CVE-2026-45865 Details
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.
A vulnerability exists in the Linux kernel's I2C MCTP binding driver, specifically within the event handler for MCTP over I2C devices. The issue arises because the driver does not properly initialize the data read from the I2C bus, leading to the potential for reading uninitialized stack memory. This vulnerability has been observed in the I2C Aspeed and I2C NPCM7XX implementations. The problem was identified when testing the I2C transfer command, which revealed that the driver returned a value from the I2C bus that was not properly initialized. The vulnerability has been addressed by modifying the event handler to return a fixed value, ensuring that the read operation does not expose uninitialized data.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched version are available on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01 | kernel.org | Patch |
| https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f | kernel.org | Patch |
| https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d | kernel.org | Patch |
| https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331 | kernel.org | Patch |
| https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.18, < 6.1.165 >= 6.2, < 6.6.128 >= 6.7, < 6.12.75 >= 6.13, < 6.18.14 >= 6.19, < 6.19.4 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 25, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 27, 2026 | New CVE Received | kernel.org |