SB2026032550 - Out-of-bounds write in Linux kernel bluetooth

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Main Vulnerability Database SB2026032550

SB2026032550 - Out-of-bounds write in Linux kernel bluetooth

Published: March 25, 2026

Security Bulletin ID SB2026032550
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-23395)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in the Bluetooth L2CAP component when handling L2CAP_ECRED_CONN_REQ packets. A remote attacker can send a specially crafted sequence of L2CAP connection requests with the same command identifier to cause an overflow in channel allocation, leading to a denial of service.

Exploitation requires proximity to initiate a Bluetooth connection. The issue arises from failure to check for duplicate command identifiers during Enhanced Credit Control connection setup.


Remediation

Install update from vendor's website.

References