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 kernel6.12-develUpgrade kernel6.18Upgrade python3-perf6.18Upgrade kernel-livepatch-6.12.73-95.123Upgrade bpftool6.18Upgrade kernel6.12-tools-develUpgrade kernel6.18-tools-debuginfoUpgrade kernel6.12Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-modules-extra-commonUpgrade kernel6.18-debuginfo-common-aarch64Upgrade kernel6.12-headersUpgrade kernel6.12-libbpf-debuginfoUpgrade kernel6.18-modules-extra-commonUpgrade perf6.12Upgrade kernel6.12-modules-extraUpgrade perf6.18Upgrade python3-perf6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.18-libbpf-debuginfoUpgrade kernel-livepatch-6.18.15-14.217Upgrade kernel6.18-libbpf-develUpgrade kernel6.18-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade perf6.12-debuginfoUpgrade kernel6.18-toolsUpgrade kernel6.12-libbpf-develUpgrade kernel6.18-tools-develUpgrade kernel6.12-libbpfUpgrade kernel6.18-headersUpgrade kernel6.12-toolsUpgrade kernel6.18-develUpgrade kernel6.18-libbpf-staticUpgrade bpftool6.18-debuginfoUpgrade kernel6.18-modules-extraUpgrade bpftool6.12-debuginfoUpgrade bpftool6.12Upgrade python3-perf6.18-debuginfoUpgrade perf6.18-debuginfoUpgrade kernel6.18-libbpfUpgrade kernel6.12-debuginfoUpgrade kernel6.12-libbpf-staticUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.12-tools-debuginfo | Mar 30, 2026 | Mar 18, 2026 |
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Ubuntu | — | Upgrade linux-image-aws-64k-lts-24.04Upgrade linux-image-gcp-fipsUpgrade linux-image-aws-6.8Upgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-aws-64k-6.8Upgrade linux-image-gcp-lts-24.04Upgrade linux-image-azureUpgrade linux-image-raspiUpgrade linux-image-gke-6.8Upgrade linux-image-gcp-64k-6.8Upgrade linux-image-azure-fips-6.8Upgrade linux-image-realtimeUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-6.8.1-1051-realtimeUpgrade linux-image-xilinx-6.8Upgrade linux-image-realtime-hwe-22.04Upgrade linux-image-realtime-6.8.1Upgrade linux-image-nvidia-6.8Upgrade linux-image-aws-lts-24.04Upgrade linux-image-gcp-fips-6.8Upgrade linux-image-6.8.0-1054-nvidiaUpgrade linux-image-6.8.0-1024-nvidia-tegra-rtUpgrade linux-image-virtual-6.8Upgrade linux-image-azure-fipsUpgrade linux-image-6.8.0-1059-azure-fipsUpgrade linux-image-6.8.0-1056-raspiUpgrade linux-image-6.8.0-1055-aws-64kUpgrade linux-image-6.8.0-1056-azureUpgrade linux-image-kvmUpgrade linux-image-gke-64kUpgrade linux-image-intel-iotgUpgrade linux-image-generic-64k-6.8Upgrade linux-image-gke-64k-6.8Upgrade linux-image-nvidia-lowlatency-64k-6.8Upgrade linux-image-6.8.0-1054-nvidia-lowlatencyUpgrade linux-image-generic-6.8Upgrade linux-image-azure-6.8Upgrade linux-image-fips-6.8Upgrade linux-image-6.8.0-1055-awsUpgrade linux-image-xilinxUpgrade linux-image-gkeUpgrade linux-image-lowlatency-64k-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-aws-fips-6.8Upgrade linux-image-raspi-realtimeUpgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-raspi-6.8Upgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1024-nvidia-tegraUpgrade linux-image-intel-iot-realtimeUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1054-gke-64kUpgrade linux-image-gkeop-6.8Upgrade linux-image-raspi-realtime-6.8Upgrade linux-image-gkeopUpgrade linux-image-6.8.0-1058-gcp-64kUpgrade linux-image-6.8.0-1058-gcp-fipsUpgrade linux-image-fipsUpgrade linux-image-gcp-6.8Upgrade linux-image-ibm-6.8Upgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-6.8.0-1054-nvidia-64kUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-nvidiaUpgrade linux-image-generic-64kUpgrade linux-image-lowlatency-6.8Upgrade linux-image-nvidia-tegra-6.8Upgrade linux-image-ibm-classicUpgrade linux-image-nvidia-lowlatency-6.8Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-6.8.0-1059-azureUpgrade linux-image-azure-lts-24.04Upgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-116-fipsUpgrade linux-image-6.8.0-1054-gkeUpgrade linux-image-6.8.0-2045-raspi-realtimeUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-aws-fipsUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-xilinx-zynqmpUpgrade linux-image-6.8.0-117-genericUpgrade linux-image-6.8.0-1058-gcpUpgrade linux-image-6.8.0-117-lowlatencyUpgrade linux-image-ibmUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-117-generic-64kUpgrade linux-image-6.8.0-1055-aws-fipsUpgrade linux-image-6.8.0-1032-xilinxUpgrade linux-image-6.8.0-1055-ibmUpgrade linux-image-6.8.0-1054-nvidia-lowlatency-64kUpgrade linux-image-gcp-64k-lts-24.04Upgrade linux-image-6.8.0-1041-gkeopUpgrade linux-image-genericUpgrade linux-image-nvidia-tegraUpgrade linux-image-6.8.0-117-lowlatency-64kUpgrade linux-image-lowlatency | May 25, 2026 | May 19, 2026 |
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