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.

CVSS Scores

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Meta Information

Published

2026-05-06

Last Modified

2026-05-08

Generated

2026-07-06

AI Q&A

2026-05-06

EPSS Evaluated

2026-07-05

NVD

CVE-2026-43172

EUVD

EUVD-2026-27735

Affected Vendors & Products

Vendor	Product	Version / Range
intel	iwlwifi	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

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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