External risk intelligence

Linux Kernel MANA RX DMA Sync Issue

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-72064

This vulnerability exists within the Linux kernel network driver for specific hardware (MANA) and relates to low-level DMA memory synchronization during packet reception. It is not a service or application reachable via the internet, but rather a driver-level implementation detail that does not expose a public-facing interface.

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory concerns a vulnerability within the Linux kernel's network component, specifically related to how it handles received data. The issue could prevent correct data processing in certain network configurations. The main concern is confirming relevance and exposure.

Kernel network data handling flaw.
Matters for specific network configurations.
Confirm relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted network packets to a vulnerable system. This could lead to memory corruption and potentially allow an attacker to gain control of the system or disrupt its normal operation.

Network access required.
Triggered by receiving network packets.
Data corruption and potential system compromise.

Live Threat

Current exploitation, exposure, and threat context

In specific Linux kernel configurations requiring explicit DMA syncing, a missing synchronization step could lead to incorrect handling of received network packet data before it is passed to the networking stack. This affects systems that utilize the MANA network driver and are booted with certain parameters, potentially disrupting network reception.

Packet data integrity could be affected.
Incorrect data may be passed to the stack.
Network reception may be broken.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Linux kernel's network driver for MANA hardware is affected by a vulnerability related to DMA synchronization. This issue primarily impacts infrastructure and platform teams responsible for the Linux kernel and network stack. The immediate action required is to identify all systems utilizing the MANA hardware, confirm their business criticality, and locate the specific system owners before planning any remediation.

Infrastructure and platform teams own this issue.
Verify MANA hardware usage and system criticality.
Plan and coordinate kernel updates or driver fixes.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is the Linux kernel MANA driver?

The MANA (Microsoft Azure Network Adapter) driver is a component within the Linux kernel designed to enable high-performance network communication for specific hardware used in cloud environments. It manages how the operating system interacts with the network interface card to send and receive data packets efficiently.

Why does CVE-2026-72064 occur?

This vulnerability involves a memory synchronization flaw. When the driver processes incoming network packets, it fails to perform a necessary operation called a DMA (Direct Memory Access) sync. This causes the system to pass unverified or incorrect data from the hardware to the networking stack, which can lead to memory corruption.

How is this vulnerability triggered?

An attacker triggers this by sending specially crafted network packets to a system running the affected MANA driver. It is important to note that this bug does not occur on all systems; it specifically impacts configurations that require explicit DMA syncing, such as those booted with swiotlb=force settings.

Is my system at risk according to Halo Surface Signal?

It is very unlikely. Halo Surface Signal identifies this as a low-level driver issue rather than a service reachable via the internet. Because the vulnerability exists within internal hardware memory management, it does not expose a public-facing interface that an external attacker can easily reach.

Do I need to update my kernel immediately?

First, verify if your infrastructure utilizes the MANA network hardware. If it does, determine if your specific kernel configuration requires explicit DMA syncing. Once relevance is confirmed, coordinate with your platform team to plan for kernel or driver updates to ensure data integrity.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.