CVE-2026-45865

mctp i2c: initialise event handler read bytes

State: Published
Severity: Not scored
Published: May 27, 2026
Updated: May 27, 2026
Reserved: May 13, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before 93e01e837e105299f1c259ef71f6e1ec4fe806e3Affected f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before 11f83253244060b5de5eac787f61ae3f3e559d01Affected f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before fa9861e5c8af7651dddfa8d490aaada17ae33b6cAffected f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before 6ff2ebfef75fbc57d937d8fbe738b967edf2d331Affected f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before 1eeedb310229bfee9dd4d992e5bba33fe1378a8fAffected f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before 2a14e91b6d76639dac70ea170f4384c1ee3cb48dAffected
LinuxLinux	5.18Affected before 5.18Not affected 6.1.165 through 6.1.Not affected 6.6.128 through 6.6.Not affected 6.12.75 through 6.12.Not affected 6.18.14 through 6.18.Not affected 6.19.4 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before 93e01e837e105299f1c259ef71f6e1ec4fe806e3Affected
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before 11f83253244060b5de5eac787f61ae3f3e559d01Affected
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before fa9861e5c8af7651dddfa8d490aaada17ae33b6cAffected
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before 6ff2ebfef75fbc57d937d8fbe738b967edf2d331Affected
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before 1eeedb310229bfee9dd4d992e5bba33fe1378a8fAffected
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 to before 2a14e91b6d76639dac70ea170f4384c1ee3cb48dAffected

LinuxLinux

5.18Affected
before 5.18Not affected
6.1.165 through 6.1.*Not affected
6.6.128 through 6.6.*Not affected
6.12.75 through 6.12.*Not affected
6.18.14 through 6.18.*Not affected
6.19.4 through 6.19.*Not affected
7.0 and laterNot affected

References

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