cve-2021-47338
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2024-11-04 12:03
Severity ?
Summary
fbmem: Do not delete the mode that is still in use
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/087bff9acd2ec6db3f61aceb3224bde90fe0f7f8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0af778269a522c988ef0b4188556aba97fb420cc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/359311b85ebec7c07c3a08ae2f3def946cad33fa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6e76469157d8f240e5dec6f8411aa8d306b1126
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f193509afc7ff37a46862610c93b896044d5b693
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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                "timestamp": "2024-06-12T15:00:51.209603Z",
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "version": "5.4.134",
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              "version": "5.12.19",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbmem: Do not delete the mode that is still in use\n\nThe execution of fb_delete_videomode() is not based on the result of the\nprevious fbcon_mode_deleted(). As a result, the mode is directly deleted,\nregardless of whether it is still in use, which may cause UAF.\n\n==================================================================\nBUG: KASAN: use-after-free in fb_mode_is_equal+0x36e/0x5e0 \\\ndrivers/video/fbdev/core/modedb.c:924\nRead of size 4 at addr ffff88807e0ddb1c by task syz-executor.0/18962\n\nCPU: 2 PID: 18962 Comm: syz-executor.0 Not tainted 5.10.45-rc1+ #3\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ...\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x137/0x1be lib/dump_stack.c:118\n print_address_description+0x6c/0x640 mm/kasan/report.c:385\n __kasan_report mm/kasan/report.c:545 [inline]\n kasan_report+0x13d/0x1e0 mm/kasan/report.c:562\n fb_mode_is_equal+0x36e/0x5e0 drivers/video/fbdev/core/modedb.c:924\n fbcon_mode_deleted+0x16a/0x220 drivers/video/fbdev/core/fbcon.c:2746\n fb_set_var+0x1e1/0xdb0 drivers/video/fbdev/core/fbmem.c:975\n do_fb_ioctl+0x4d9/0x6e0 drivers/video/fbdev/core/fbmem.c:1108\n vfs_ioctl fs/ioctl.c:48 [inline]\n __do_sys_ioctl fs/ioctl.c:753 [inline]\n __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739\n do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nFreed by task 18960:\n kasan_save_stack mm/kasan/common.c:48 [inline]\n kasan_set_track+0x3d/0x70 mm/kasan/common.c:56\n kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355\n __kasan_slab_free+0x108/0x140 mm/kasan/common.c:422\n slab_free_hook mm/slub.c:1541 [inline]\n slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1574\n slab_free mm/slub.c:3139 [inline]\n kfree+0xca/0x3d0 mm/slub.c:4121\n fb_delete_videomode+0x56a/0x820 drivers/video/fbdev/core/modedb.c:1104\n fb_set_var+0x1f3/0xdb0 drivers/video/fbdev/core/fbmem.c:978\n do_fb_ioctl+0x4d9/0x6e0 drivers/video/fbdev/core/fbmem.c:1108\n vfs_ioctl fs/ioctl.c:48 [inline]\n __do_sys_ioctl fs/ioctl.c:753 [inline]\n __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739\n do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46\n entry_SYSCALL_64_after_hwframe+0x44/0xa9"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "fbmem: Do not delete the mode that is still in use",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47338",
    "datePublished": "2024-05-21T14:35:47.028Z",
    "dateReserved": "2024-05-21T14:28:16.978Z",
    "dateUpdated": "2024-11-04T12:03:58.258Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47338\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:20.610\",\"lastModified\":\"2024-05-21T16:54:26.047\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfbmem: Do not delete the mode that is still in use\\n\\nThe execution of fb_delete_videomode() is not based on the result of the\\nprevious fbcon_mode_deleted(). As a result, the mode is directly deleted,\\nregardless of whether it is still in use, which may cause UAF.\\n\\n==================================================================\\nBUG: KASAN: use-after-free in fb_mode_is_equal+0x36e/0x5e0 \\\\\\ndrivers/video/fbdev/core/modedb.c:924\\nRead of size 4 at addr ffff88807e0ddb1c by task syz-executor.0/18962\\n\\nCPU: 2 PID: 18962 Comm: syz-executor.0 Not tainted 5.10.45-rc1+ #3\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ...\\nCall Trace:\\n __dump_stack lib/dump_stack.c:77 [inline]\\n dump_stack+0x137/0x1be lib/dump_stack.c:118\\n print_address_description+0x6c/0x640 mm/kasan/report.c:385\\n __kasan_report mm/kasan/report.c:545 [inline]\\n kasan_report+0x13d/0x1e0 mm/kasan/report.c:562\\n fb_mode_is_equal+0x36e/0x5e0 drivers/video/fbdev/core/modedb.c:924\\n fbcon_mode_deleted+0x16a/0x220 drivers/video/fbdev/core/fbcon.c:2746\\n fb_set_var+0x1e1/0xdb0 drivers/video/fbdev/core/fbmem.c:975\\n do_fb_ioctl+0x4d9/0x6e0 drivers/video/fbdev/core/fbmem.c:1108\\n vfs_ioctl fs/ioctl.c:48 [inline]\\n __do_sys_ioctl fs/ioctl.c:753 [inline]\\n __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739\\n do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46\\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\\n\\nFreed by task 18960:\\n kasan_save_stack mm/kasan/common.c:48 [inline]\\n kasan_set_track+0x3d/0x70 mm/kasan/common.c:56\\n kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355\\n __kasan_slab_free+0x108/0x140 mm/kasan/common.c:422\\n slab_free_hook mm/slub.c:1541 [inline]\\n slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1574\\n slab_free mm/slub.c:3139 [inline]\\n kfree+0xca/0x3d0 mm/slub.c:4121\\n fb_delete_videomode+0x56a/0x820 drivers/video/fbdev/core/modedb.c:1104\\n fb_set_var+0x1f3/0xdb0 drivers/video/fbdev/core/fbmem.c:978\\n do_fb_ioctl+0x4d9/0x6e0 drivers/video/fbdev/core/fbmem.c:1108\\n vfs_ioctl fs/ioctl.c:48 [inline]\\n __do_sys_ioctl fs/ioctl.c:753 [inline]\\n __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739\\n do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46\\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: fbmem: No elimina el modo que a\u00fan est\u00e1 en uso. La ejecuci\u00f3n de fb_delete_videomode() no se basa en el resultado del fbcon_mode_deleted() anterior. Como resultado, el modo se elimina directamente, independientemente de si todav\u00eda est\u00e1 en uso, lo que puede causar UAF. ==================================================== ================ BUG: KASAN: use-after-free en fb_mode_is_equal+0x36e/0x5e0 \\\\ drivers/video/fbdev/core/modedb.c:924 Lectura de tama\u00f1o 4 en addr ffff88807e0ddb1c por tarea syz-executor.0/18962 CPU: 2 PID: 18962 Comm: syz-executor.0 No contaminado 5.10.45-rc1+ #3 Nombre de hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS .. Seguimiento de llamadas: __dump_stack lib/dump_stack.c:77 [en l\u00ednea] dump_stack+0x137/0x1be lib/dump_stack.c:118 print_address_description+0x6c/0x640 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c: 545 [en l\u00ednea] kasan_report+0x13d/0x1e0 mm/kasan/report.c:562 fb_mode_is_equal+0x36e/0x5e0 drivers/video/fbdev/core/modedb.c:924 fbcon_mode_deleted+0x16a/0x220 drivers/video/fbdev/core/fbcon .c:2746 fb_set_var+0x1e1/0xdb0 drivers/video/fbdev/core/fbmem.c:975 do_fb_ioctl+0x4d9/0x6e0 drivers/video/fbdev/core/fbmem.c:1108 vfs_ioctl fs/ioctl.c:48 [en l\u00ednea ] __do_sys_ioctl fs/ioctl.c:753 [en l\u00ednea] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 Entry_SYSCALL_64_after_hwframe+0x44/0xa9 Liberado por tarea 18960: kasan_save_stack mm/kasan/common.c:48 [en l\u00ednea] kasan_set_track+0x3d/0x70 mm/kasan/common.c:56 kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0x108/0x140 mm/kasan/ common.c:422 slab_free_hook mm/slub.c:1541 [en l\u00ednea] slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1574 slab_free mm/slub.c:3139 [en l\u00ednea] kfree+0xca/0x3d0 mm/slub.c: 4121 fb_delete_videomode+0x56a/0x820 controladores/video/fbdev/core/modedb.c:1104 fb_set_var+0x1f3/0xdb0 controladores/video/fbdev/core/fbmem.c:978 do_fb_ioctl+0x4d9/0x6e0 controladores/video/fbdev/core/ fbmem.c:1108 vfs_ioctl fs/ioctl.c:48 [en l\u00ednea] __do_sys_ioctl fs/ioctl.c:753 [en l\u00ednea] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/ common.c:46 entrada_SYSCALL_64_after_hwframe+0x44/0xa9\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/087bff9acd2ec6db3f61aceb3224bde90fe0f7f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0af778269a522c988ef0b4188556aba97fb420cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/359311b85ebec7c07c3a08ae2f3def946cad33fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d6e76469157d8f240e5dec6f8411aa8d306b1126\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f193509afc7ff37a46862610c93b896044d5b693\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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