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

{
  "id": "51efafab36c9af5a7a5403629aeb8f30d3d21eecb413066bf84c647b43cef9d5",
  "url": "https://osv.dev/vulnerability/CVE-2026-64421",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "media: nxp: imx8-isi: Fix use-after-free on remove",
    "summary": "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.",
    "evidence": "osv:CVE-2026-64421",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.145",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.97",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-64421",
      "aliases": [
        "CVE-2026-64421"
      ],
      "affected": [
        {
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              "type": "GIT",
              "events": [
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                  "fixed": "d22fb719654bfde6f682c9f14629f5f9534175b7"
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                {
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                {
                  "fixed": "c12a5b2261351cd3b03921ce4720332ff5184b50"
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                {
                  "fixed": "b670bf89824ede5d07d20bb9bfbafb754846081d"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64421.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.0"
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                {
                  "fixed": "6.6.145"
                }
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.7.0"
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                {
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              "events": [
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                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.40"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.4"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64421.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.442813632Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/b670bf89824ede5d07d20bb9bfbafb754846081d",
        "https://git.kernel.org/stable/c/ba2aa5d325270cd965c44458c5ff5ab555e6af51",
        "https://git.kernel.org/stable/c/c12a5b2261351cd3b03921ce4720332ff5184b50",
        "https://git.kernel.org/stable/c/d22fb719654bfde6f682c9f14629f5f9534175b7",
        "https://git.kernel.org/stable/c/ef382a6baf0a95cf199fdf6bba2fd08e58b0a249",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64421.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64421",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64421.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64421",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 508850,
  "published_at": "2026-07-25T08:50:59.926+00:00"
}