{"id":"DEBIAN-CVE-2026-31562","details":"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)","modified":"2026-08-27T23:05:57.079191929Z","published":"2026-04-24T15:16:30.610Z","upstream":["CVE-2026-31562"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-31562"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.10-1","6.18.12-1","6.18.12-1~bpo13+1","6.18.13-1","6.18.14-1","6.18.15-1","6.18.15-1~bpo13+1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1","6.19-1~exp1","6.19.10-1","6.19.10-1~bpo13+1","6.19.11-1","6.19.11-1~bpo13+1","6.19.12-1","6.19.13-1","6.19.13-1~bpo13+1","6.19.14-1","6.19.14-1~bpo13+1","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","6.19.6-1","6.19.6-2","6.19.6-2~bpo13+1","6.19.8-1","6.19.8-1~bpo13+1","6.19~rc4-1~exp1","6.19~rc5-1~exp1","6.19~rc6-1~exp1","6.19~rc7-1~exp1","6.19~rc8-1~exp1","7.0-1~exp1","7.0.1-1~exp1","7.0.10-1","7.0.10-1~bpo13+1","7.0.12-1","7.0.12-2","7.0.12-2~bpo13+1","7.0.13-1","7.0.13-1~bpo13+1","7.0.14-1","7.0.3-1","7.0.4-1","7.0.4-1~bpo13+1","7.0.7-1","7.0.7-1~bpo13+1","7.0.9-1","7.0.9-1~bpo13+1","7.1.1-1~exp1","7.1.10-1","7.1.2-1~exp1","7.1.3-1","7.1.3-1+sunvdc","7.1.3-1~bpo13+1","7.1.4-1","7.1.5-1","7.1.6-1","7.1.7-1","7.1.7-1~bpo13+1","7.1.8-1","7.1.8-1~bpo13+1","7.1.8-2","7.1.9-1","7.1.9-1+sparc64","7.1~rc2-1~exp1","7.1~rc3-1~exp1","7.1~rc4-1~exp1","7.1~rc4-1~exp2","7.1~rc5-1~exp1","7.1~rc7-1~exp1","7.2~rc3-1~exp1","7.2~rc5-1~exp1","7.2~rc7-1~exp1"],"ecosystem_specific":{"urgency":"not yet 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yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-31562.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}