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.

The following products are affected by CVE-2026-31629 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-31629.

URL	Resource
https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf
https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c
https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2
https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf
https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6
https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9
https://lore.kernel.org/linux-cve-announce/2026042428-CVE-2026-31629-84ab@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-31629
https://www.cve.org/CVERecord?id=CVE-2026-31629