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nfc: llcp: add missing return after LLCP_CLOSED checks

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: add missing return after LLCP_CLOSED checks In nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc(), when the socket state is LLCP_CLOSED, the code correctly calls release_sock() and nfc_llcp_sock_put() but fails to return. Execution falls through to the remainder of the function, which calls release_sock() and nfc_llcp_sock_put() again. This results in a double release_sock() and a refcount underflow via double nfc_llcp_sock_put(), leading to a use-after-free. Add the missing return statements after the LLCP_CLOSED branches in both functions to prevent the fall-through.

Announced Source revision 1
Original source ↗

CVE-2026-31629

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-2026-31629

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": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "b2a23529593d011fb433a3d711fc597ed6a6bd2f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "665315df9c3486cb213fc44d83cc8bcd47fe0d26",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "0eb1263a3b8c36418c9ba295c9ab3abed664edbf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "796e0cac058252d0ad34ebe288e6f7979b5fc9b2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "8977fad2b3c6eefd414131168d597c5d1d5e1abf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "ff3d9e8f7244293e303f7b6ef70774291c7c27e9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "aba4712e8f0381cd5d196534ce2ad082626a5ab6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a",
        "lessThan": "2b5dd4632966c39da6ba74dbc8689b309065e82c",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/nfc/llcp_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.136",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.83",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.1",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/nfc/llcp_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31629

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#28304 · Revision 1
Added to Heist Feed
Publisher date
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