CVE-2026-93063

What it actually does

Failure to validate SAP message length before copying into a fixed local buffer allows an oversized message to overflow the buffer in the iwlwifi mei handler, causing memory corruption with high confidentiality, integrity, and availability impact.

Why it matters to the business

Local attackers can crash affected Linux systems or execute arbitrary code on devices using Intel wireless hardware, leading to full machine compromise and potential data loss or service disruption.

How an attack unfolds

An attacker with local access on a vulnerable system crafts an oversized SAP message and supplies it via the MEI interface; the missing length check allows the overflow to corrupt adjacent memory for code execution or denial of service.

How to fix it

Update the Linux kernel to a patched version containing the SAP message length validation before the read operation.

How to confirm the fix worked

Inspect kernel source or running version for the added length check; attempt to send oversized SAP messages and confirm the operation is rejected without overflow.

Typical attack path

1. Gain local shell or process execution on the target Linux system
2. Interact with the iwlwifi mei subsystem to deliver a crafted oversized SAP message
3. Trigger the unchecked buffer copy to achieve memory corruption and arbitrary code execution

How to detect it

Review kernel logs for iwlwifi mei buffer or message-size errors; correlate with unexpected process crashes or privilege changes on systems using the affected driver.

What your security team should do

• Apply the kernel fix at the earliest maintenance window given the high local impact
• Limit untrusted local access on systems with Intel Wi-Fi hardware
• Monitor kernel logs for mei-related crashes or anomalies