CVE-2026-90114 (GCVE-0-2026-90114)
Vulnerability from cvelistv5
Published
2026-09-17 16:06
Modified
2026-10-19 08:58
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: bridge: Reject descending VLAN tunnel ranges A pair of descending VLAN and tunnel IDs can pass the tunnel range span check. The VLAN subtraction produces a negative int, which is converted to unsigned when compared with the u32 tunnel ID subtraction. It can therefore equal the wrapped tunnel ID delta. The range loop then performs no iterations. Since the batched notification handling added a post-loop error check, this leaves err uninitialized and makes the request's return value unpredictable. Reject descending VLAN ranges before comparing the spans. Valid ascending and single-entry ranges remain unchanged, while malformed descending ranges consistently return -EINVAL. This issue was found by a static analysis checker and confirmed by manual source review.
References
Impacted products
Vendor Product Version
Linux Linux Version: 94339443686b36d3223bc032b7947267474e2679
Version: 94339443686b36d3223bc032b7947267474e2679
Version: 94339443686b36d3223bc032b7947267474e2679
Version: 94339443686b36d3223bc032b7947267474e2679
Version: 94339443686b36d3223bc032b7947267474e2679
Version: 94339443686b36d3223bc032b7947267474e2679
Version: 94339443686b36d3223bc032b7947267474e2679
Version: 94339443686b36d3223bc032b7947267474e2679
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: Reject descending VLAN tunnel ranges\n\nA pair of descending VLAN and tunnel IDs can pass the tunnel range span\ncheck. The VLAN subtraction produces a negative int, which is converted\nto unsigned when compared with the u32 tunnel ID subtraction. It can\ntherefore equal the wrapped tunnel ID delta.\n\nThe range loop then performs no iterations. Since the batched\nnotification handling added a post-loop error check, this leaves err\nuninitialized and makes the request\u0027s return value unpredictable.\n\nReject descending VLAN ranges before comparing the spans. Valid\nascending and single-entry ranges remain unchanged, while malformed\ndescending ranges consistently return -EINVAL.\n\nThis issue was found by a static analysis checker and confirmed by\nmanual source review."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:58:12.785Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/0874a6d5275091429ec4c675c54c53a8776665ae"
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          "url": "https://git.kernel.org/stable/c/bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17"
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        },
        {
          "url": "https://git.kernel.org/stable/c/b74a072d8fb71d3c9ffba4a17d5943e63266fb38"
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      "title": "net: bridge: Reject descending VLAN tunnel ranges",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90114",
    "datePublished": "2026-09-17T16:06:20.741Z",
    "dateReserved": "2026-09-11T19:38:34.787Z",
    "dateUpdated": "2026-10-19T08:58:12.785Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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