media: nxp: imx8-isi: Fix use-after-free on remove (CVE-2026-64421) | HOL Guard CVE

High · CVSS 7.8CVE-2026-64421

media: nxp: imx8-isi: Fix use-after-free on remove

Answer in brief

CVE-2026-64421 records a High severity (CVSS 7.8) vulnerability in media: nxp: imx8-isi: Fix use-after-free on remove. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 25, 2026Updated Sep 4, 2026Source checked Oct 1, 2026First seen by HOL Aug 11, 2026Material review Sep 4, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.8
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=cf21f328fcafacf4f96e7a30ef9dceede1076378 <d22fb719654bfde6f682c9f14629f5f9534175b7 \|\| >=cf21f328fcafacf4f96e7a30ef9dceede1076378 <ba2aa5d325270cd965c44458c5ff5ab555e6af51 \|\| >=cf21f328fcafacf4f96e7a30ef9dceede1076378 <ef382a6baf0a95cf199fdf6bba2fd08e58b0a249 \|\| >=cf21f328fcafacf4f96e7a30ef9dceede1076378 <c12a5b2261351cd3b03921ce4720332ff5184b50 \|\| >=cf21f328fcafacf4f96e7a30ef9dceede1076378 <b670bf89824ede5d07d20bb9bfbafb754846081d	d22fb719654bfde6f682c9f14629f5f9534175b7, ba2aa5d325270cd965c44458c5ff5ab555e6af51, ef382a6baf0a95cf199fdf6bba2fd08e58b0a249, c12a5b2261351cd3b03921ce4720332ff5184b50, b670bf89824ede5d07d20bb9bfbafb754846081d
Linux/Linuxgeneric	6.4	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to d22fb719654bfde6f682c9f14629f5f9534175b7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.