CVE-2026-43141
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ntb_hw_switchtec shift-out-of-bounds in Linux kernel

Publication date: 2026-05-06

Last updated on: 2026-05-06

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ntb: ntb_hw_switchtec: Fix shift-out-of-bounds for 0 mw lut Number of MW LUTs depends on NTB configuration and can be set to zero, in such scenario rounddown_pow_of_two will cause undefined behaviour and should not be performed. This patch ensures that rounddown_pow_of_two is called on valid value.
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Meta Information
Published
2026-05-06
Last Modified
2026-05-06
Generated
2026-06-16
AI Q&A
2026-05-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-43141
EUVD
EUVD-2026-27702
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's ntb_hw_switchtec component. It involves a shift-out-of-bounds error related to the number of Memory Window (MW) Look-Up Tables (LUTs). When the number of MW LUTs is set to zero, the function rounddown_pow_of_two is called with an invalid value, causing undefined behavior. The patch fixes this by ensuring rounddown_pow_of_two is only called with valid values.

Impact Analysis

The vulnerability can cause undefined behavior in the Linux kernel when the number of MW LUTs is zero, potentially leading to system instability or crashes. This could affect systems using the ntb_hw_switchtec component, possibly resulting in denial of service or other unpredictable kernel behavior.

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