SB20260720290 - Use of Uninitialized Variable in Linux kernel iio adc driver
Published: July 20, 2026
Security Bulletin ID
SB20260720290
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use of Uninitialized Variable (CVE-ID: CVE-2026-63936)
CWE-ID: CWE-457 - Use of Uninitialized Variable
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to use of uninitialized memory in mt6358_read_imp() in the mt6359 auxadc driver when handling a failed regmap read during impedance measurement. A local user can trigger the affected measurement path to disclose sensitive information.
Stack memory contents may be reported as a measurement result if the bus read fails.
Remediation
Install update from vendor's website.