CVE intelligence

CVE-2026-31629

Vulnerability intelligence

Published Apr 24, 2026Sources checked Nov 12, 2026

8.8HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-31629 and is rated High severity with a CVSS score of 8.8. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: May 1, 2026

CBL-Mariner Releases

Vendor-listed releases

6.6.137.1-1

CISA KEVNot listedBased on the latest collected catalog

EPSS0.3%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-31629?

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.

Source: NVD