CVE-2026-45865
Published May 27, 2026
Modified May 27, 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.
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EPSS — Exploit Prediction
0.0021
Probability of exploitation
0.11%
Percentile rank
EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.
References
Other References
https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01
https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f
https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d
https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331
https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3
https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c
Frequently Asked Questions
What is CVE-2026-45865? +
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.
How do I check if I'm vulnerable to CVE-2026-45865? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.