CVE-2026-90063 (GCVE-0-2026-90063)
Vulnerability from cvelistv5
Published
2026-09-17 16:05
Modified
2026-10-19 08:57
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7c6d2ecbda83150b2036a2b36b21381ad4667762
Version: 7c6d2ecbda83150b2036a2b36b21381ad4667762
Version: 7c6d2ecbda83150b2036a2b36b21381ad4667762
Version: 7c6d2ecbda83150b2036a2b36b21381ad4667762
Version: 7c6d2ecbda83150b2036a2b36b21381ad4667762
Version: 7c6d2ecbda83150b2036a2b36b21381ad4667762
Version: 7c6d2ecbda83150b2036a2b36b21381ad4667762
Version: bfbaf151efe491e30697e21c8b7ae1b615480873
Version: 6c83456601e65a6dd371ddf595510183d198e9b1
Version: b3ebd9830c6026c98f03f7047c9d608573773f13
Version: b96fb681ca789629b8ba3da99ca3b2e6fa807f0a
Version: 4.14.187   ≤
Version: 4.19.131   ≤
Version: 5.4.46   ≤
Version: 5.6.18   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/virtio_net.h"
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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            },
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              "status": "unaffected",
              "version": "0",
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              "version": "5.15.221",
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              "status": "unaffected",
              "version": "6.1.188",
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            {
              "lessThanOrEqual": "6.6.*",
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            },
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:57:20.621Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d3d111fe809773edbb4ae121e36253b7d683509a"
        },
        {
          "url": "https://git.kernel.org/stable/c/8f6667a081887c2b59c6f3dd86c1789ada563762"
        },
        {
          "url": "https://git.kernel.org/stable/c/339f47ae04dcc6b5a730dd6bc70dddc8937c3260"
        },
        {
          "url": "https://git.kernel.org/stable/c/29bd12c7c5f9d6cf855b87bace18f71e9607f9e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e5ed3b98d1d8d251acfdccfeaa607453ad12954"
        },
        {
          "url": "https://git.kernel.org/stable/c/75c271c48f483af678e514734e10b2452410e08c"
        },
        {
          "url": "https://git.kernel.org/stable/c/c27c449d455aafd9018a3cbab150f1c42c87923f"
        }
      ],
      "title": "virtio-net: Ensure that TCP packets don\u0027t overflow gso_segs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90063",
    "datePublished": "2026-09-17T16:05:46.968Z",
    "dateReserved": "2026-09-11T19:38:34.784Z",
    "dateUpdated": "2026-10-19T08:57:20.621Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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