CVE-2025-40037
Estado: AplazadaSin puntuar—
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.
Detalles técnicos trazas, registros y código del informe original
[ 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 ...
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
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{
"id": "CVE-2025-40037",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "92a511a568e44cf11681a2223cae4d576a1a515d",
"lessThan": "b1deb39cfd614fb2f278b71011692a8dbf0f05ba",
"versionType": "git"
},
{
"status": "affected",
"version": "92a511a568e44cf11681a2223cae4d576a1a515d",
"lessThan": "b6ff0d8de8452ec0e18e5bd7394c2a23e7ff7353",
"versionType": "git"
},
{
"status": "affected",
"version": "92a511a568e44cf11681a2223cae4d576a1a515d",
"lessThan": "da1bb9135213744e7ec398826c8f2e843de4fb94",
"versionType": "git"
}
],
"programFiles": [
"drivers/video/fbdev/simplefb.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.53",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.17.3",
"versionType": "semver",
"lessThanOrEqual": "6.17.*"
},
{
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/video/fbdev/simplefb.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-10-28T12:15:37.613",
"references": [
{
"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",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"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'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..."
}
],
"lastModified": "2026-06-17T09:21:09.600",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}