{"id":"CVE-2022-50256","summary":"drm/meson: remove drm bridges at aggregate driver unbind time","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/meson: remove drm bridges at aggregate driver unbind time\n\ndrm bridges added by meson_encoder_hdmi_init and meson_encoder_cvbs_init\nwere not manually removed at module unload time, which caused dangling\nreferences to freed memory to remain linked in the global bridge_list.\n\nWhen loading the driver modules back in, the same functions would again\ncall drm_bridge_add, and when traversing the global bridge_list, would\nend up peeking into freed memory.\n\nOnce again KASAN revealed the problem:\n\n[  +0.000095] =============================================================\n[  +0.000008] BUG: KASAN: use-after-free in __list_add_valid+0x9c/0x120\n[  +0.000018] Read of size 8 at addr ffff00003da291f0 by task modprobe/2483\n\n[  +0.000018] CPU: 3 PID: 2483 Comm: modprobe Tainted: G         C O      5.19.0-rc6-lrmbkasan+ #1\n[  +0.000011] Hardware name: Hardkernel ODROID-N2Plus (DT)\n[  +0.000008] Call trace:\n[  +0.000006]  dump_backtrace+0x1ec/0x280\n[  +0.000012]  show_stack+0x24/0x80\n[  +0.000008]  dump_stack_lvl+0x98/0xd4\n[  +0.000011]  print_address_description.constprop.0+0x80/0x520\n[  +0.000011]  print_report+0x128/0x260\n[  +0.000008]  kasan_report+0xb8/0xfc\n[  +0.000008]  __asan_report_load8_noabort+0x3c/0x50\n[  +0.000009]  __list_add_valid+0x9c/0x120\n[  +0.000009]  drm_bridge_add+0x6c/0x104 [drm]\n[  +0.000165]  dw_hdmi_probe+0x1900/0x2360 [dw_hdmi]\n[  +0.000022]  meson_dw_hdmi_bind+0x520/0x814 [meson_dw_hdmi]\n[  +0.000014]  component_bind+0x174/0x520\n[  +0.000012]  component_bind_all+0x1a8/0x38c\n[  +0.000010]  meson_drv_bind_master+0x5e8/0xb74 [meson_drm]\n[  +0.000032]  meson_drv_bind+0x20/0x2c [meson_drm]\n[  +0.000027]  try_to_bring_up_aggregate_device+0x19c/0x390\n[  +0.000010]  component_master_add_with_match+0x1c8/0x284\n[  +0.000009]  meson_drv_probe+0x274/0x280 [meson_drm]\n[  +0.000026]  platform_probe+0xd0/0x220\n[  +0.000009]  really_probe+0x3ac/0xa80\n[  +0.000009]  __driver_probe_device+0x1f8/0x400\n[  +0.000009]  driver_probe_device+0x68/0x1b0\n[  +0.000009]  __driver_attach+0x20c/0x480\n[  +0.000008]  bus_for_each_dev+0x114/0x1b0\n[  +0.000009]  driver_attach+0x48/0x64\n[  +0.000008]  bus_add_driver+0x390/0x564\n[  +0.000009]  driver_register+0x1a8/0x3e4\n[  +0.000009]  __platform_driver_register+0x6c/0x94\n[  +0.000008]  meson_drm_platform_driver_init+0x3c/0x1000 [meson_drm]\n[  +0.000027]  do_one_initcall+0xc4/0x2b0\n[  +0.000011]  do_init_module+0x154/0x570\n[  +0.000011]  load_module+0x1a78/0x1ea4\n[  +0.000008]  __do_sys_init_module+0x184/0x1cc\n[  +0.000009]  __arm64_sys_init_module+0x78/0xb0\n[  +0.000009]  invoke_syscall+0x74/0x260\n[  +0.000009]  el0_svc_common.constprop.0+0xcc/0x260\n[  +0.000008]  do_el0_svc+0x50/0x70\n[  +0.000007]  el0_svc+0x68/0x1a0\n[  +0.000012]  el0t_64_sync_handler+0x11c/0x150\n[  +0.000008]  el0t_64_sync+0x18c/0x190\n\n[  +0.000016] Allocated by task 879:\n[  +0.000008]  kasan_save_stack+0x2c/0x5c\n[  +0.000011]  __kasan_kmalloc+0x90/0xd0\n[  +0.000007]  __kmalloc+0x278/0x4a0\n[  +0.000011]  mpi_resize+0x13c/0x1d0\n[  +0.000011]  mpi_powm+0xd24/0x1570\n[  +0.000009]  rsa_enc+0x1a4/0x30c\n[  +0.000009]  pkcs1pad_verify+0x3f0/0x580\n[  +0.000009]  public_key_verify_signature+0x7a8/0xba4\n[  +0.000010]  public_key_verify_signature_2+0x40/0x60\n[  +0.000008]  verify_signature+0xb4/0x114\n[  +0.000008]  pkcs7_validate_trust_one.constprop.0+0x3b8/0x574\n[  +0.000009]  pkcs7_validate_trust+0xb8/0x15c\n[  +0.000008]  verify_pkcs7_message_sig+0xec/0x1b0\n[  +0.000012]  verify_pkcs7_signature+0x78/0xac\n[  +0.000007]  mod_verify_sig+0x110/0x190\n[  +0.000009]  module_sig_check+0x114/0x1e0\n[  +0.000009]  load_module+0xa0/0x1ea4\n[  +0.000008]  __do_sys_init_module+0x184/0x1cc\n[  +0.000008]  __arm64_sys_init_module+0x78/0xb0\n[  +0.000008]  invoke_syscall+0x74/0x260\n[  +0.000009]  el0_svc_common.constprop.0+0x1a8/0x260\n[  +0.000008]  do_el0_svc+0x50/0x70\n[  +0.000007]  el0_svc+0x68/0x1a0\n[  +0.000009]  el0t_64_sync_handler+0x11c/0x150\n[  +0.000009]  el0t_64\n---truncated---","modified":"2026-08-17T03:36:08.673884152Z","published":"2025-09-15T14:02:39.052Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50256.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/09847723c12fc2753749cec3939a02ee92dac468"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de2b6ebe0cb7746b5b6b35d79e150d934392b958"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fc1fd114dde3d2623ac37676df3d74ffeedb0da8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50256.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50256"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e67f6037ae1be34b2b686bab72caa41d57714534"},{"fixed":"de2b6ebe0cb7746b5b6b35d79e150d934392b958"},{"fixed":"fc1fd114dde3d2623ac37676df3d74ffeedb0da8"},{"fixed":"09847723c12fc2753749cec3939a02ee92dac468"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"1c5439a716122cd86530d261cd1bf7ba43b3cdd8"},{"last_affected":"7e88f6d40f5875212f9d9ee8ba19147159908d4a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.33"},{"fixed":"5.16"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.16.19"},{"fixed":"5.17"}]}],"versions":["v5.15.32","v5.16.18","v5.16.17","v5.15.31","v5.16.16","v5.15.30","v5.16.15","v5.15.29","v5.16.14","v5.15.28","v5.16.13","v5.15.27","v5.16.12","v5.15.26","v5.16","v5.16.11","v5.15.25","v5.16.10","v5.15.24","v5.16.9","v5.15.23","v5.16.8","v5.15.22","v5.16.7","v5.15.21","v5.16.6","v5.15.20","v5.16.5","v5.15.19","v5.16.4","v5.15.18","v5.16.3","v5.15.17","v5.16.2","v5.15.16","v5.15.15","v5.16.1","v5.16-rc1","v5.15.14","v5.16-rc8","v5.15.13","v5.16-rc5","v5.16-rc6","v5.15.12","v5.16-rc7","v5.15.11","v5.16-rc3","v5.16-rc2","v5.15.10","v5.15.9","v5.16-rc4","v5.15.8","v5.15.7","v5.15","v5.15.6","v5.15.5","v5.15.4","v5.15.3","v5.15.2","v5.15.1","v5.15-rc2","v5.15-rc1","v5.15-rc4","v5.15-rc7","v5.15-rc3","v5.15-rc5","v5.15-rc6","v5.14","v5.14-rc3","v5.14-rc1","v5.14-rc2","v5.14-rc7","v5.14-rc6","v5.13-rc1","v5.14-rc5","v5.14-rc4","v5.13","v5.13-rc6","v5.13-rc7","v5.13-rc3","v5.13-rc2","v5.13-rc4","v5.13-rc5","v5.12","v5.12-rc2","v5.12-rc1-dontuse","v5.12-rc1","v5.12-rc8","v5.12-rc3","v5.12-rc7","v5.12-rc5","v5.12-rc6","v5.12-rc4","v5.10","v5.11","v5.11-rc3","v5.11-rc7","v5.11-rc6","v5.11-rc5","v5.11-rc1","v5.11-rc4","v5.11-rc2","v5.10-rc1","v5.10-rc7","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v5.10-rc2","v5.10-rc5","v5.9-rc1","v5.9-rc7","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.9-rc3","v5.9-rc2","v5.8","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v5.8-rc5","v5.8-rc3","v5.8-rc4","v5.8-rc6","v5.7-rc4","v5.7-rc7","v5.7-rc1","v5.7-rc3","v5.7-rc2","v5.7-rc5","v5.7-rc6","v5.6","v5.6-rc1","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.5","v5.5-rc5","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4","v5.5-rc4","v5.5-rc3","v5.5-rc6","v5.4-rc1","v5.4-rc6","v5.4-rc3","v5.4-rc4","v5.4-rc8","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v5.3-rc5","v5.3-rc1","v5.3-rc2","v5.3-rc3","v5.3-rc8","v5.3-rc7","v5.3-rc4","v5.2","v5.3-rc6","v5.2-rc2","v5.2-rc7","v5.2-rc4","v5.2-rc1","v5.2-rc5","v5.2-rc6","v5.2-rc3","v5.1","v5.0-rc8","v5.1-rc7","v5.1-rc1","v5.1-rc6","v5.1-rc5","v5.0","v5.1-rc3","v5.1-rc2","v5.1-rc4","v5.0-rc1","v5.0-rc4","v5.0-rc3","v5.0-rc6","v5.0-rc7","v5.0-rc2","v5.0-rc5","v4.20-rc1","v4.19","v4.20","v4.20-rc7","v4.20-rc5","v4.20-rc6","v4.20-rc4","v4.20-rc2","v4.20-rc3","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.19-rc1","v4.19-rc7","v4.19-rc6","v4.19-rc5","v4.19-rc3","v4.18","v4.18-rc1","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.18-rc6","v4.18-rc7","v4.17","v4.18-rc3","v4.18-rc4","v4.17-rc1","v4.17-rc2","v4.17-rc7","v4.17-rc3","v4.17-rc4","v4.16","v4.17-rc6","v4.17-rc5","v4.16-rc7","v4.16-rc4","v4.16-rc1","v4.16-rc2","v4.16-rc5","v4.16-rc3","v4.16-rc6","v4.14","v4.15","v4.15-rc1","v4.15-rc4","v4.15-rc9","v4.15-rc8","v4.15-rc7","v4.15-rc3","v4.15-rc2","v4.15-rc5","v4.15-rc6","v4.14-rc1","v4.14-rc7","v4.14-rc3","v4.13","v4.14-rc8","v4.14-rc4","v4.14-rc6","v4.14-rc2","v4.14-rc5","v4.13-rc2","v4.13-rc1","v4.13-rc3","v4.13-rc7","v4.13-rc4","v4.13-rc5","v4.13-rc6","v4.12-rc1","v4.12","v4.12-rc5","v4.12-rc7","v4.12-rc6","v4.12-rc4","v4.12-rc2","v4.12-rc3","v4.11","v4.11-rc1","v4.11-rc6","v4.11-rc8","v4.11-rc7","v4.11-rc3","v4.11-rc5","v4.11-rc2","v4.11-rc4","v4.10","v4.9","v4.10-rc8","v4.10-rc3","v4.10-rc1","v4.10-rc7","v4.10-rc6","v4.10-rc2","v4.10-rc5","v4.10-rc4","v4.9-rc7","v4.9-rc6","v4.9-rc8","v4.9-rc1","v4.9-rc5","v4.9-rc3","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