CVE-2026-90226 (GCVE-0-2026-90226)
Vulnerability from cvelistv5
Published
2026-09-17 16:07
Modified
2026-10-19 09:00
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: avoid userspace overflow on invalid optlen nfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so the kernel always stores 4 bytes regardless of the caller-supplied optlen. The existing min_t(u32, len, sizeof(u32)) only clamps the length reported back to userspace; it does not constrain the store. A call with optlen < 4 therefore writes past the user buffer, violating the getsockopt(2) contract for all five supported optnames. Reject any call with optlen < sizeof(u32) up front. 'len' is int, so a plain size comparison would promote a negative optlen to size_t and slip past the check; an explicit 'len < 0' test is added first to catch negative values before the size compare.
References
Impacted products
Vendor Product Version
Linux Linux Version: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7
Version: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7
Version: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7
Version: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7
Version: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7
Version: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7
Version: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7
Version: 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/llcp_sock.c"
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              "version": "0",
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: avoid userspace overflow on invalid optlen\n\nnfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so\nthe kernel always stores 4 bytes regardless of the caller-supplied\noptlen. The existing min_t(u32, len, sizeof(u32)) only clamps the length\nreported back to userspace; it does not constrain the store. A call with\noptlen \u003c 4 therefore writes past the user buffer, violating the\ngetsockopt(2) contract for all five supported optnames.\n\nReject any call with optlen \u003c sizeof(u32) up front. \u0027len\u0027 is int, so a\nplain size comparison would promote a negative optlen to size_t and slip\npast the check; an explicit \u0027len \u003c 0\u0027 test is added first to catch\nnegative values before the size compare."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:00:02.755Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/42859562b7cc4313a84a584f338118edb7087066"
        },
        {
          "url": "https://git.kernel.org/stable/c/598dcd53c52f8eeb9dd5382198c03960d5d40fcd"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e40f2f5e7bc06c3ddef781180ce4f7994176547"
        },
        {
          "url": "https://git.kernel.org/stable/c/35573c6cb081af2f4a7caeea291302aca5484526"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4c5abaea06292e1dddb70eac1b51589b32c77a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd6f1277b62bc1df348ca21739df2bc546fcd493"
        },
        {
          "url": "https://git.kernel.org/stable/c/99985bfa8336fadcc69190ba2dcbd5386af3d661"
        }
      ],
      "title": "nfc: llcp: avoid userspace overflow on invalid optlen",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90226",
    "datePublished": "2026-09-17T16:07:35.322Z",
    "dateReserved": "2026-09-11T19:38:34.794Z",
    "dateUpdated": "2026-10-19T09:00:02.755Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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