CVE-2026-64084 Linux CVE debrief

Who should care

Linux kernel users and administrators, particularly those using the hwmon: (pmbus/adm1266) module, should be aware of this vulnerability and take steps to ensure their systems are updated. The vulnerability has a medium defensive priority, and users should review their systems and ensure they are updated.

Technical summary

The vulnerability was caused by an incorrect upper bound in the adm1266_gpio_get_multiple() function. The function iterates over the PDIO portion of the caller-supplied mask using a for loop that incorrectly used ADM1266_PDIO_STATUS (0xE9) instead of ADM1266_PDIO_NR. This led to out-of-bounds reads and writes. The issue has been resolved by substituting ADM1266_PDIO_NR for the constant. The vulnerability affects the hwmon: (pmbus/adm1266) module in the Linux kernel.

Defensive priority

Medium

Recommended defensive actions

• Update the Linux kernel to the latest version
• Verify that the hwmon: (pmbus/adm1266) module is updated
• Monitor system logs for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-19T16:17:49.043Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about this vulnerability, and further verification is needed to understand its impact. Linux kernel users and administrators should review their systems and ensure they are updated. The CVE record does not provide specific details about the vulnerability, so defenders should verify the hwmon: (pmbus/adm1266) module and its configuration.

Official resources