Skip to content
Heist/ feed
Unrated

nfc: llcp: avoid userspace overflow on invalid optlen

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-90226

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90226

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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",
        "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7",
        "lessThan": "bd6f1277b62bc1df348ca21739df2bc546fcd493",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "26fd76cab2e61cedc5c25f7151fb31b57ddc53c7",
        "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",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/nfc/llcp_sock.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90226

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36597 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement