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

概要

eeprom: ee1004: limit i2c reads to I2C_SMBUS_BLOCK_MAX

原文の説明

取得元が公開している説明をそのまま載せています (多くは英語)。

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.

出典: OSV.dev (Open Source Vulnerabilities) NVD OSV

影響パッケージ

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"5.4.174"},{"fixed":"5.4.180"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.10.94"},{"fixed":"5.10.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.15.17"},{"fixed":"5.15.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.3"},{"fixed":"5.16.10"}]}]

ディストリビューション別の修正状況

各ディストリビューションが公開している、この CVE の修正パッケージ

Debian DEBIAN-CVE-2022-48806 linux 修正版: 5.10.103-1
Ubuntu UBUNTU-CVE-2022-48806 linux-azure

概要

原文の説明

影響パッケージ

ディストリビューション別の修正状況

参照URL