CVE-2026-64083
Status: AnalyzedMedium (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors
adm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the pin-status word as
right after i2c_smbus_read_block_data(), guarding only against an error return. A well-behaved device returns 2 bytes for GPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or 1-byte response too. If the device returns 0 bytes, both read_buf slots are uninitialized stack memory; if it returns 1 byte, read_buf[1] is.
The composed value then flows through set_bit() into the caller's *bits in adm1266_gpio_get_multiple(), or into the return value of adm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and the char-dev ioctls).
Read full descriptionShow less
That leaks a few bits of kernel stack per request on any device whose firmware glitch, bus error, or hostile slave produces a short block-read response.
Add the missing length check to both call sites and surface a short response as -EIO.
Technical details traces, logs and code from the original report
pins_status = read_buf[0] + (read_buf[1] << 8);
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Base score: 5.5
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.16%
- Percentile among all scored CVEs: 5
- Score date: 10/5/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
CWEs
- NVD-CWE-noinfo
References
- https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac
- https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f
- https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b
- https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946
- https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21
- https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232
- https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7
- https://git.kernel.org/stable/c/fd9196aad9e5a3845cea17de3405ebc700382142
Raw JSON (NVD)
Show
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors\n\nadm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the\npin-status word as\n\n\tpins_status = read_buf[0] + (read_buf[1] << 8);\n\nright after i2c_smbus_read_block_data(), guarding only against an\nerror return. A well-behaved device returns 2 bytes for\nGPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or\n1-byte response too. If the device returns 0 bytes, both read_buf\nslots are uninitialized stack memory; if it returns 1 byte, read_buf[1]\nis.\n\nThe composed value then flows through set_bit() into the caller's\n*bits in adm1266_gpio_get_multiple(), or into the return value of\nadm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and\nthe char-dev ioctls). That leaks a few bits of kernel stack per\nrequest on any device whose firmware glitch, bus error, or hostile\nslave produces a short block-read response.\n\nAdd the missing length check to both call sites and surface a short\nresponse as -EIO."
}
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