CVE-2025-40037

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> fbdev: simplefb: Fix use after free in simplefb_detach_genpds()<br /> <br /> The pm_domain cleanup can not be devres managed as it uses struct<br /> simplefb_par which is allocated within struct fb_info by<br /> framebuffer_alloc(). This allocation is explicitly freed by<br /> unregister_framebuffer() in simplefb_remove().<br /> Devres managed cleanup runs after the device remove call and thus can no<br /> longer access struct simplefb_par.<br /> Call simplefb_detach_genpds() explicitly from simplefb_destroy() like<br /> the cleanup functions for clocks and regulators.<br /> <br /> Fixes an use after free on M2 Mac mini during<br /> aperture_remove_conflicting_devices() using the downstream asahi kernel<br /> with Debian&amp;#39;s kernel config. For unknown reasons this started to<br /> consistently dereference an invalid pointer in v6.16.3 based kernels.<br /> <br /> [ 6.736134] BUG: KASAN: slab-use-after-free in simplefb_detach_genpds+0x58/0x220<br /> [ 6.743545] Read of size 4 at addr ffff8000304743f0 by task (udev-worker)/227<br /> [ 6.750697]<br /> [ 6.752182] CPU: 6 UID: 0 PID: 227 Comm: (udev-worker) Tainted: G S 6.16.3-asahi+ #16 PREEMPTLAZY<br /> [ 6.752186] Tainted: [S]=CPU_OUT_OF_SPEC<br /> [ 6.752187] Hardware name: Apple Mac mini (M2, 2023) (DT)<br /> [ 6.752189] Call trace:<br /> [ 6.752190] show_stack+0x34/0x98 (C)<br /> [ 6.752194] dump_stack_lvl+0x60/0x80<br /> [ 6.752197] print_report+0x17c/0x4d8<br /> [ 6.752201] kasan_report+0xb4/0x100<br /> [ 6.752206] __asan_report_load4_noabort+0x20/0x30<br /> [ 6.752209] simplefb_detach_genpds+0x58/0x220<br /> [ 6.752213] devm_action_release+0x50/0x98<br /> [ 6.752216] release_nodes+0xd0/0x2c8<br /> [ 6.752219] devres_release_all+0xfc/0x178<br /> [ 6.752221] device_unbind_cleanup+0x28/0x168<br /> [ 6.752224] device_release_driver_internal+0x34c/0x470<br /> [ 6.752228] device_release_driver+0x20/0x38<br /> [ 6.752231] bus_remove_device+0x1b0/0x380<br /> [ 6.752234] device_del+0x314/0x820<br /> [ 6.752238] platform_device_del+0x3c/0x1e8<br /> [ 6.752242] platform_device_unregister+0x20/0x50<br /> [ 6.752246] aperture_detach_platform_device+0x1c/0x30<br /> [ 6.752250] aperture_detach_devices+0x16c/0x290<br /> [ 6.752253] aperture_remove_conflicting_devices+0x34/0x50<br /> ...<br /> [ 6.752343]<br /> [ 6.967409] Allocated by task 62:<br /> [ 6.970724] kasan_save_stack+0x3c/0x70<br /> [ 6.974560] kasan_save_track+0x20/0x40<br /> [ 6.978397] kasan_save_alloc_info+0x40/0x58<br /> [ 6.982670] __kasan_kmalloc+0xd4/0xd8<br /> [ 6.986420] __kmalloc_noprof+0x194/0x540<br /> [ 6.990432] framebuffer_alloc+0xc8/0x130<br /> [ 6.994444] simplefb_probe+0x258/0x2378<br /> ...<br /> [ 7.054356]<br /> [ 7.055838] Freed by task 227:<br /> [ 7.058891] kasan_save_stack+0x3c/0x70<br /> [ 7.062727] kasan_save_track+0x20/0x40<br /> [ 7.066565] kasan_save_free_info+0x4c/0x80<br /> [ 7.070751] __kasan_slab_free+0x6c/0xa0<br /> [ 7.074675] kfree+0x10c/0x380<br /> [ 7.077727] framebuffer_release+0x5c/0x90<br /> [ 7.081826] simplefb_destroy+0x1b4/0x2c0<br /> [ 7.085837] put_fb_info+0x98/0x100<br /> [ 7.089326] unregister_framebuffer+0x178/0x320<br /> [ 7.093861] simplefb_remove+0x3c/0x60<br /> [ 7.097611] platform_remove+0x60/0x98<br /> [ 7.101361] device_remove+0xb8/0x160<br /> [ 7.105024] device_release_driver_internal+0x2fc/0x470<br /> [ 7.110256] device_release_driver+0x20/0x38<br /> [ 7.114529] bus_remove_device+0x1b0/0x380<br /> [ 7.118628] device_del+0x314/0x820<br /> [ 7.122116] platform_device_del+0x3c/0x1e8<br /> [ 7.126302] platform_device_unregister+0x20/0x50<br /> [ 7.131012] aperture_detach_platform_device+0x1c/0x30<br /> [ 7.136157] aperture_detach_devices+0x16c/0x290<br /> [ 7.140779] aperture_remove_conflicting_devices+0x34/0x50<br /> ...