SB2026040648 - Out-of-bounds read in Linux kernel bluetooth

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Main Vulnerability Database SB2026040648

SB2026040648 - Out-of-bounds read in Linux kernel bluetooth

Published: April 6, 2026

Security Bulletin ID SB2026040648
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-31393)

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

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


The vulnerability allows a remote attacker to disclose adjacent memory contents.

The vulnerability exists due to an out-of-bounds read in l2cap_information_rsp() when processing a truncated L2CAP_INFO_RSP packet with a successful result. A remote attacker can send a specially crafted Bluetooth L2CAP response to disclose adjacent memory contents.

The issue occurs because the code reads response payload data beyond the validated fixed header length for L2CAP_IT_FEAT_MASK and L2CAP_IT_FIXED_CHAN cases.


Remediation

Install update from vendor's website.

References