CVE-2026-64421

Analyzed Analyzed - Analysis Complete

Use-After-Free in NXP i.MX8 ISI Linux Kernel Driver

Publication date: 2026-07-25

Last updated on: 2026-09-04

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: media: nxp: imx8-isi: Fix use-after-free on remove KASAN reports a slab-use-after-free in __media_entity_remove_link() during rmmod of imx8_isi: BUG: KASAN: slab-use-after-free in __media_entity_remove_link+0x608/0x650 Read of size 2 at addr ffff0000d47cb02a by task rmmod/724 Call trace: __media_entity_remove_link+0x608/0x650 __media_entity_remove_links+0x78/0x144 __media_device_unregister_entity+0x150/0x280 media_device_unregister_entity+0x48/0x68 v4l2_device_unregister_subdev+0x158/0x300 v4l2_async_unbind_subdev_one+0x22c/0x358 v4l2_async_nf_unbind_all_subdevs+0xfc/0x1c0 v4l2_async_nf_unregister+0x5c/0x14c mxc_isi_remove+0x124/0x2a0 [imx8_isi] Allocated by task 249: __kmalloc_noprof+0x27c/0x690 mxc_isi_crossbar_init+0x22c/0x560 [imx8_isi] Freed by task 724: kfree+0x1e4/0x5b0 mxc_isi_crossbar_cleanup+0x34/0x80 [imx8_isi] mxc_isi_remove+0x11c/0x2a0 [imx8_isi] The problem is that mxc_isi_remove() calls mxc_isi_crossbar_cleanup() before mxc_isi_v4l2_cleanup(). The crossbar cleanup frees the media entity pads, but the subsequent v4l2 cleanup still tries to remove media links that reference those pads. Fix this by calling mxc_isi_v4l2_cleanup() before mxc_isi_crossbar_cleanup() to ensure all media entities are properly unregistered while the pads are still valid.

CVSS Scores

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Meta Information

Published

2026-07-25

Last Modified

2026-09-04

Generated

2026-09-23

AI Q&A

2026-07-25

EPSS Evaluated

2026-09-22

NVD

CVE-2026-64421

EUVD

EUVD-2026-48965

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.19 (inc) to 7.1.4 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.40 (exc)
linux	linux_kernel	From 6.7 (inc) to 6.12.97 (exc)
linux	linux_kernel	From 6.4 (inc) to 6.6.145 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This is a use-after-free vulnerability in the Linux kernel's media subsystem, specifically in the NXP i.MX8 ISI driver. It occurs when the driver is unloaded (rmmod) and involves a freed memory access in the media entity link removal function. The issue stems from improper cleanup order where media entity pads are freed before media links referencing them are removed.

Detection Guidance

This vulnerability is specific to the Linux kernel's media subsystem, particularly the imx8-isi driver. Detection requires checking kernel logs for slab-use-after-free errors related to media entity removal. Monitor dmesg or syslog for messages like 'BUG: KASAN: slab-use-after-free' during module removal. Commands: dmesg | grep -i 'use-after-free' or journalctl -k | grep -i 'use-after-free'.

Impact Analysis

This vulnerability could cause system instability or crashes when unloading the imx8_isi kernel module. It may lead to kernel panics, memory corruption, or denial of service conditions on systems using NXP i.MX8 ISI devices. Attackers with local access could potentially exploit this to escalate privileges.

Compliance Impact

This vulnerability is a use-after-free issue in the Linux kernel's media subsystem, specifically in the NXP i.MX8 ISI driver. It does not directly relate to data privacy, security controls, or regulatory compliance requirements such as GDPR or HIPAA. The issue involves improper cleanup during module removal, which could lead to system instability or crashes but does not inherently impact data protection or access controls.

Mitigation Strategies

Apply the kernel patch that reorders cleanup calls in mxc_isi_remove() to call mxc_isi_v4l2_cleanup() before mxc_isi_crossbar_cleanup(). Update to a kernel version containing the fix. If immediate patching is not possible, avoid unloading the imx8_isi module until a fix is applied.

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