https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-09-29T05:34:38.411839+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/cve-2026-90063 CVE-2026-90063 — virtio-net: Ensure that TCP packets don't overflow gso_segs 2026-09-29T05:34:38.425431+00:00

Affected: Linux

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.