CVE-2026-93806

Received Received - Intake

Buffer Overflow in Linux Kernel WiFi Configuration

Publication date: 2026-09-24

Last updated on: 2026-10-03

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: validate assoc response length before status and IE access cfg80211_rx_assoc_resp() initialises the status and response-IE fields of cfg80211_connect_resp_params from the management frame before proving that the frame is long enough for those offsets. S1G and regular association responses also have different IE offsets, but the S1G path only patched resp_ie after the unsafe initialiser had already run. Defer resp_ie, resp_ie_len, and status to after the link-iteration loop. Use a bool to remember whether the frame is S1G, then validate the appropriate minimum length and set all three fields in a single if/else block. Funnel short-frame and SME-reject cleanup through a shared free_bss label for the abandon paths.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-24

Last Modified

2026-10-03

Generated

2026-10-15

AI Q&A

2026-09-24

EPSS Evaluated

2026-10-13

NVD

CVE-2026-93806

EUVD

EUVD-2026-86193

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves improper validation of association response frames in the cfg80211 subsystem. The function cfg80211_rx_assoc_resp() accesses status and information element (IE) fields in a management frame before confirming the frame has sufficient length for those offsets. This could lead to out-of-bounds memory access or undefined behavior if the frame is too short.

Detection Guidance

This vulnerability affects the Linux kernel's wifi configuration (cfg80211) and involves improper validation of association response frames. Detection requires checking kernel versions and monitoring for unusual wifi association behavior. No specific commands are provided in the context to directly detect this issue.

Impact Analysis

An attacker within wireless range could exploit this to cause a denial of service (system crash or instability) or potentially execute arbitrary code on affected systems. Systems using vulnerable Linux kernel versions with Wi-Fi functionality are at risk.

Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA as it is a low-level kernel issue related to WiFi association response validation. Compliance impacts would depend on how the vulnerability is exploited in a specific system context, which is not detailed here.

Mitigation Strategies

Immediate mitigation involves updating the Linux kernel to a patched version that includes the fix for this cfg80211 association response validation issue. Monitor vendor advisories for kernel updates addressing CVE-2026-93806.

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