SB20260905121 - Out-of-bounds read in Linux kernel nfc st21nfca driver

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260905121

SB20260905121 - Out-of-bounds read in Linux kernel nfc st21nfca driver

Published: September 5, 2026

Security Bulletin ID SB20260905121
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-80823)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose kernel memory or cause a denial of service.

The vulnerability exists due to an out-of-bounds read in the st21nfca_tm_recv_atr_req() and st21nfca_tm_send_atr_res() ATR_REQ handling path when handling ATR_REQ frames whose declared length exceeds the received frame length. A remote attacker can send a short ATR_REQ frame with an oversized declared length to disclose kernel memory or cause a denial of service.

Exploitation requires an RF peer.


Remediation

Install update from vendor's website.

References