Description

In the Linux kernel, the following vulnerability has been resolved: mctp i2c: initialise event handler read bytes Set a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads will return "val" from the i2c bus driver. For i2c-aspeed and i2c-npcm7xx that is a stack uninitialised u8. Tested with "i2ctransfer -y 1 r10@0x34" where 0x34 is a mctp-i2c instance, now it returns all 0xff.

References 6

• git.kernel.org https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01
• git.kernel.org https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f
• git.kernel.org https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d
• git.kernel.org https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331
• git.kernel.org https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3
• git.kernel.org https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c

Remediation