High 8.8Published Apr 24, 2026

CVE-2026-31629nfc: llcp: add missing return after LLCP_CLOSED checks

Updated under an hour ago (Oct 28, 2026, 11:23 AM ET)

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It affects Linux and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from d646960f7986fefb460a2b062d5ccc8ccfeacc3a before b2a23529593d011fb433a3d711fc597ed6a6bd2f; from d646960f7986fefb460a2b062d5ccc8ccfeacc3a before 665315df9c3486cb213fc44d83cc8bcd47fe0d26; from d646960f7986fefb460a2b062d5ccc8ccfeacc3a before 9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6; from d646960f7986fefb460a2b062d5ccc8ccfeacc3a before 0eb1263a3b8c36418c9ba295c9ab3abed664edbf; from d646960f7986fefb460a2b062d5ccc8ccfeacc3a before 796e0cac058252d0ad34ebe288e6f7979b5fc9b2; from d646960f7986fefb460a2b062d5ccc8ccfeacc3a before 8977fad2b3c6eefd414131168d597c5d1d5e1abf; from d646960f7986fefb460a2b062d5ccc8ccfeacc3a before ff3d9e8f7244293e303f7b6ef70774291c7c27e9; from d646960f7986fefb460a2b062d5ccc8ccfeacc3a before aba4712e8f0381cd5d196534ce2ad082626a5ab6; and 1 more ranges	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	from 3.3 before 6.6.136; from 6.7 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; from 7.0 before 7.0.1	NVD

References

References

https://git.kernel.org/stable/c/b2a23529593d011fb433a3d711fc597ed6a6bd2f
https://git.kernel.org/stable/c/665315df9c3486cb213fc44d83cc8bcd47fe0d26
https://git.kernel.org/stable/c/9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6
https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf	patch
https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2	patch
https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf	patch
https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9	patch
https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6	patch
https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c	patch
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.