CVE-2026-43172
Undergoing Analysis Undergoing Analysis - In Progress
iwlwifi SMEM Parsing Array Overrun in Linux Kernel

Publication date: 2026-05-06

Last updated on: 2026-05-08

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: fix 22000 series SMEM parsing If the firmware were to report three LMACs (which doesn't exist in hardware) then using "fwrt->smem_cfg.lmac[2]" is an overrun of the array. Reject such and use IWL_FW_CHECK instead of WARN_ON in this function.
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Meta Information
Published
2026-05-06
Last Modified
2026-05-08
Generated
2026-06-16
AI Q&A
2026-05-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-43172
EUVD
EUVD-2026-27735
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
intel iwlwifi *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's iwlwifi driver for Intel wireless devices. It occurs when the firmware incorrectly reports three LMACs (Low MACs), which do not exist in the hardware. The driver then attempts to access an array element that is out of bounds (specifically fwrt->smem_cfg.lmac[2]), causing an array overrun. The fix involves rejecting such incorrect firmware reports and replacing a warning mechanism (WARN_ON) with a more appropriate check (IWL_FW_CHECK) to handle this condition safely.

Impact Analysis

An array overrun in the kernel driver can lead to undefined behavior, including potential system crashes, instability, or security issues such as memory corruption. If exploited, it could allow attackers to cause denial of service or possibly execute arbitrary code with kernel privileges, depending on the context and further exploitation.

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