CVE-2025-38214 (GCVE-0-2025-38214)
Vulnerability from cvelistv5
Published
2025-07-04 13:37
Modified
2025-07-28 04:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fbdev: Fix fb_set_var to prevent null-ptr-deref in fb_videomode_to_var If fb_add_videomode() in fb_set_var() fails to allocate memory for fb_videomode, later it may lead to a null-ptr dereference in fb_videomode_to_var(), as the fb_info is registered while not having the mode in modelist that is expected to be there, i.e. the one that is described in fb_info->var. ================================================================ general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 PID: 30371 Comm: syz-executor.1 Not tainted 5.10.226-syzkaller #0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:fb_videomode_to_var+0x24/0x610 drivers/video/fbdev/core/modedb.c:901 Call Trace: display_to_var+0x3a/0x7c0 drivers/video/fbdev/core/fbcon.c:929 fbcon_resize+0x3e2/0x8f0 drivers/video/fbdev/core/fbcon.c:2071 resize_screen drivers/tty/vt/vt.c:1176 [inline] vc_do_resize+0x53a/0x1170 drivers/tty/vt/vt.c:1263 fbcon_modechanged+0x3ac/0x6e0 drivers/video/fbdev/core/fbcon.c:2720 fbcon_update_vcs+0x43/0x60 drivers/video/fbdev/core/fbcon.c:2776 do_fb_ioctl+0x6d2/0x740 drivers/video/fbdev/core/fbmem.c:1128 fb_ioctl+0xe7/0x150 drivers/video/fbdev/core/fbmem.c:1203 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 ================================================================ The reason is that fb_info->var is being modified in fb_set_var(), and then fb_videomode_to_var() is called. If it fails to add the mode to fb_info->modelist, fb_set_var() returns error, but does not restore the old value of fb_info->var. Restore fb_info->var on failure the same way it is done earlier in the function. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: Fix fb_set_var to prevent null-ptr-deref in fb_videomode_to_var\n\nIf fb_add_videomode() in fb_set_var() fails to allocate memory for\nfb_videomode, later it may lead to a null-ptr dereference in\nfb_videomode_to_var(), as the fb_info is registered while not having the\nmode in modelist that is expected to be there, i.e. the one that is\ndescribed in fb_info-\u003evar.\n\n================================================================\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\nCPU: 1 PID: 30371 Comm: syz-executor.1 Not tainted 5.10.226-syzkaller #0\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014\nRIP: 0010:fb_videomode_to_var+0x24/0x610 drivers/video/fbdev/core/modedb.c:901\nCall Trace:\n display_to_var+0x3a/0x7c0 drivers/video/fbdev/core/fbcon.c:929\n fbcon_resize+0x3e2/0x8f0 drivers/video/fbdev/core/fbcon.c:2071\n resize_screen drivers/tty/vt/vt.c:1176 [inline]\n vc_do_resize+0x53a/0x1170 drivers/tty/vt/vt.c:1263\n fbcon_modechanged+0x3ac/0x6e0 drivers/video/fbdev/core/fbcon.c:2720\n fbcon_update_vcs+0x43/0x60 drivers/video/fbdev/core/fbcon.c:2776\n do_fb_ioctl+0x6d2/0x740 drivers/video/fbdev/core/fbmem.c:1128\n fb_ioctl+0xe7/0x150 drivers/video/fbdev/core/fbmem.c:1203\n vfs_ioctl fs/ioctl.c:48 [inline]\n __do_sys_ioctl fs/ioctl.c:753 [inline]\n __se_sys_ioctl fs/ioctl.c:739 [inline]\n __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739\n do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46\n entry_SYSCALL_64_after_hwframe+0x67/0xd1\n================================================================\n\nThe reason is that fb_info-\u003evar is being modified in fb_set_var(), and\nthen fb_videomode_to_var() is called. If it fails to add the mode to\nfb_info-\u003emodelist, fb_set_var() returns error, but does not restore the\nold value of fb_info-\u003evar. Restore fb_info-\u003evar on failure the same way\nit is done earlier in the function.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:15:21.767Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ee20216f12d9482cd70e44dae5e7fabb38367c71"
        },
        {
          "url": "https://git.kernel.org/stable/c/fab201d72fde38d081e2c5d4ad25595c535b7b22"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a10d91766eb6ddfd5414e4785611e33a4fe0f9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff0e037241173b574b385bff53d67567b9816db5"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ca78032a388a0795201792b36e6fc9b6e6e8eed"
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          "url": "https://git.kernel.org/stable/c/b3071bb463ea1e6c686d0dc9638fc940f2f5cf17"
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        },
        {
          "url": "https://git.kernel.org/stable/c/05f6e183879d9785a3cdf2f08a498bc31b7a20aa"
        }
      ],
      "title": "fbdev: Fix fb_set_var to prevent null-ptr-deref in fb_videomode_to_var",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38214",
    "datePublished": "2025-07-04T13:37:32.410Z",
    "dateReserved": "2025-04-16T04:51:23.995Z",
    "dateUpdated": "2025-07-28T04:15:21.767Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38214\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-04T14:15:29.843\",\"lastModified\":\"2025-07-08T16:18:53.607\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfbdev: Fix fb_set_var to prevent null-ptr-deref in fb_videomode_to_var\\n\\nIf fb_add_videomode() in fb_set_var() fails to allocate memory for\\nfb_videomode, later it may lead to a null-ptr dereference in\\nfb_videomode_to_var(), as the fb_info is registered while not having the\\nmode in modelist that is expected to be there, i.e. the one that is\\ndescribed in fb_info-\u003evar.\\n\\n================================================================\\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI\\nKASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\\nCPU: 1 PID: 30371 Comm: syz-executor.1 Not tainted 5.10.226-syzkaller #0\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014\\nRIP: 0010:fb_videomode_to_var+0x24/0x610 drivers/video/fbdev/core/modedb.c:901\\nCall Trace:\\n display_to_var+0x3a/0x7c0 drivers/video/fbdev/core/fbcon.c:929\\n fbcon_resize+0x3e2/0x8f0 drivers/video/fbdev/core/fbcon.c:2071\\n resize_screen drivers/tty/vt/vt.c:1176 [inline]\\n vc_do_resize+0x53a/0x1170 drivers/tty/vt/vt.c:1263\\n fbcon_modechanged+0x3ac/0x6e0 drivers/video/fbdev/core/fbcon.c:2720\\n fbcon_update_vcs+0x43/0x60 drivers/video/fbdev/core/fbcon.c:2776\\n do_fb_ioctl+0x6d2/0x740 drivers/video/fbdev/core/fbmem.c:1128\\n fb_ioctl+0xe7/0x150 drivers/video/fbdev/core/fbmem.c:1203\\n vfs_ioctl fs/ioctl.c:48 [inline]\\n __do_sys_ioctl fs/ioctl.c:753 [inline]\\n __se_sys_ioctl fs/ioctl.c:739 [inline]\\n __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739\\n do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46\\n entry_SYSCALL_64_after_hwframe+0x67/0xd1\\n================================================================\\n\\nThe reason is that fb_info-\u003evar is being modified in fb_set_var(), and\\nthen fb_videomode_to_var() is called. If it fails to add the mode to\\nfb_info-\u003emodelist, fb_set_var() returns error, but does not restore the\\nold value of fb_info-\u003evar. Restore fb_info-\u003evar on failure the same way\\nit is done earlier in the function.\\n\\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fbdev: Corregir fb_set_var para evitar la desreferencia null-ptr en fb_videomode_to_var Si fb_add_videomode() en fb_set_var() no puede asignar memoria para fb_videomode, m\u00e1s tarde puede conducir a una desreferencia null-ptr en fb_videomode_to_var(), ya que fb_info se registra sin tener el modo en modelist que se espera que est\u00e9 all\u00ed, es decir, el que se describe en fb_info-\u0026gt;var.\\n================================================================ \\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 PID: 30371 Comm: syz-executor.1 Not tainted 5.10.226-syzkaller #0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:fb_videomode_to_var+0x24/0x610 drivers/video/fbdev/core/modedb.c:901 Call Trace: display_to_var+0x3a/0x7c0 drivers/video/fbdev/core/fbcon.c:929 fbcon_resize+0x3e2/0x8f0 drivers/video/fbdev/core/fbcon.c:2071 resize_screen drivers/tty/vt/vt.c:1176 [inline] vc_do_resize+0x53a/0x1170 drivers/tty/vt/vt.c:1263 fbcon_modechanged+0x3ac/0x6e0 drivers/video/fbdev/core/fbcon.c:2720 fbcon_update_vcs+0x43/0x60 drivers/video/fbdev/core/fbcon.c:2776 do_fb_ioctl+0x6d2/0x740 drivers/video/fbdev/core/fbmem.c:1128 fb_ioctl+0xe7/0x150 drivers/video/fbdev/core/fbmem.c:1203 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 ================================================================ \\nEl motivo es que fb_info-\u0026gt;var se modifica en fb_set_var() y, a continuaci\u00f3n, se llama a fb_videomode_to_var(). Si no se logra agregar el modo a fb_info-\u0026gt;modelist, fb_set_var() devuelve un error, pero no restaura el valor anterior de fb_info-\u0026gt;var. Si falla, restaure fb_info-\u0026gt;var de la misma forma que se hizo anteriormente en la funci\u00f3n. Encontrado por el Centro de Verificaci\u00f3n de Linux (linuxtesting.org) con Syzkaller.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/05f6e183879d9785a3cdf2f08a498bc31b7a20aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1a10d91766eb6ddfd5414e4785611e33a4fe0f9b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ca78032a388a0795201792b36e6fc9b6e6e8eed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8a3a2887794b2c8e78b3e5d6e3de724527c9f41b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3071bb463ea1e6c686d0dc9638fc940f2f5cf17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee20216f12d9482cd70e44dae5e7fabb38367c71\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fab201d72fde38d081e2c5d4ad25595c535b7b22\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff0e037241173b574b385bff53d67567b9816db5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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