CVE-2022-48806 eeprom: ee1004: limit i2c reads to I2C_SMBUS_BLOCK_MAX

2024-07-1611:43:57

Linux

www.cve.org

linux kernel

vulnerability resolved

eeprom

ee1004

i2c reads

i2c_smbus_block_max

effa453168a7

i2c_smbus_read_i2c_block_data_or_emulated

fix

maximum length

EPSS

Percentile

16.0%

JSON

In the Linux kernel, the following vulnerability has been resolved:

eeprom: ee1004: limit i2c reads to I2C_SMBUS_BLOCK_MAX

Commit effa453168a7 (“i2c: i801: Don’t silently correct invalid transfer
size”) revealed that ee1004_eeprom_read() did not properly limit how
many bytes to read at once.

In particular, i2c_smbus_read_i2c_block_data_or_emulated() takes the
length to read as an u8. If count == 256 after taking into account the
offset and page boundary, the cast to u8 overflows. And this is common
when user space tries to read the entire EEPROM at once.

To fix it, limit each read to I2C_SMBUS_BLOCK_MAX (32) bytes, already
the maximum length i2c_smbus_read_i2c_block_data_or_emulated() allows.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/misc/eeprom/ee1004.c"
    ],
    "versions": [
      {
        "version": "aca56c298e2a",
        "lessThan": "3937c35493ee",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "25714ad6bf5e",
        "lessThan": "a37960df7eac",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "be9313f755a7",
        "lessThan": "9a5f471ae380",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "07d9beb6e3c2",
        "lessThan": "9443ddeb3754",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "effa453168a7",
        "lessThan": "c0689e46be23",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/misc/eeprom/ee1004.c"
    ],
    "versions": [
      {
        "version": "5.4.174",
        "lessThan": "5.4.180",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "5.10.94",
        "lessThan": "5.10.101",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "5.15.17",
        "lessThan": "5.15.24",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "5.16.3",
        "lessThan": "5.16.10",
        "status": "affected",
        "versionType": "custom"
      }
    ]
  }
]