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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-64083

hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 pins_status = read_buf[0] + (read_buf[1] << 8); 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). 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • d98dfad35c38c037b37c4adc99df01da571031a5 to < fd9196aad9e5a3845cea17de3405ebc700382142affected
  • d98dfad35c38c037b37c4adc99df01da571031a5 to < ee4799becf7d2af3778007e22c2e55c4009a49c7affected
  • d98dfad35c38c037b37c4adc99df01da571031a5 to < c603b6c6840ac0c6285f5eefea0de6242710af21affected
  • d98dfad35c38c037b37c4adc99df01da571031a5 to < a2d1c819348b36fccbbfcf37c5fa7a50a9b4528faffected
  • d98dfad35c38c037b37c4adc99df01da571031a5 to < ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946affected
  • d98dfad35c38c037b37c4adc99df01da571031a5 to < eb3cd9bb590460c6127145cb245be925d23f5232affected
  • d98dfad35c38c037b37c4adc99df01da571031a5 to < 64fa9328948ddcc0f7f3c23ea1756c126d9dffacaffected
  • d98dfad35c38c037b37c4adc99df01da571031a5 to < a7232f68c43ca62f545049b7f5fbfc75137b843baffected

Linux Linux

Default version status: affected

  • 5.10affected
  • 0 to < 5.10unaffected
  • 5.10.258 to ≤ 5.10.*unaffected
  • 5.15.209 to ≤ 5.15.*unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.142 to ≤ 6.6.*unaffected
  • 6.12.92 to ≤ 6.12.*unaffected
  • 6.18.34 to ≤ 6.18.*unaffected
  • 7.0.11 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References