CVE-2026-31629

Advisory lineage Upstream: 0 Downstream: 7
Modified
Published: 24 Apr 2026, 14:42
Last modified:14 Jun 2026, 17:43

Vulnerability Summary

Overall Risk (default)
medium
35/100
CVSS Score
8.8 HIGH
v3.1 (cve.org)
EPSS Score
0.22% LOW
0% probability +0.17%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

24 Apr 2026, 14:42
Published
Vulnerability first disclosed
14 Jun 2026, 17:43
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•HIGH•Score: 8.8CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.22%• Percentile: 13%

Techniques & Countermeasures

  • CWE-667•Improper Locking

    The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

Affected Systems

  • linux•linux

    ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 796e0cac058252d0ad34ebe288e6f7979b5fc9b2 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 8977fad2b3c6eefd414131168d597c5d1d5e1abf | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ff3d9e8f7244293e303f7b6ef70774291c7c27e9 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < aba4712e8f0381cd5d196534ce2ad082626a5ab6 | ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < b2a23529593d011fb433a3d711fc597ed6a6bd2f | ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < 665315df9c3486cb213fc44d83cc8bcd47fe0d26 | ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < 9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6 | ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < 0eb1263a3b8c36418c9ba295c9ab3abed664edbf | ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < 796e0cac058252d0ad34ebe288e6f7979b5fc9b2 | ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < 8977fad2b3c6eefd414131168d597c5d1d5e1abf | ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < ff3d9e8f7244293e303f7b6ef70774291c7c27e9 | ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < aba4712e8f0381cd5d196534ce2ad082626a5ab6 | ≥ d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < 2b5dd4632966c39da6ba74dbc8689b309065e82c | 3.3

  • linux•linux_kernel

    ≥ 3.3, < 6.6.136 | ≥ 6.7, < 6.12.83 | ≥ 6.13, < 6.18.24 | ≥ 6.19, < 6.19.14 | ≥ 7.0, < 7.0.1

References (9)