Description
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.
Affected products
linux: linux kernel
References8
- git.kernel.org/stable/c/17cee2f59029039416e8f6303050038eb59ba149 Patch
- git.kernel.org/stable/c/299efd14c2eda7e5fd40025e54addd4151a01081 Patch
- git.kernel.org/stable/c/2aef8f08c479f4cbc83e1e6b19d1c94d4dd24f17 Patch
- git.kernel.org/stable/c/4d1da9a6be5a8156c532d571c2ed237169f99244 Patch
- git.kernel.org/stable/c/b96c7f0bc0713dc6403912f6527d4ff9168d6fe6 Patch
- git.kernel.org/stable/c/d0593e15fdeb56048a72c5c6e720f702759d0ccd Patch
- git.kernel.org/stable/c/d7834d92251baade796812876e95555e2066fa9f Patch
- git.kernel.org/stable/c/fa7ca363069a70b0d1aa51e8892e3095fe2ac1ec Patch
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 14 November 2026
- CWE
- CWE-787
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