CVE-2026-31629

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.

• CWE-667

• https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbfPatch
• https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82cPatch
• https://git.kernel.org/stable/c/665315df9c3486cb213fc44d83cc8bcd47fe0d26
• https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2Patch
• https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abfPatch
• https://git.kernel.org/stable/c/9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6
• https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6Patch
• https://git.kernel.org/stable/c/b2a23529593d011fb433a3d711fc597ed6a6bd2f
• https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9Patch

Published

Apr 24, 2026

Last Modified

Jun 17, 2026

Status

Modified

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