External risk intelligence

Linux Kernel ixgbe Panic on High CPU Count XDP Transmit.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2023-54090

This is a kernel-level memory management issue within a network driver (ixgbe) specifically related to CPU scheduling and internal ring buffer indexing during XDP operations. It is a low-level driver defect that does not expose a reachable network service, interface, or protocol to the internet.

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

A recently resolved issue in the Linux kernel's network driver could lead to system instability when operating on systems with a large number of CPUs. This vulnerability specifically affects how network data is processed under high-load conditions, potentially causing a kernel panic. The primary concern is to confirm if this specific driver component is in use within your environment.

Kernel instability affecting network processing.
Matters if large CPU count systems are active.
Confirm relevance and exposure of this driver.

Attack Path

How an attacker could exploit the issue

An attacker could trigger a kernel panic by exploiting how the Linux kernel's network driver handles network data processing on systems with a large number of CPUs. This occurs when processing specific network traffic, leading to a system crash.

Requires high CPU core count.
Triggers on network data processing.
Results in a kernel crash.

Live Threat

Current exploitation, exposure, and threat context

The Linux kernel's ixgbe network driver could experience a kernel panic when handling XDP programs on systems with more than 64 CPUs. This panic occurs due to an incorrect calculation for indexing XDP TX rings, leading to an array-index-out-of-bounds error.

Kernel panic affecting network operations.
System instability due to incorrect XDP ring indexing.
Potential for denial of service when supported.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts the Linux kernel's ixgbe network driver, specifically when processing XDP programs on systems with more than 64 CPUs. The likely responsible teams are Infrastructure or Platform teams managing the operating system and its core components. The first practical step is to inventory all systems running this kernel version, identify those with >64 CPUs and XDP enabled, and assess business criticality before planning remediation.

Infrastructure or Platform teams own remediation.
Verify systems with >64 CPUs and XDP.
Plan mitigation and update kernel.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is the ixgbe driver in the Linux kernel?

The ixgbe driver is a kernel-level component used to manage network connectivity for specific Intel 10-Gigabit Ethernet adapters. It handles data transmission and reception between the hardware and the operating system. In high-performance environments, this driver often supports XDP (eXpress Data Path), a feature that allows network packets to be processed very quickly before they reach the higher layers of the networking stack.

What does CVE-2023-54090 mean for system stability?

This vulnerability is an array-index-out-of-bounds error. It occurs because the driver incorrectly calculates where to place outgoing data packets in memory when a system has more than 64 CPU cores. Because the driver attempts to access an invalid memory location, it causes a kernel panic, which results in the system crashing unexpectedly.

How is this kernel panic triggered?

The crash is triggered when the kernel runs XDP programs on systems with more than 64 CPUs. If the system has 64 or fewer CPUs, the current calculation remains within valid bounds, and the issue does not occur. It specifically requires the combination of high core counts and the active use of XDP functionality within the ixgbe driver.

Why does Halo Surface Signal rate this as very unlikely?

Halo Surface Signal indicates this is a low-level driver defect rather than a flaw in a public-facing network service or protocol. Because it is a memory management issue tied to internal CPU scheduling and data structures, it does not expose an entry point that an attacker can reach directly from the internet to execute code.

What should I do if I run systems with this driver?

First, perform an inventory to identify which of your servers use the ixgbe driver and have more than 64 CPU cores. If your systems meet both criteria and are actively using XDP, verify your current kernel version. Coordinate with your infrastructure or platform team to review available kernel updates that contain the fix for this specific indexing error.

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.