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In the Linux kernel, the following vulnerability has been resolved:
virtio-net: Ensure that TCP packets don't overflow gso_segs
The user can specify any gso_size in a packet crafted with an AF_PACKET PACKET_VNET_HDR socket, even smaller than TCP_MIN_GSO_SIZE = 8. At the same time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535. When the user crafts a packet with gso_size < 8, there is a risk for partial GSO to overflow the 16-bit gso_segs field when dividing the SKB length by gso_size.
Adjust gso_size of TCP packets to be at least TCP_MIN_GSO_SIZE = 8. Keep gso_size of UDP GSO packets, as gso_size=1 is valid and explicitly tested at tools/testing/selftests/net/tun.c:649.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade perfUpgrade kernel-headersUpgrade kernel-toolsUpgrade kernel-tools-develUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade python-perf-debuginfoUpgrade python-perfUpgrade bpftool-debuginfoUpgrade bpftoolUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debuginfoUpgrade kernel-develUpgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-5.15.221-157.262 | Oct 19, 2026 | Oct 19, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel-modules-extraUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade bpftool6.18Upgrade bpftool-debuginfoUpgrade perfUpgrade kernel6.18-debuginfo-common-aarch64Upgrade bpftool6.18-debuginfoUpgrade bpftoolUpgrade kernel-livepatch-6.1.188-233.385Upgrade kernel-livepatch-6.18.54-121.166Upgrade kernel-modules-extra-commonUpgrade kernel-toolsUpgrade kernel6.18-develUpgrade kernel6.18-modules-extra-commonUpgrade kernel-tools-debuginfoUpgrade perf6.18Upgrade microvm-kernel6.18Upgrade kernel6.18-tools-develUpgrade python3-perfUpgrade kernel-headersUpgrade kernelUpgrade kernel-debuginfoUpgrade kernel-develUpgrade kernel6.18-headersUpgrade kernel6.18-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-x86_64Upgrade perf6.18-debuginfoUpgrade kernel6.18-modules-extraUpgrade kernel6.18Upgrade python3-perf6.18-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel6.18-toolsUpgrade python3-perf6.18Upgrade kernel6.18-tools-debuginfo | Oct 20, 2026 | Sep 17, 2026 |
| Debian | — | Upgrade linuxUpgrade linux-6.12 | Sep 30, 2026 | Sep 17, 2026 |
| Ubuntu | — | Upgrade linux-azure-fipsUpgrade linux-lowlatencyUpgrade linux-hwe-5.15Upgrade linux-riscv-7.0Upgrade linux-awsUpgrade linux-aws-5.15Upgrade linux-azureUpgrade linux-nvidia-tegra-5.15Upgrade linuxUpgrade linux-aws-fipsUpgrade linux-oracle-5.15Upgrade linux-gkeopUpgrade linux-azure-fde-5.15Upgrade linux-riscvUpgrade linux-intel-iotgUpgrade linux-realtimeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-nvidiaUpgrade linux-gcp-fipsUpgrade linux-gcpUpgrade linux-gcp-5.15Upgrade linux-ibmUpgrade linux-intel-iot-realtimeUpgrade linux-ibm-5.15Upgrade linux-hwe-7.0Upgrade linux-azure-5.15Upgrade linux-oem-7.0Upgrade linux-azure-fdeUpgrade linux-riscv-5.15Upgrade linux-kvmUpgrade linux-fipsUpgrade linux-gkeUpgrade linux-bluefieldUpgrade linux-oracleUpgrade linux-nvidia-tegra-igxUpgrade linux-intel-iotg-5.15Upgrade linux-nvidia-tegra | Nov 3, 2026 | Sep 17, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Sep 30, 2026 | Sep 17, 2026 |
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