CVE-2026-68220
Received Received - Intake

Memory Leak in Linux Kernel NXP IMX8-ISI Driver

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: media: nxp: imx8-isi: Add missing v4l2_subdev_cleanup() in crossbar and pipe Both mxc_isi_crossbar_init() and mxc_isi_pipe_init() call v4l2_subdev_init_finalize() which allocates the subdev active state, but neither mxc_isi_crossbar_cleanup() nor mxc_isi_pipe_cleanup() calls v4l2_subdev_cleanup() to free it. This causes a memory leak on every rmmod, reported by kmemleak: unreferenced object 0xffff0000d06fc800 (size 192): comm "(udev-worker)", pid 254, jiffies 4294913455 backtrace (crc 36eeae58): kmemleak_alloc+0x34/0x40 __kvmalloc_node_noprof+0x5f8/0x7d8 __v4l2_subdev_state_alloc+0x1fc/0x30c __v4l2_subdev_init_finalize+0x178/0x368 Add the missing v4l2_subdev_cleanup() calls before media_entity_cleanup() in both crossbar and pipe cleanup paths.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68220
EUVD
EUVD-2026-55321

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
nxp imx8-isi *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a memory leak in the Linux kernel's media subsystem, specifically in the NXP i.MX8 ISI driver. The issue occurs because two functions, mxc_isi_crossbar_init() and mxc_isi_pipe_init(), allocate memory using v4l2_subdev_init_finalize() but their cleanup counterparts, mxc_isi_crossbar_cleanup() and mxc_isi_pipe_cleanup(), fail to free this memory using v4l2_subdev_cleanup(). This results in a memory leak every time the module is removed.

Detection Guidance

This vulnerability is specific to the Linux kernel's media subsystem and involves a memory leak in the nxp imx8-isi driver. Detection requires checking for memory leaks using kmemleak or similar tools. Run 'sudo dmesg | grep kmemleak' to check for reported leaks. If kmemleak is enabled, it will show unreferenced objects during driver unloading (rmmod).

To enable kmemleak, run 'echo 1 | sudo tee /proc/sys/kernel/kmemleak'. Then reload the affected driver and check for leaks with 'sudo cat /sys/kernel/debug/kmemleak'.

Impact Analysis

The primary impact is system resource exhaustion over time. Memory leaks can gradually consume available RAM and kernel memory, potentially leading to performance degradation, system instability, or crashes. This is particularly problematic for systems running long-term without reboots, such as servers or embedded devices.

Mitigation Strategies

Apply the kernel patch that adds v4l2_subdev_cleanup() calls in mxc_isi_crossbar_cleanup() and mxc_isi_pipe_cleanup(). Update to a kernel version containing this fix. If immediate patching is not possible, avoid unloading the affected nxp imx8-isi driver to prevent memory leaks.

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