CVE-2026-68219 in Linux
Summary
by MITRE • 08/10/2026
In the Linux kernel, the following vulnerability has been resolved:
media: nxp: imx8-isi: Fix potential out-of-bounds issues
The maximum downscaling factor supported by ISI can be up to 16. Add minimum value constraint before applying the setting to hardware. Otherwise, the process will not respond even when Ctrl+C is executed.
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Analysis
by VulDB Data Team • 08/10/2026
The vulnerability identified in the Linux kernel's nxp imx8-isi media driver represents a critical out-of-bounds memory access issue that can lead to system instability and denial of service conditions. This flaw exists within the image sensor interface subsystem responsible for handling video capture operations on NXP i.MX 8 series processors. The vulnerability specifically affects the downscaling factor configuration mechanism where the hardware supports a maximum downscaling ratio of sixteen times, but insufficient input validation allows for invalid parameter values to be passed to the underlying hardware registers.
The technical implementation of this vulnerability stems from inadequate boundary checking within the driver's configuration processing logic. When an application attempts to set a downscaling factor value that falls outside the acceptable range supported by the hardware, the driver fails to validate these parameters before transmitting them to the actual ISi hardware component. This lack of input sanitization creates a scenario where malformed or excessively large downscaling values can be written to hardware registers, potentially causing memory corruption or register state inconsistencies.
The operational impact of this vulnerability manifests as complete system hang conditions where the affected process becomes unresponsive to user interrupts and standard termination signals. Even when users attempt to terminate the process using Ctrl+C or other interrupt mechanisms, the system remains locked in an indeterminate state due to the hardware-level corruption caused by the out-of-bounds register writes. This behavior directly violates the principle of graceful degradation and can result in complete system lockup requiring physical reset or power cycle to restore normal operation.
The vulnerability aligns with CWE-129, which addresses insufficient input validation, and specifically relates to improper bounds checking in hardware configuration interfaces. From an ATT&CK framework perspective, this represents a privilege escalation vector through process hijacking and resource exhaustion techniques that can be exploited by malicious actors to cause persistent denial of service conditions. The flaw demonstrates poor defensive programming practices where parameter validation occurs only at the application layer rather than being enforced at the kernel driver level.
The recommended mitigation strategy involves implementing strict minimum value constraints before any hardware register modifications are executed, ensuring that all downscaling factor values fall within the supported range of 1 to 16. This requires adding comprehensive input validation logic that checks against both minimum and maximum boundary conditions before writing configuration parameters to hardware registers. Additionally, implementing proper error handling mechanisms with timeout controls and recovery procedures can help prevent indefinite hang conditions while maintaining system stability during legitimate configuration operations. The fix should also include enhanced logging capabilities to monitor for suspicious parameter values and provide forensic data for security analysis purposes.