SB20260720139 - Out-of-bounds write in Linux kernel hwmon pmbus driver

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Main Vulnerability Database SB20260720139

SB20260720139 - Out-of-bounds write in Linux kernel hwmon pmbus driver

Published: July 20, 2026

Security Bulletin ID SB20260720139
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

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-2026-64084)

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

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to disclose sensitive information and corrupt memory.

The vulnerability exists due to an out-of-bounds read and out-of-bounds write in adm1266_gpio_get_multiple() in the adm1266 PMBus driver when iterating a caller-supplied gpio mask. A local user can trigger access to bits beyond the end of the supplied mask and bits arrays to disclose sensitive information and corrupt memory.

The iteration uses a PMBus command value as the scan bound instead of the number of PDIO pins.


Remediation

Install update from vendor's website.

References