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CVE-2026-45865

5.5 · MEDIUM

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.

Published May 27, 2026EPSS 0.16%

Overview

CVE-2026-45865 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01Refgit.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8fRefgit.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48dRefgit.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331Refgit.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3Refgit.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45865?

CVE-2026-45865 is a medium-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-45865?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-45865?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-45865?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45865 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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