CVE-2026-45865
mctp i2c: initialise event handler read bytes
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.
INFO
Published Date :
May 27, 2026, 2:16 p.m.
Last Modified :
May 27, 2026, 2:48 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the Linux kernel patch for mctp i2c event handler.
- Ensure i2c read values are initialized to 0xff.
- Test i2c transfer to confirm correct 0xff return values.
References to Advisories, Solutions, and Tools
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CVE-2026-45865.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-45865 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-45865
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following table lists the changes that have been made to the
CVE-2026-45865 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 27, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01 Added Reference https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f Added Reference https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d Added Reference https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331 Added Reference https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3 Added Reference https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c