{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40037",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40037"
  ],
  "published": "2025-10-28T11:50:45Z",
  "summary": "fbdev: simplefb: Fix use after free in simplefb_detach_genpds()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: simplefb: Fix use after free in simplefb_detach_genpds()\n\nThe pm_domain cleanup can not be devres managed as it uses struct\nsimplefb_par which is allocated within struct fb_info by\nframebuffer_alloc(). This allocation is explicitly freed by\nunregister_framebuffer() in simplefb_remove().\nDevres managed cleanup runs after the device remove call and thus can no\nlonger access struct simplefb_par.\nCall simplefb_detach_genpds() explicitly from simplefb_destroy() like\nthe cleanup functions for clocks and regulators.\n\nFixes an use after free on M2 Mac mini during\naperture_remove_conflicting_devices() using the downstream asahi kernel\nwith Debian's kernel config. For unknown reasons this started to\nconsistently dereference an invalid pointer in v6.16.3 based kernels.\n\n[    6.736134] BUG: KASAN: slab-use-after-free in simplefb_detach_genpds+0x58/0x220\n[    6.743545] Read of size 4 at addr ffff8000304743f0 by task (udev-worker)/227\n[    6.750697]\n[    6.752182] CPU: 6 UID: 0 PID: 227 Comm: (udev-worker) Tainted: G S                  6.16.3-asahi+ #16 PREEMPTLAZY\n[    6.752186] Tainted: [S]=CPU_OUT_OF_SPEC\n[    6.752187] Hardware name: Apple Mac mini (M2, 2023) (DT)\n[    6.752189] Call trace:\n[    6.752190]  show_stack+0x34/0x98 (C)\n[    6.752194]  dump_stack_lvl+0x60/0x80\n[    6.752197]  print_report+0x17c/0x4d8\n[    6.752201]  kasan_report+0xb4/0x100\n[    6.752206]  __asan_report_load4_noabort+0x20/0x30\n[    6.752209]  simplefb_detach_genpds+0x58/0x220\n[    6.752213]  devm_action_release+0x50/0x98\n[    6.752216]  release_nodes+0xd0/0x2c8\n[    6.752219]  devres_release_all+0xfc/0x178\n[    6.752221]  device_unbind_cleanup+0x28/0x168\n[    6.752224]  device_release_driver_internal+0x34c/0x470\n[    6.752228]  device_release_driver+0x20/0x38\n[    6.752231]  bus_remove_device+0x1b0/0x380\n[    6.752234]  device_del+0x314/0x820\n[    6.752238]  platform_device_del+0x3c/0x1e8\n[    6.752242]  platform_device_unregister+0x20/0x50\n[    6.752246]  aperture_detach_platform_device+0x1c/0x30\n[    6.752250]  aperture_detach_devices+0x16c/0x290\n[    6.752253]  aperture_remove_conflicting_devices+0x34/0x50\n...\n[    6.752343]\n[    6.967409] Allocated by task 62:\n[    6.970724]  kasan_save_stack+0x3c/0x70\n[    6.974560]  kasan_save_track+0x20/0x40\n[    6.978397]  kasan_save_alloc_info+0x40/0x58\n[    6.982670]  __kasan_kmalloc+0xd4/0xd8\n[    6.986420]  __kmalloc_noprof+0x194/0x540\n[    6.990432]  framebuffer_alloc+0xc8/0x130\n[    6.994444]  simplefb_probe+0x258/0x2378\n...\n[    7.054356]\n[    7.055838] Freed by task 227:\n[    7.058891]  kasan_save_stack+0x3c/0x70\n[    7.062727]  kasan_save_track+0x20/0x40\n[    7.066565]  kasan_save_free_info+0x4c/0x80\n[    7.070751]  __kasan_slab_free+0x6c/0xa0\n[    7.074675]  kfree+0x10c/0x380\n[    7.077727]  framebuffer_release+0x5c/0x90\n[    7.081826]  simplefb_destroy+0x1b4/0x2c0\n[    7.085837]  put_fb_info+0x98/0x100\n[    7.089326]  unregister_framebuffer+0x178/0x320\n[    7.093861]  simplefb_remove+0x3c/0x60\n[    7.097611]  platform_remove+0x60/0x98\n[    7.101361]  device_remove+0xb8/0x160\n[    7.105024]  device_release_driver_internal+0x2fc/0x470\n[    7.110256]  device_release_driver+0x20/0x38\n[    7.114529]  bus_remove_device+0x1b0/0x380\n[    7.118628]  device_del+0x314/0x820\n[    7.122116]  platform_device_del+0x3c/0x1e8\n[    7.126302]  platform_device_unregister+0x20/0x50\n[    7.131012]  aperture_detach_platform_device+0x1c/0x30\n[    7.136157]  aperture_detach_devices+0x16c/0x290\n[    7.140779]  aperture_remove_conflicting_devices+0x34/0x50\n...",
  "affected": [
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      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
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        "1:6.12.25-1+rpt1",
        "1:6.12.34-1+rpt1~bookworm",
        "1:6.12.47-1+rpt1~bookworm"
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          },
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            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
          },
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            "binary_version": "1:6.12.20-1+rpt1~bpo12+1"
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            "assessment": "commit ancestry (strak rule)",
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      }
    },
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:13",
        "name": "linux"
      },
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.53"
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          },
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40037"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b1deb39cfd614fb2f278b71011692a8dbf0f05ba"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6ff0d8de8452ec0e18e5bd7394c2a23e7ff7353"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/da1bb9135213744e7ec398826c8f2e843de4fb94"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}