FKIE_CVE-2026-31629

Vulnerability from fkie_nvd - Published: 2026-04-24 15:16 - Updated: 2026-04-24 17:51
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: llcp: add missing return after LLCP_CLOSED checks\n\nIn nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc(), when the socket\nstate is LLCP_CLOSED, the code correctly calls release_sock() and\nnfc_llcp_sock_put() but fails to return. Execution falls through to\nthe remainder of the function, which calls release_sock() and\nnfc_llcp_sock_put() again. This results in a double release_sock()\nand a refcount underflow via double nfc_llcp_sock_put(), leading to\na use-after-free.\n\nAdd the missing return statements after the LLCP_CLOSED branches\nin both functions to prevent the fall-through."
    }
  ],
  "id": "CVE-2026-31629",
  "lastModified": "2026-04-24T17:51:40.810",
  "metrics": {},
  "published": "2026-04-24T15:16:42.217",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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