-nvidia-64kUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-6.8.0-1032-xilinxUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-lowlatency-6.8Upgrade linux-image-generic-lpaeUpgrade linux-image-azure-lts-24.04Upgrade linux-image-6.8.0-1059-azureUpgrade linux-image-6.8.0-117-lowlatencyUpgrade linux-image-6.8.0-1058-gcpUpgrade linux-image-lowlatency-64kUpgrade linux-image-raspi-realtime-6.8Upgrade linux-image-gkeopUpgrade linux-image-gkeop-6.8Upgrade linux-image-6.8.0-117-generic-64kUpgrade linux-image-6.8.0-1055-aws-fipsUpgrade linux-image-6.8.0-117-lowlatency-64kUpgrade linux-image-lowlatencyUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-1054-gkeUpgrade linux-image-aws-fipsUpgrade linux-image-6.8.0-2045-raspi-realtimeUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-ibmUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.8.0-116-fipsUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-generic-64kUpgrade linux-image-nvidia-tegra-rtUpgrade linux-image-genericUpgrade linux-image-ibm-classicUpgrade linux-image-6.8.0-117-genericUpgrade linux-image-gcp-6.8Upgrade linux-image-ibm-6.8Upgrade linux-image-virtual | May 25, 2026 | May 19, 2026 |
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