Answer in brief
CVE-2026-31629 records a High severity (CVSS 8.8) vulnerability in nfc: llcp: add missing return after LLCP_CLOSED checks. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d646960f7986fefb460a2b062d5ccc8ccfeacc3a <b2a23529593d011fb433a3d711fc597ed6a6bd2f || >=d646960f7986fefb460a2b062d5ccc8ccfeacc3a <665315df9c3486cb213fc44d83cc8bcd47fe0d26 || >=d646960f7986fefb460a2b062d5ccc8ccfeacc3a <9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6 || >=d646960f7986fefb460a2b062d5ccc8ccfeacc3a <0eb1263a3b8c36418c9ba295c9ab3abed664edbf || >=d646960f7986fefb460a2b062d5ccc8ccfeacc3a <796e0cac058252d0ad34ebe288e6f7979b5fc9b2 || >=d646960f7986fefb460a2b062d5ccc8ccfeacc3a <8977fad2b3c6eefd414131168d597c5d1d5e1abf || >=d646960f7986fefb460a2b062d5ccc8ccfeacc3a <ff3d9e8f7244293e303f7b6ef70774291c7c27e9 || >=d646960f7986fefb460a2b062d5ccc8ccfeacc3a <aba4712e8f0381cd5d196534ce2ad082626a5ab6 || >=d646960f7986fefb460a2b062d5ccc8ccfeacc3a <2b5dd4632966c39da6ba74dbc8689b309065e82c | b2a23529593d011fb433a3d711fc597ed6a6bd2f, 665315df9c3486cb213fc44d83cc8bcd47fe0d26, 9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6, 0eb1263a3b8c36418c9ba295c9ab3abed664edbf, 796e0cac058252d0ad34ebe288e6f7979b5fc9b2, 8977fad2b3c6eefd414131168d597c5d1d5e1abf, ff3d9e8f7244293e303f7b6ef70774291c7c27e9, aba4712e8f0381cd5d196534ce2ad082626a5ab6, 2b5dd4632966c39da6ba74dbc8689b309065e82c |
| Linux/Linuxgeneric | 3.3 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.