SB2026080621 - Integer underflow in Linux kernel bluetooth driver

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Main Vulnerability Database SB2026080621

SB2026080621 - Integer underflow in Linux kernel bluetooth driver

Published: August 6, 2026

Security Bulletin ID SB2026080621
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) Integer underflow (CVE-ID: CVE-2026-64573)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/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.

The vulnerability exists due to an out-of-bounds read and out-of-bounds write in the qca_tlv_check_data() TLV parser when parsing a crafted firmware TLV with an undersized NVM tag length. A local user can supply a specially crafted firmware image to trigger out-of-bounds access and cause a denial of service.

The issue is caused by an integer underflow in the loop bound calculation for TLV_TYPE_NVM records.


Remediation

Install update from vendor's website.

References