CVE-2026-31562 (GCVE-0-2026-31562)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:35 – Updated: 2026-04-24 14:35
VLAI?
Title
drm/mediatek: dsi: Store driver data before invoking mipi_dsi_host_register
Summary
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): 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)
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e4732b590a77318dff134612b013d66d2448ab20 , < 9a709b7e36324dfc1e6728eb81405470b7ae84e5 (git)
Affected: e4732b590a77318dff134612b013d66d2448ab20 , < df03f5ac1eae7c5a2c01846e3e64dfc2870eec6b (git)
Affected: e4732b590a77318dff134612b013d66d2448ab20 , < 4cfdfeb6ac06079f92fccd977fa742d6c5b8dd3a (git)
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    Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/mediatek/mtk_dsi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9a709b7e36324dfc1e6728eb81405470b7ae84e5",
              "status": "affected",
              "version": "e4732b590a77318dff134612b013d66d2448ab20",
              "versionType": "git"
            },
            {
              "lessThan": "df03f5ac1eae7c5a2c01846e3e64dfc2870eec6b",
              "status": "affected",
              "version": "e4732b590a77318dff134612b013d66d2448ab20",
              "versionType": "git"
            },
            {
              "lessThan": "4cfdfeb6ac06079f92fccd977fa742d6c5b8dd3a",
              "status": "affected",
              "version": "e4732b590a77318dff134612b013d66d2448ab20",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/mediatek/mtk_dsi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.21",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.11",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T14:35:43.950Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9a709b7e36324dfc1e6728eb81405470b7ae84e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/df03f5ac1eae7c5a2c01846e3e64dfc2870eec6b"
        },
        {
          "url": "https://git.kernel.org/stable/c/4cfdfeb6ac06079f92fccd977fa742d6c5b8dd3a"
        }
      ],
      "title": "drm/mediatek: dsi: Store driver data before invoking mipi_dsi_host_register",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31562",
    "datePublished": "2026-04-24T14:35:43.950Z",
    "dateReserved": "2026-03-09T15:48:24.116Z",
    "dateUpdated": "2026-04-24T14:35:43.950Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31562",
      "date": "2026-04-25",
      "epss": "0.00017",
      "percentile": "0.04073"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31562\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:30.610\",\"lastModified\":\"2026-04-24T17:51:40.810\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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)\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4cfdfeb6ac06079f92fccd977fa742d6c5b8dd3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9a709b7e36324dfc1e6728eb81405470b7ae84e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df03f5ac1eae7c5a2c01846e3e64dfc2870eec6b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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