CVE-2026-98526 (GCVE-0-2026-98526)
Vulnerability from cvelistv5
Published
2026-10-18 15:17
Modified
2026-10-19 09:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: llc: reserve device headroom for allocated frames llc_alloc_frame() reserves link-layer headroom using the device type. This is insufficient for stacked Ethernet devices such as VLAN devices, where vlan_dev_hard_header() pushes a VLAN header before the lower device's Ethernet header. An LLC response on such a device can therefore underflow skb headroom in eth_header(). Use LL_RESERVED_SPACE() to account for the device's actual required headroom while preserving the existing LLC device-type check.
References
Impacted products
Vendor Product Version
Linux Linux Version: bf9ae5386bca8836c16e69ab8fdbe46767d7452a
Version: bf9ae5386bca8836c16e69ab8fdbe46767d7452a
Version: bf9ae5386bca8836c16e69ab8fdbe46767d7452a
Version: bf9ae5386bca8836c16e69ab8fdbe46767d7452a
Version: bf9ae5386bca8836c16e69ab8fdbe46767d7452a
Version: bf9ae5386bca8836c16e69ab8fdbe46767d7452a
Version: bf9ae5386bca8836c16e69ab8fdbe46767d7452a
Version: bf9ae5386bca8836c16e69ab8fdbe46767d7452a
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{
  "containers": {
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          "programFiles": [
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nllc: reserve device headroom for allocated frames\n\nllc_alloc_frame() reserves link-layer headroom using the device type.\nThis is insufficient for stacked Ethernet devices such as VLAN devices,\nwhere vlan_dev_hard_header() pushes a VLAN header before the lower\ndevice\u0027s Ethernet header. An LLC response on such a device can\ntherefore underflow skb headroom in eth_header().\n\nUse LL_RESERVED_SPACE() to account for the device\u0027s actual required\nheadroom while preserving the existing LLC device-type check."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:21:07.983Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/018020f5a48cc86fdd6dc2d380f6c70443ae7639"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1"
        },
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          "url": "https://git.kernel.org/stable/c/7c38524b2b2456bd33cb360420da6cbf9cad1b33"
        },
        {
          "url": "https://git.kernel.org/stable/c/1937222c2511ac91377d39f28106c34734f5f8c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/16ceac2daa89dd16917bc488ab05b9dd6961a603"
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          "url": "https://git.kernel.org/stable/c/e06f8b6e27cc616d3c587e9784c4a033eb310a16"
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          "url": "https://git.kernel.org/stable/c/3361c93e417384ebf28003e0fb6d5304653d3b05"
        },
        {
          "url": "https://git.kernel.org/stable/c/72b5b9a28b996e09b8b5b944370c79851bb68f52"
        }
      ],
      "title": "llc: reserve device headroom for allocated frames",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98526",
    "datePublished": "2026-10-18T15:17:44.018Z",
    "dateReserved": "2026-09-25T10:25:14.355Z",
    "dateUpdated": "2026-10-19T09:21:07.983Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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