CVE-2025-23259: NVIDIA Mellanox DPDK PMD Vulnerability

CVE-2025-23259 Overview

CVE-2025-23259 affects the NVIDIA Mellanox Data Plane Development Kit (DPDK) Poll Mode Driver (PMD). An attacker operating from a virtual machine within the system can trigger a race condition that leads to information disclosure and denial of service on the network interface. The flaw is categorized under [CWE-362] (Concurrent Execution using Shared Resource with Improper Synchronization). NVIDIA published guidance for this issue in Support Answer #5655.

Critical Impact
An attacker on a co-resident virtual machine can disclose limited data from the shared network interface and disrupt network availability for other tenants on the host.

Affected Products

NVIDIA Mellanox DPDK Poll Mode Driver (PMD)
Systems using Mellanox network adapters with the affected DPDK PMD
Virtualized environments exposing the Mellanox PMD to guest virtual machines

Discovery Timeline

2025-09-04 - CVE-2025-23259 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-23259

Vulnerability Analysis

The vulnerability resides in the Poll Mode Driver (PMD) component of NVIDIA Mellanox DPDK. DPDK PMDs bypass the kernel network stack to poll network interfaces directly from user space for high-throughput packet processing. When multiple virtual machines share access to a Mellanox interface through DPDK, improper synchronization of shared resources creates an exploitable race window.

An attacker running code inside a guest VM can time operations against the PMD to observe or corrupt state that should remain isolated. Successful exploitation results in disclosure of limited confidential data and disruption of the network interface, impacting availability for other workloads sharing the adapter. The exploitation complexity is high, requiring precise timing to win the race condition.

Root Cause

The root cause is a race condition [CWE-362] in the concurrent handling of shared resources within the Mellanox PMD. Two or more execution contexts access shared state without adequate synchronization primitives. This allows an attacker to interleave operations between check and use, exposing data or driving the interface into an inconsistent state.

Attack Vector

The attack originates from a virtual machine that has legitimate access to a Mellanox network interface managed by the vulnerable DPDK PMD. The attacker does not require prior authentication to the host or hypervisor. Exploitation is network-adjacent from the perspective of the shared hardware resource but requires code execution within a co-resident guest. No user interaction is needed. See the NVIDIA Support Answer #5655 for vendor technical details.

No public proof-of-concept exploit code has been released. The vulnerability is described in prose only, consistent with the absence of verified exploit examples in public repositories.

Detection Methods for CVE-2025-23259

Indicators of Compromise

Unexpected packet loss, link flaps, or reset events on Mellanox interfaces bound to DPDK PMDs
Guest VM processes exhibiting sustained polling or timing loops against shared PMD resources
Abnormal ring buffer or queue statistics reported by DPDK telemetry counters
Host-side kernel or hypervisor log entries indicating repeated PMD reinitializations

Detection Strategies

Baseline DPDK PMD performance counters and alert on statistical deviations that correlate with guest activity
Correlate guest VM CPU spikes with host-side network interface degradation events
Monitor for repeated failed or partial DPDK control-plane operations originating from a single tenant

Monitoring Recommendations

Enable and forward DPDK telemetry to a centralized log analytics platform for anomaly review
Track per-VM network interface availability metrics and interface reset counts
Review NVIDIA advisories referenced in the NVD entry for CVE-2025-23259 for updated indicators

How to Mitigate CVE-2025-23259

Immediate Actions Required

Apply the NVIDIA-provided fix documented in NVIDIA Support Answer #5655
Inventory all hosts running Mellanox DPDK PMDs and identify systems exposing the driver to untrusted guest VMs
Restrict which tenants are permitted to bind to Mellanox interfaces through DPDK until patches are deployed

Patch Information

NVIDIA released a security advisory addressing CVE-2025-23259. Refer to NVIDIA Support Answer #5655 for the fixed DPDK PMD versions and upgrade procedures. Verify the version deployed on each host matches or exceeds the fixed release identified by the vendor. The authoritative record is available in the CVE.org entry for CVE-2025-23259.

Workarounds

Isolate untrusted virtual machines onto hosts that do not expose the Mellanox DPDK PMD
Fall back to kernel-mode Mellanox drivers for tenants that do not require DPDK acceleration
Enforce strict tenant separation policies at the hypervisor to reduce co-residency risk on affected hosts

bash

# Verify installed DPDK version on affected hosts
dpdk-devbind.py --status
pkg-config --modversion libdpdk

# Consult NVIDIA Support Answer #5655 for the fixed version and
# upgrade the Mellanox DPDK PMD package per vendor instructions.