CVE-2026-64084
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel hwmon (pmbus/adm1266) driver, a vulnerability was found where the wrong constant (ADM1266_PDIO_STATUS instead of ADM1266_PDIO_NR) is used in the PDIO mask scanning loop. This causes out-of-bounds read from the caller's stack and potential out-of-bounds write to the bits array, leading to memory corruption.
Risk Assessment
The organization risks system crashes, data leaks, or privilege escalation due to uncontrolled out-of-bounds memory access by the GPIO driver in the ADM1266 chip.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit replacing ADM1266_PDIO_STATUS with ADM1266_PDIO_NR). Check your distribution for the patch and apply it as a priority.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR adm1266_gpio_get_multiple() iterates the PDIO portion of the caller-supplied mask using for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) { ... } where ADM1266_PDIO_STATUS is the PMBus command code (0xE9, i.e. 233), not the number of PDIO pins. The intended upper bound is ADM1266_GPIO_NR + ADM1266_PDIO_NR = 25. gpiolib hands in a mask sized for gc.ngpio (= 25 bits on this chip), so the iteration walks find_next_bit() up to 242, reading up to 217 extra bits (a handful of unsigned-long words: four on 64-bit, seven on 32-bit) of whatever lives past the end of the mask in the caller's stack. Any incidental set bit in that range then drives a set_bit(gpio_nr, bits) call that writes past the end of the caller-supplied bits array too -- both out-of-bounds. Substitute ADM1266_PDIO_NR for the constant so the scan stops at the last real PDIO bit.