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Vulnerability record · CVE-2026-31629 · published 24 April 2026

CVE-2026-31629: Linux kernel vulnerability

Linux · Linux Kernel

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.

8.8 CVSS 3.1 High EPSS 0.35% · top 73.8% CWE-667 · CWE-667
8.8CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
17 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf Patch
https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c Patch
https://git.kernel.org/stable/c/665315df9c3486cb213fc44d83cc8bcd47fe0d26
https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2 Patch
https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf Patch
https://git.kernel.org/stable/c/9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6
https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6 Patch
https://git.kernel.org/stable/c/b2a23529593d011fb433a3d711fc597ed6a6bd2f
https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31629), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.