CVE-2026-93805 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, as well as users and administrators of systems utilizing the Linux kernel, particularly those with cfg80211 enabled, should verify and apply patches to prevent potential issues. Affected operators and platform administrators should review system configurations and ensure that necessary updates are applied. Vulnerability management and security teams should also be aware of this issue and take necessary actions tomit

Why it matters

A vulnerability in the Linux kernel's cfg80211 component has been addressed, involving rx/tx MLME callback frame length validation. Linux kernel developers, maintainers, and users should verify and apply patches to prevent potential issues.

• Potential out-of-bounds reads in cfg80211_rx_mlme_mgmt() and cfg80211_tx_mlme_mgmt() functions.
• Verification of frame length validation is necessary to prevent potential issues.
• Patching the Linux kernel to address this vulnerability is recommended.

Technical summary

The Linux kernel's cfg80211 component had a vulnerability related to rx/tx MLME callback frame length validation. The cfg80211_rx_mlme_mgmt() and cfg80211_tx_mlme_mgmt() functions did not properly validate frame lengths before accessing them, potentially leading to out-of-bounds reads. The issue has been addressed by adding frame-control length checks and validating subtype minimum frame sizes. This change ensures that the functions can handle frames of varying lengths correctly and prevents potential security issues.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the Linux kernel patches to ensure the cfg80211 component is updated.
• Verify the configuration and implementation of cfg80211 in your Linux kernel deployment.
• Monitor for any potential issues related to MLME callback frame handling.
• Perform a thorough review of system configurations and apply necessary patches.
• Ensure that all relevant Linux kernel subsystems are updated and monitored.
• Verify that compensating controls are in place for exposed systems.
• Track exceptions and retest remediated assets to confirm resolution.

Evidence notes

The CVE record and associated source references provide details on the vulnerability and its resolution in the Linux kernel. The issue was identified and addressed through modifications to cfg80211_rx_mlme_mgmt() and cfg80211_tx_mlme_mgmt().

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.