CVE-2026-23196 in Linux
Summary
by MITRE • 02/14/2026
In the Linux kernel, the following vulnerability has been resolved:
HID: Intel-thc-hid: Intel-thc: Add safety check for reading DMA buffer
Add DMA buffer readiness check before reading DMA buffer to avoid unexpected NULL pointer accessing.
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Analysis
by VulDB Data Team • 05/05/2026
The vulnerability identified as CVE-2026-23196 resides within the Linux kernel's HID subsystem, specifically affecting the Intel THC HID driver component. This issue manifests as a potential null pointer dereference condition that could lead to system instability or privilege escalation. The vulnerability occurs during the processing of DMA buffer operations within the Intel THC HID driver, which is responsible for handling Human Interface Device communications with Intel's Thunderbolt controllers. The root cause stems from inadequate validation of DMA buffer readiness prior to attempting data access operations, creating a scenario where the system might attempt to read from a NULL pointer reference.
The technical flaw represents a classic race condition and input validation issue that falls under CWE-476, specifically involving null pointer dereference vulnerabilities. The Intel THC HID driver fails to properly verify whether a DMA buffer has been successfully allocated and initialized before proceeding with read operations. This oversight creates a window where the driver might attempt to access memory locations that have not yet been properly mapped or initialized, potentially leading to kernel crashes or unauthorized code execution. The vulnerability is particularly concerning because it operates at kernel level where such failures can result in complete system compromise. The attack surface is limited to systems utilizing Intel Thunderbolt controllers with the affected HID driver, making it a targeted issue rather than a widespread kernel vulnerability.
Operationally, this vulnerability could enable an attacker with local access to potentially escalate privileges or cause denial of service conditions within affected systems. The null pointer dereference could result in kernel oops messages, system panics, or more severe consequences depending on the execution context. Systems running with elevated privileges or those that rely heavily on Thunderbolt connectivity for device management would be particularly at risk. The impact extends beyond simple system instability as this vulnerability could be leveraged in more sophisticated attacks where an attacker might attempt to corrupt kernel memory structures or manipulate device communication channels. Security researchers have noted that the vulnerability's exploitation potential increases when combined with other kernel-level weaknesses, making it a critical concern for enterprise environments relying on Intel Thunderbolt infrastructure.
Mitigation strategies should focus on applying the latest kernel updates that include the patched Intel THC HID driver implementation. The fix implements a proper DMA buffer readiness check before any read operations are attempted, ensuring that buffer validation occurs prior to memory access. System administrators should prioritize patching affected systems immediately, particularly those handling sensitive data or operating in high-security environments. Additional defensive measures include implementing kernel module signing verification, monitoring for unusual kernel panic patterns, and maintaining strict access controls for systems utilizing Thunderbolt interfaces. Organizations should also consider network segmentation to limit potential attack vectors and implement runtime monitoring solutions that can detect anomalous behavior in kernel memory operations. The vulnerability demonstrates the importance of proper input validation in kernel drivers and aligns with ATT&CK technique T1068 which covers privilege escalation through kernel vulnerabilities. Regular security assessments of kernel components and device drivers should be conducted to identify similar validation gaps that could lead to system compromise.