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