CVE-2026-64083
Description
A flaw was found in the Linux kernel's pmbus/adm1266 driver within the hwmon subsystem. The adm1266_gpio_get() and adm1266_gpio_get_multiple() functions fail to validate the length of responses from I2C block-read operations. A local user or a malicious I2C (Inter-Integrated Circuit) slave device can exploit this by providing a short block-read response. This vulnerability leads to the disclosure of small amounts of kernel stack memory, which can be accessed by userspace applications.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
If the uninitialized pointer is used in a read operation, an attacker might be able to read sensitive portions of memory.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the uninitialized pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the uninitialized pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
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