CVE-2026-23160: Linux Kernel Memory Leak Vulnerability

CVE-2026-23160 Overview

A memory leak vulnerability has been identified in the Linux kernel's octeon_ep network driver. Specifically, the octep_device_setup() function fails to properly clean up allocated resources when octep_ctrl_net_init() encounters an error condition. This improper error handling results in mapped resources remaining allocated and configuration memory not being freed, leading to a gradual depletion of system memory.

Critical Impact

Systems utilizing the Octeon endpoint network driver may experience memory exhaustion over time due to resource leaks during failed device initialization attempts.

Affected Products

• Linux kernel with octeon_ep driver enabled
• Systems using Marvell/Cavium Octeon endpoint devices
• Network configurations utilizing octeon_ep module

Discovery Timeline

• February 14, 2026 - CVE-2026-23160 published to NVD
• February 18, 2026 - Last updated in NVD database

Technical Details for CVE-2026-23160

Vulnerability Analysis

This vulnerability represents a Memory Leak flaw in the Linux kernel's octeon_ep network driver. The issue occurs within the octep_device_setup() function, which is responsible for initializing Octeon endpoint network devices. When the initialization routine calls octep_ctrl_net_init() and that function fails, the error handling path returns directly from the function without performing necessary cleanup operations.

The missing cleanup includes unmapping previously mapped I/O resources and freeing allocated configuration memory structures. Under normal operation, these resources would be released when the device setup fails, but due to the flawed error handling, they remain allocated in kernel memory.

Root Cause

The root cause of this vulnerability is improper error handling in the octep_device_setup() function. When octep_ctrl_net_init() fails, the function returns immediately with an error code instead of jumping to the unsupported_dev label, which contains the necessary cleanup logic. This creates an inconsistent error handling pattern compared to other failure paths within the same function that properly perform resource cleanup before returning.

The issue was identified through static analysis tooling and subsequent code review, which revealed that the error path for octep_ctrl_net_init() failure diverged from the established cleanup pattern used elsewhere in the function.

Attack Vector

The attack vector for this vulnerability involves triggering repeated device initialization failures in the octeon_ep driver. While the vulnerability was discovered through code analysis and requires specific hardware or driver conditions, an attacker with local access could potentially:

• Cause repeated driver initialization failures through malformed device configurations
• Gradually exhaust system memory through accumulated resource leaks
• Eventually cause system instability or denial of service through memory exhaustion

The vulnerability requires local access and specific conditions where the octep_ctrl_net_init() function repeatedly fails during device setup operations.

Detection Methods for CVE-2026-23160

Indicators of Compromise

• Gradual increase in kernel memory usage without corresponding workload increase
• Presence of orphaned memory mappings related to octeon_ep driver resources
• System log entries indicating repeated octep_ctrl_net_init() failures
• Memory pressure warnings in systems running the octeon_ep driver

Detection Strategies

• Monitor kernel memory allocation patterns using tools like /proc/meminfo and slabinfo
• Configure kernel memory leak detection features such as kmemleak when available
• Review system logs for octeon_ep driver initialization failures
• Use SentinelOne Singularity Platform to detect abnormal kernel memory consumption patterns

Monitoring Recommendations

• Implement continuous monitoring of kernel memory utilization on systems with octeon_ep driver
• Set up alerts for unusual memory growth patterns in network driver subsystems
• Enable kernel debugging options to track memory allocation and deallocation
• Deploy SentinelOne agents to monitor for resource exhaustion conditions and system stability issues

How to Mitigate CVE-2026-23160

Immediate Actions Required

• Apply the kernel patches from the official kernel Git repository
• Restart systems after patching to ensure clean memory state
• Review system memory utilization to identify any pre-existing resource leaks
• Consider temporarily unloading the octeon_ep driver if patching is delayed

Patch Information

The Linux kernel developers have released patches to address this vulnerability. The fix modifies the error handling in octep_device_setup() to properly jump to the unsupported_dev label when octep_ctrl_net_init() fails, ensuring consistent cleanup of mapped resources and allocated configuration memory.

Patches are available through the official kernel Git repository:

• Kernel Git Commit 5058d3f8f172
• Kernel Git Commit 8016dc5ee19a
• Kernel Git Commit d753f3c3f9d7
• Kernel Git Commit fdfd28e13c24

Workarounds

• Unload the octeon_ep module if not required for system operations using modprobe -r octeon_ep
• Blacklist the octeon_ep driver module to prevent automatic loading
• Implement scheduled system reboots to reclaim leaked memory as a temporary measure
• Monitor memory usage closely and plan for patching during the next maintenance window

# Temporary workaround: Blacklist the octeon_ep driver
echo "blacklist octeon_ep" | sudo tee /etc/modprobe.d/octeon_ep-blacklist.conf
sudo update-initramfs -u