CVE-2026-31629nfc: llcp: add missing return after LLCP_CLOSED checks
Updated under an hour ago ()
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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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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 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
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
- 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/0eb1263a3b8c36418c9ba295c9ab3abed664edbfpatch
- https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2patch
- https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abfpatch
- https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9patch
- https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6patch
- https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82cpatch
- 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.