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.

CVSS 3.1

8.8CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.3% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-25)

CWE

CWE-667

Published

2026-04-24

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf
• https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c
• https://git.kernel.org/stable/c/665315df9c3486cb213fc44d83cc8bcd47fe0d26
• https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2
• https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf

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