SB2026102226 - Out-of-bounds write in Linux kernel bluetooth

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026102226

SB2026102226 - Out-of-bounds write in Linux kernel bluetooth

Published: October 22, 2026

Security Bulletin ID SB2026102226
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) Out-of-bounds write (CVE-ID: CVE-2026-98456)

CWE-ID: CWE-787 - Out-of-bounds write

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 corrupt kernel memory, potentially causing a denial of service.

The vulnerability exists due to a race condition leading to an out-of-bounds write in the Bluetooth management function read_unconf_index_list() when controller flags change between counting eligible controllers and filling the response. A local user can request the unconfigured controller index list during asynchronous controller setup to trigger a write beyond the allocated response buffer, potentially crashing the kernel.


Remediation

Install update from vendor's website.

References