CVE-2026-43457
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Memory Leak in Linux Kernel MCTP I2C Driver

Publication date: 2026-05-08

Last updated on: 2026-05-21

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mctp: i2c: fix skb memory leak in receive path When 'midev->allow_rx' is false, the newly allocated skb isn't consumed by netif_rx(), it needs to free the skb directly.
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Meta Information
Published
2026-05-08
Last Modified
2026-05-21
Generated
2026-06-19
AI Q&A
2026-05-08
EPSS Evaluated
2026-06-18
NVD
CVE-2026-43457
EUVD
EUVD-2026-28763
Affected Vendors & Products
Showing 8 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 6.2 (inc) to 6.6.130 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.19 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.78 (exc)
linux linux_kernel From 6.19 (inc) to 6.19.9 (exc)
linux linux_kernel From 5.18 (inc) to 6.1.167 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-401 The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.
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Executive Summary

This vulnerability is related to the Linux kernel's mctp i2c component. Specifically, when the 'midev->allow_rx' flag is false, a newly allocated socket buffer (skb) is not properly handled by the network receive function (netif_rx()). Instead of being consumed, the skb needs to be freed directly to avoid a memory leak.

Impact Analysis

The impact of this vulnerability is a memory leak in the Linux kernel's network receive path for the mctp i2c component. Over time, this could lead to increased memory usage and potentially degrade system performance or stability if the leaked memory accumulates.

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