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CVE-2026-90226

Estado: RecibidaSin puntuar—

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.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-90226",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7",
              "lessThan": "42859562b7cc4313a84a584f338118edb7087066",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7",
              "lessThan": "598dcd53c52f8eeb9dd5382198c03960d5d40fcd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7",
              "lessThan": "7e40f2f5e7bc06c3ddef781180ce4f7994176547",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7",
              "lessThan": "35573c6cb081af2f4a7caeea291302aca5484526",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7",
              "lessThan": "b4c5abaea06292e1dddb70eac1b51589b32c77a3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7",
              "lessThan": "8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "99985bfa8336fadcc69190ba2dcbd5386af3d661",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/nfc/llcp_sock.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.10"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.10",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/nfc/llcp_sock.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:18.270",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/35573c6cb081af2f4a7caeea291302aca5484526",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/42859562b7cc4313a84a584f338118edb7087066",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/598dcd53c52f8eeb9dd5382198c03960d5d40fcd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7e40f2f5e7bc06c3ddef781180ce4f7994176547",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/99985bfa8336fadcc69190ba2dcbd5386af3d661",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b4c5abaea06292e1dddb70eac1b51589b32c77a3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bd6f1277b62bc1df348ca21739df2bc546fcd493",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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 < 4 therefore writes past the user buffer, violating the\ngetsockopt(2) contract for all five supported optnames.\n\nReject any call with optlen < sizeof(u32) up front. 'len' is int, so a\nplain size comparison would promote a negative optlen to size_t and slip\npast the check; an explicit 'len < 0' test is added first to catch\nnegative values before the size compare."
    }
  ],
  "lastModified": "2026-09-17T17:17:18.270",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}