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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 affected < 93e01e837e105299f1c259ef71f6e1ec4fe806e3
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 affected < 11f83253244060b5de5eac787f61ae3f3e559d01
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 affected < fa9861e5c8af7651dddfa8d490aaada17ae33b6c
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 affected < 6ff2ebfef75fbc57d937d8fbe738b967edf2d331
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 affected < 1eeedb310229bfee9dd4d992e5bba33fe1378a8f
f5b8abf9fc3dacd7529d363e26fe8230935d65f8 affected < 2a14e91b6d76639dac70ea170f4384c1ee3cb48d
Linux Linux affected
Version Status Constraints
5.18 affected —
0 unaffected < 5.18
6.1.165 unaffected ≤ 6.1.*
6.6.128 unaffected ≤ 6.6.*
6.12.75 unaffected ≤ 6.12.*
6.18.14 unaffected ≤ 6.18.*
6.19.4 unaffected ≤ 6.19.*
7.0 unaffected ≤ *

No data.

No data.

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01 cve-icon cve-icon
https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f cve-icon cve-icon
https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d cve-icon cve-icon
https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331 cve-icon cve-icon
https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3 cve-icon cve-icon
https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c cve-icon cve-icon
History

Wed, 27 May 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-457

Wed, 27 May 2026 14:15:00 +0000

Type Values Removed Values 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.
Title mctp i2c: initialise event handler read bytes
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-05-27T12:15:45.082Z

Reserved: 2026-05-13T15:03:33.080Z

Link: CVE-2026-45865

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-27T14:16:58.787

Modified: 2026-05-27T14:48:31.480

Link: CVE-2026-45865

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-27T16:45:37Z

Weaknesses