CVE-2026-90226

Full vulnerability record from the local CVENow database.

Description

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.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-17 17:17:18.270000

Last modified

2026-10-19 09:19:12.920000

View original CVE JSON

{
  "id": "CVE-2026-90226",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:18.270",
  "lastModified": "2026-10-19T09:19:12.920",
  "vulnStatus": "Received",
  "cveTags": [],
  "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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/nfc/llcp_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "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"
            },
            {
              "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7",
              "lessThan": "bd6f1277b62bc1df348ca21739df2bc546fcd493",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7",
              "lessThan": "99985bfa8336fadcc69190ba2dcbd5386af3d661",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/nfc/llcp_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "3.10",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "3.10",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.270",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.221",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.188",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.110",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "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"
    }
  ]
}