fbdev: simplefb: Fix use after free in simplefb_detach_genpds()

{
  "id": "13e269a2f28b70769ef99323b3b5a95c0e3a12b8cf50cc8536bfed09a421a7e9",
  "url": "https://osv.dev/vulnerability/CVE-2025-40037",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fbdev: simplefb: Fix use after free in simplefb_detach_genpds()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fbdev: simplefb: Fix use after free in simplefb_detach_genpds() The pm_domain cleanup can not be devres managed as it uses struct simplefb_par which is allocated within struct fb_info by framebuffer_alloc(). This allocation is explicitly freed by unregister_framebuffer() in simplefb_remove(). Devres managed cleanup runs after the device remove call and thus can no longer access struct simplefb_par. Call simplefb_detach_genpds() explicitly from simplefb_destroy() like the cleanup functions for clocks and regulators. Fixes an use after free on M2 Mac mini during aperture_remove_conflicting_devices() using the downstream asahi kernel with Debian's kernel config. For unknown reasons this started to consistently dereference an invalid pointer in v6.16.3 based kernels. [ 6.736134] BUG: KASAN: slab-use-after-free in simplefb_detach_genpds+0x58/0x220 [ 6.743545] Read of size 4 at addr ffff8000304743f0 by task (udev-worker)/227 [ 6.750697] [ 6.752182] CPU: 6 UID: 0 PID: 227 Comm: (udev-worker) Tainted: G S 6.16.3-asahi+ #16 PREEMPTLAZY [ 6.752186] Tainted: [S]=CPU_OUT_OF_SPEC [ 6.752187] Hardware name: Apple Mac mini (M2, 2023) (DT) [ 6.752189] Call trace: [ 6.752190] show_stack+0x34/0x98 (C) [ 6.752194] dump_stack_lvl+0x60/0x80 [ 6.752197] print_report+0x17c/0x4d8 [ 6.752201] kasan_report+0xb4/0x100 [ 6.752206] __asan_report_load4_noabort+0x20/0x30 [ 6.752209] simplefb_detach_genpds+0x58/0x220 [ 6.752213] devm_action",
    "evidence": "osv:CVE-2025-40037",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.53",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.17.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-40037",
      "aliases": [
        "CVE-2025-40037"
      ],
      "affected": [
        {
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
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                  "fixed": "b1deb39cfd614fb2f278b71011692a8dbf0f05ba"
                },
                {
                  "fixed": "b6ff0d8de8452ec0e18e5bd7394c2a23e7ff7353"
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                {
                  "fixed": "da1bb9135213744e7ec398826c8f2e843de4fb94"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40037.json"
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.8.0"
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                {
                  "fixed": "6.12.53"
                }
              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.13.0"
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                  "fixed": "6.17.3"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40037.json"
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      ],
      "modified": "2026-10-28T02:30:28.206607131Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/b1deb39cfd614fb2f278b71011692a8dbf0f05ba",
        "https://git.kernel.org/stable/c/b6ff0d8de8452ec0e18e5bd7394c2a23e7ff7353",
        "https://git.kernel.org/stable/c/da1bb9135213744e7ec398826c8f2e843de4fb94",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40037.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40037",
        "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/2025/40xxx/CVE-2025-40037.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-40037",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494966,
  "published_at": "2025-10-28T11:48:18.274+00:00"
}