CVE-2026-45865

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf5b8abf9fc3dacd7529d363e26fe8230935d65f8 < 93e01e837e105299f1c259ef71f6e1ec4fe806e3affected
LinuxLinuxf5b8abf9fc3dacd7529d363e26fe8230935d65f8 < 11f83253244060b5de5eac787f61ae3f3e559d01affected
LinuxLinuxf5b8abf9fc3dacd7529d363e26fe8230935d65f8 < fa9861e5c8af7651dddfa8d490aaada17ae33b6caffected
LinuxLinuxf5b8abf9fc3dacd7529d363e26fe8230935d65f8 < 6ff2ebfef75fbc57d937d8fbe738b967edf2d331affected
LinuxLinuxf5b8abf9fc3dacd7529d363e26fe8230935d65f8 < 1eeedb310229bfee9dd4d992e5bba33fe1378a8faffected
LinuxLinuxf5b8abf9fc3dacd7529d363e26fe8230935d65f8 < 2a14e91b6d76639dac70ea170f4384c1ee3cb48daffected
LinuxLinux5.18affected
LinuxLinux0 < 5.18unaffected
LinuxLinux6.1.165 <= 6.1.*unaffected
LinuxLinux6.6.128 <= 6.6.*unaffected
LinuxLinux6.12.75 <= 6.12.*unaffected
LinuxLinux6.18.14 <= 6.18.*unaffected
LinuxLinux6.19.4 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References