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

Vulnerability from cvelistv5 – Published: 2026-04-24 14:35 – Updated: 2026-05-11 22:11
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e4732b590a77318dff134612b013d66d2448ab20 , < 9a709b7e36324dfc1e6728eb81405470b7ae84e5 (git)
Affected: e4732b590a77318dff134612b013d66d2448ab20 , < df03f5ac1eae7c5a2c01846e3e64dfc2870eec6b (git)
Affected: e4732b590a77318dff134612b013d66d2448ab20 , < 4cfdfeb6ac06079f92fccd977fa742d6c5b8dd3a (git)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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          "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)"
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    "cveId": "CVE-2026-31562",
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    "dateReserved": "2026-03-09T15:48:24.116Z",
    "dateUpdated": "2026-05-11T22:11:11.077Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31562\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:30.610\",\"lastModified\":\"2026-06-17T10:33:58.990\",\"vulnStatus\":\"Analyzed\",\"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 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:52:41+00:00",
      "cve": "CVE-2026-31562",
      "id": "CVE-2026-31562",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/mediatek: dsi: Store driver data before invoking mipi_dsi_host_register",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31562.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:21:41Z",
      "cve": "CVE-2026-31562",
      "id": "CVE-2026-31562",
      "initial_release_date": "2026-04-25T01:39:23Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "298",
      "product_status:recommended": "145",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31562",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31562.json",
      "version": "6"
    }
  }
}



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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.