GHSA-86WJ-V2PM-25HQ
Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-17 18:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-90063"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:16:55Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio-net: Ensure that TCP packets don\u0027t overflow gso_segs\n\nThe user can specify any gso_size in a packet crafted with an AF_PACKET\nPACKET_VNET_HDR socket, even smaller than TCP_MIN_GSO_SIZE = 8. At the\nsame time, GSO_MAX_SIZE = 8 * GSO_MAX_SEGS = 8 * 65535. When the user\ncrafts a packet with gso_size \u003c 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.",
"id": "GHSA-86wj-v2pm-25hq",
"modified": "2026-09-17T18:31:49Z",
"published": "2026-09-17T18:31:49Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90063"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0e5ed3b98d1d8d251acfdccfeaa607453ad12954"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/29bd12c7c5f9d6cf855b87bace18f71e9607f9e8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/339f47ae04dcc6b5a730dd6bc70dddc8937c3260"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/75c271c48f483af678e514734e10b2452410e08c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8f6667a081887c2b59c6f3dd86c1789ada563762"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c27c449d455aafd9018a3cbab150f1c42c87923f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d3d111fe809773edbb4ae121e36253b7d683509a"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date | Other |
|---|
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