CVE-2026-90063

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/0e5ed3b98d1d8d251acfdccfeaa607453ad12954
https://git.kernel.org/stable/c/29bd12c7c5f9d6cf855b87bace18f71e9607f9e8
https://git.kernel.org/stable/c/339f47ae04dcc6b5a730dd6bc70dddc8937c3260
https://git.kernel.org/stable/c/75c271c48f483af678e514734e10b2452410e08c
https://git.kernel.org/stable/c/8f6667a081887c2b59c6f3dd86c1789ada563762
https://git.kernel.org/stable/c/c27c449d455aafd9018a3cbab150f1c42c87923f
https://git.kernel.org/stable/c/d3d111fe809773edbb4ae121e36253b7d683509a

Configurations

No configuration.

History

17 Sep 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-17 17:16

Updated : 2026-09-17 17:16

NVD link : CVE-2026-90063

Mitre link : CVE-2026-90063

CVE.ORG link : CVE-2026-90063

JSON object : View

Products Affected

No product.

CWE

No CWE.

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At the\nsame time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535. When the user\ncrafts a packet with gso_size < 8, there is a risk for partial GSO to\noverflow the 16-bit gso_segs field when dividing the SKB length by\ngso_size.\n\nAdjust gso_size of TCP packets to be at least TCP_MIN_GSO_SIZE = 8. Keep\ngso_size of UDP GSO packets, as gso_size=1 is valid and explicitly\ntested at tools/testing/selftests/net/tun.c:649."}], "lastModified": "2026-09-17T17:16:55.080", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}