CVE-2026-31629

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

24/04/2026

Last modified:

27/04/2026

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.

Impact

Vector 3.x

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

8.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	3.3 (including)	6.6.136 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.7 (including)	6.12.83 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.13 (including)	6.18.24 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.19 (including)	6.19.14 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	7.0 (including)	7.0.1 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-31629

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools