PT-2026-43732 · Linux · Linux

Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-45865

Mitre

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.

Related Identifiers

CVE-2026-45865

Affected Products

Linux

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-45865 · Security Note
• https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01 · Note
• https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c · Note
• https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d · Note
• https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3 · Note
• https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f · Note
• https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331 · Note