CVE-2025-40037 (GCVE-0-2025-40037)

Vulnerability from cvelistv5 – Published: 2025-10-28 11:48 – Updated: 2026-05-11 21:41
VLAI
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_release+0x50/0x98 [ 6.752216] release_nodes+0xd0/0x2c8 [ 6.752219] devres_release_all+0xfc/0x178 [ 6.752221] device_unbind_cleanup+0x28/0x168 [ 6.752224] device_release_driver_internal+0x34c/0x470 [ 6.752228] device_release_driver+0x20/0x38 [ 6.752231] bus_remove_device+0x1b0/0x380 [ 6.752234] device_del+0x314/0x820 [ 6.752238] platform_device_del+0x3c/0x1e8 [ 6.752242] platform_device_unregister+0x20/0x50 [ 6.752246] aperture_detach_platform_device+0x1c/0x30 [ 6.752250] aperture_detach_devices+0x16c/0x290 [ 6.752253] aperture_remove_conflicting_devices+0x34/0x50 ... [ 6.752343] [ 6.967409] Allocated by task 62: [ 6.970724] kasan_save_stack+0x3c/0x70 [ 6.974560] kasan_save_track+0x20/0x40 [ 6.978397] kasan_save_alloc_info+0x40/0x58 [ 6.982670] __kasan_kmalloc+0xd4/0xd8 [ 6.986420] __kmalloc_noprof+0x194/0x540 [ 6.990432] framebuffer_alloc+0xc8/0x130 [ 6.994444] simplefb_probe+0x258/0x2378 ... [ 7.054356] [ 7.055838] Freed by task 227: [ 7.058891] kasan_save_stack+0x3c/0x70 [ 7.062727] kasan_save_track+0x20/0x40 [ 7.066565] kasan_save_free_info+0x4c/0x80 [ 7.070751] __kasan_slab_free+0x6c/0xa0 [ 7.074675] kfree+0x10c/0x380 [ 7.077727] framebuffer_release+0x5c/0x90 [ 7.081826] simplefb_destroy+0x1b4/0x2c0 [ 7.085837] put_fb_info+0x98/0x100 [ 7.089326] unregister_framebuffer+0x178/0x320 [ 7.093861] simplefb_remove+0x3c/0x60 [ 7.097611] platform_remove+0x60/0x98 [ 7.101361] device_remove+0xb8/0x160 [ 7.105024] device_release_driver_internal+0x2fc/0x470 [ 7.110256] device_release_driver+0x20/0x38 [ 7.114529] bus_remove_device+0x1b0/0x380 [ 7.118628] device_del+0x314/0x820 [ 7.122116] platform_device_del+0x3c/0x1e8 [ 7.126302] platform_device_unregister+0x20/0x50 [ 7.131012] aperture_detach_platform_device+0x1c/0x30 [ 7.136157] aperture_detach_devices+0x16c/0x290 [ 7.140779] aperture_remove_conflicting_devices+0x34/0x50 ...
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 92a511a568e44cf11681a2223cae4d576a1a515d , < b1deb39cfd614fb2f278b71011692a8dbf0f05ba (git)
Affected: 92a511a568e44cf11681a2223cae4d576a1a515d , < b6ff0d8de8452ec0e18e5bd7394c2a23e7ff7353 (git)
Affected: 92a511a568e44cf11681a2223cae4d576a1a515d , < da1bb9135213744e7ec398826c8f2e843de4fb94 (git)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.12.53 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/simplefb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b1deb39cfd614fb2f278b71011692a8dbf0f05ba",
              "status": "affected",
              "version": "92a511a568e44cf11681a2223cae4d576a1a515d",
              "versionType": "git"
            },
            {
              "lessThan": "b6ff0d8de8452ec0e18e5bd7394c2a23e7ff7353",
              "status": "affected",
              "version": "92a511a568e44cf11681a2223cae4d576a1a515d",
              "versionType": "git"
            },
            {
              "lessThan": "da1bb9135213744e7ec398826c8f2e843de4fb94",
              "status": "affected",
              "version": "92a511a568e44cf11681a2223cae4d576a1a515d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/simplefb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.53",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.3",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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..."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:41:15.693Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b1deb39cfd614fb2f278b71011692a8dbf0f05ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6ff0d8de8452ec0e18e5bd7394c2a23e7ff7353"
        },
        {
          "url": "https://git.kernel.org/stable/c/da1bb9135213744e7ec398826c8f2e843de4fb94"
        }
      ],
      "title": "fbdev: simplefb: Fix use after free in simplefb_detach_genpds()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40037",
    "datePublished": "2025-10-28T11:48:18.274Z",
    "dateReserved": "2025-04-16T07:20:57.153Z",
    "dateUpdated": "2026-05-11T21:41:15.693Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40037",
      "date": "2026-09-21",
      "epss": "0.00199",
      "percentile": "0.0997"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/video/fbdev/simplefb.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "b1deb39cfd614fb2f278b71011692a8dbf0f05ba",
                    "status": "affected",
                    "version": "92a511a568e44cf11681a2223cae4d576a1a515d",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "b6ff0d8de8452ec0e18e5bd7394c2a23e7ff7353",
                    "status": "affected",
                    "version": "92a511a568e44cf11681a2223cae4d576a1a515d",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "da1bb9135213744e7ec398826c8f2e843de4fb94",
                    "status": "affected",
                    "version": "92a511a568e44cf11681a2223cae4d576a1a515d",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/video/fbdev/simplefb.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.8"
                  },
                  {
                    "lessThan": "6.8",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.53",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.17.*",
                    "status": "unaffected",
                    "version": "6.17.3",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.18",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "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\u0027s 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..."
          }
        ],
        "id": "CVE-2025-40037",
        "lastModified": "2026-06-17T09:21:09.600",
        "metrics": {},
        "published": "2025-10-28T12:15:37.613",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b1deb39cfd614fb2f278b71011692a8dbf0f05ba"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b6ff0d8de8452ec0e18e5bd7394c2a23e7ff7353"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/da1bb9135213744e7ec398826c8f2e843de4fb94"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T10:27:50+00:00",
      "cve": "CVE-2025-40037",
      "id": "CVE-2025-40037",
      "initial_release_date": "2025-10-28T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fbdev: simplefb: Fix use after free in simplefb_detach_genpds()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40037.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.