SB20260720345 - Integer overflow in Linux kernel thunderbolt driver

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260720345

SB20260720345 - Integer overflow in Linux kernel thunderbolt driver

Published: July 20, 2026

Security Bulletin ID SB20260720345
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Integer overflow (CVE-ID: CVE-2026-63893)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an integer overflow leading to an out-of-bounds read in tb_property_entry_valid() in the thunderbolt property parser when processing a crafted XDomain property block from a peer device. A remote attacker can send crafted property entries with wrapped value and length fields to disclose sensitive information.

For TEXT-typed entries using the "deviceid" or "vendorid" keys, leaked data may be exposed through the per-XDomain sysfs device_name or vendor_name attributes. The disclosed data is NUL-bounded and the attacker controls an offset rather than an absolute address.


Remediation

Install update from vendor's website.

References