SB20261022158 - Improper locking in Linux kernel nfc

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Main Vulnerability Database SB20261022158

SB20261022158 - Improper locking in Linux kernel nfc

Published: October 22, 2026

Security Bulletin ID SB20261022158
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper locking (CVE-ID: CVE-2026-98581)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service by exhausting kernel memory through unbounded socket leaks.

The vulnerability exists due to improper locking and inconsistent socket list membership in the Linux kernel NFC LLCP nfc_llcp_recv_dm() function when handling DM(NOBOUND) or DM(REJ) messages. A local user can race socket release against concurrent connection operations while a remote peer supplies these messages over an established LLCP link to corrupt the connecting socket list, disrupt reference counting, and leak kernel sockets until memory is exhausted.


Remediation

Install update from vendor's website.

References