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CVE-2026-31562

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

drm/mediatek: dsi: Store driver data before invoking mipi_dsi_host_register

The call to mipi_dsi_host_register triggers a callback to mtk_dsi_bind, which uses dev_get_drvdata to retrieve the mtk_dsi struct, so this structure needs to be stored inside the driver data before invoking it.

As drvdata is currently uninitialized it leads to a crash when registering the DSI DRM encoder right after acquiring the mode_config.idr_mutex, blocking all subsequent DRM operations.

Fixes the following crash during mediatek-drm probe (tested on Xiaomi Smart Clock x04g):

Detalles técnicos trazas, registros y código del informe original
Unable to handle kernel NULL pointer dereference at virtual address
 0000000000000040
[...]
Modules linked in: mediatek_drm(+) drm_display_helper cec drm_client_lib
 drm_dma_helper drm_kms_helper panel_simple
[...]
Call trace:
 drm_mode_object_add+0x58/0x98 (P)
 __drm_encoder_init+0x48/0x140
 drm_encoder_init+0x6c/0xa0
 drm_simple_encoder_init+0x20/0x34 [drm_kms_helper]
 mtk_dsi_bind+0x34/0x13c [mediatek_drm]
 component_bind_all+0x120/0x280
 mtk_drm_bind+0x284/0x67c [mediatek_drm]
 try_to_bring_up_aggregate_device+0x23c/0x320
 __component_add+0xa4/0x198
 component_add+0x14/0x20
 mtk_dsi_host_attach+0x78/0x100 [mediatek_drm]
 mipi_dsi_attach+0x2c/0x50
 panel_simple_dsi_probe+0x4c/0x9c [panel_simple]
 mipi_dsi_drv_probe+0x1c/0x28
 really_probe+0xc0/0x3dc
 __driver_probe_device+0x80/0x160
 driver_probe_device+0x40/0x120
 __device_attach_driver+0xbc/0x17c
 bus_for_each_drv+0x88/0xf0
 __device_attach+0x9c/0x1cc
 device_initial_probe+0x54/0x60
 bus_probe_device+0x34/0xa0
 device_add+0x5b0/0x800
 mipi_dsi_device_register_full+0xdc/0x16c
 mipi_dsi_host_register+0xc4/0x17c
 mtk_dsi_probe+0x10c/0x260 [mediatek_drm]
 platform_probe+0x5c/0xa4
 really_probe+0xc0/0x3dc
 __driver_probe_device+0x80/0x160
 driver_probe_device+0x40/0x120
 __driver_attach+0xc8/0x1f8
 bus_for_each_dev+0x7c/0xe0
 driver_attach+0x24/0x30
 bus_add_driver+0x11c/0x240
 driver_register+0x68/0x130
 __platform_register_drivers+0x64/0x160
 mtk_drm_init+0x24/0x1000 [mediatek_drm]
 do_one_initcall+0x60/0x1d0
 do_init_module+0x54/0x240
 load_module+0x1838/0x1dc0
 init_module_from_file+0xd8/0xf0
 __arm64_sys_finit_module+0x1b4/0x428
 invoke_syscall.constprop.0+0x48/0xc8
 do_el0_svc+0x3c/0xb8
 el0_svc+0x34/0xe8
 el0t_64_sync_handler+0xa0/0xe4
 el0t_64_sync+0x198/0x19c
Code: 52800022 941004ab 2a0003f3 37f80040 (29005a80)

CVSS

Probabilidad de explotación (EPSS)

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-31562",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
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          "product": "Linux",
          "versions": [
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          "defaultStatus": "unaffected"
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          "programFiles": [
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          "defaultStatus": "affected"
        }
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    }
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  "published": "2026-04-24T15:16:30.610",
  "references": [
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "tags": [
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      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/mediatek: dsi: Store driver data before invoking mipi_dsi_host_register\n\nThe call to mipi_dsi_host_register triggers a callback to mtk_dsi_bind,\nwhich uses dev_get_drvdata to retrieve the mtk_dsi struct, so this\nstructure needs to be stored inside the driver data before invoking it.\n\nAs drvdata is currently uninitialized it leads to a crash when\nregistering the DSI DRM encoder right after acquiring\nthe mode_config.idr_mutex, blocking all subsequent DRM operations.\n\nFixes the following crash during mediatek-drm probe (tested on Xiaomi\nSmart Clock x04g):\n\nUnable to handle kernel NULL pointer dereference at virtual address\n 0000000000000040\n[...]\nModules linked in: mediatek_drm(+) drm_display_helper cec drm_client_lib\n drm_dma_helper drm_kms_helper panel_simple\n[...]\nCall trace:\n drm_mode_object_add+0x58/0x98 (P)\n __drm_encoder_init+0x48/0x140\n drm_encoder_init+0x6c/0xa0\n drm_simple_encoder_init+0x20/0x34 [drm_kms_helper]\n mtk_dsi_bind+0x34/0x13c [mediatek_drm]\n component_bind_all+0x120/0x280\n mtk_drm_bind+0x284/0x67c [mediatek_drm]\n try_to_bring_up_aggregate_device+0x23c/0x320\n __component_add+0xa4/0x198\n component_add+0x14/0x20\n mtk_dsi_host_attach+0x78/0x100 [mediatek_drm]\n mipi_dsi_attach+0x2c/0x50\n panel_simple_dsi_probe+0x4c/0x9c [panel_simple]\n mipi_dsi_drv_probe+0x1c/0x28\n really_probe+0xc0/0x3dc\n __driver_probe_device+0x80/0x160\n driver_probe_device+0x40/0x120\n __device_attach_driver+0xbc/0x17c\n bus_for_each_drv+0x88/0xf0\n __device_attach+0x9c/0x1cc\n device_initial_probe+0x54/0x60\n bus_probe_device+0x34/0xa0\n device_add+0x5b0/0x800\n mipi_dsi_device_register_full+0xdc/0x16c\n mipi_dsi_host_register+0xc4/0x17c\n mtk_dsi_probe+0x10c/0x260 [mediatek_drm]\n platform_probe+0x5c/0xa4\n really_probe+0xc0/0x3dc\n __driver_probe_device+0x80/0x160\n driver_probe_device+0x40/0x120\n __driver_attach+0xc8/0x1f8\n bus_for_each_dev+0x7c/0xe0\n driver_attach+0x24/0x30\n bus_add_driver+0x11c/0x240\n driver_register+0x68/0x130\n __platform_register_drivers+0x64/0x160\n mtk_drm_init+0x24/0x1000 [mediatek_drm]\n do_one_initcall+0x60/0x1d0\n do_init_module+0x54/0x240\n load_module+0x1838/0x1dc0\n init_module_from_file+0xd8/0xf0\n __arm64_sys_finit_module+0x1b4/0x428\n invoke_syscall.constprop.0+0x48/0xc8\n do_el0_svc+0x3c/0xb8\n el0_svc+0x34/0xe8\n el0t_64_sync_handler+0xa0/0xe4\n el0t_64_sync+0x198/0x19c\nCode: 52800022 941004ab 2a0003f3 37f80040 (29005a80)"
    }
  ],
  "lastModified": "2026-06-17T10:33:58.990",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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}