CVE-2026-64083 Linux CVE debrief

Who should care

Linux kernel users, Linux distribution maintainers, and developers working with the hwmon pmbus/adm1266 component should be aware of this vulnerability and take necessary precautions. This vulnerability could allow an attacker to obtain sensitive information about the kernel stack, potentially leading to further exploitation. Affected operators, platforms, vulnerability-management teams, and security teams should review the official advisory and take necessary actions to mitigate this vulnerability.

Technical summary

In the Linux kernel, the hwmon pmbus/adm1266 component did not properly handle short block-read responses in the GPIO accessors. This could lead to a stack information leak, allowing an attacker to obtain sensitive information about the kernel stack. The vulnerability is due to the improper composition of the pin-status word in the adm1266_gpio_get() and adm1266_gpio_get_multiple() functions. The official patch updates the hwmon pmbus/adm1266 component to reject short block-read responses in the GPIO accessors.

Defensive priority

Medium

Recommended defensive actions

• Apply the official patch to update the hwmon pmbus/adm1266 component
• Use a Linux distribution that has already patched this vulnerability
• Monitor kernel logs for suspicious activity related to the hwmon pmbus/adm1266 component
• 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 2026-07-19T16:17:48.910Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the official advisory. The hwmon pmbus/adm1266 component in the Linux kernel is vulnerable to a stack information leak due to improper handling of short block-read responses in the GPIO accessors. This vulnerability could allow an attacker to obtain sensitive information about the kernel stack. The official CVE record and NVD detail page provide additional context, but no further details are available at this time.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.