CVE-2022-50256 (GCVE-0-2022-50256)
Vulnerability from cvelistv5
Published
2025-09-15 14:02
Modified
2025-09-16 08:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/meson: remove drm bridges at aggregate driver unbind time drm bridges added by meson_encoder_hdmi_init and meson_encoder_cvbs_init were not manually removed at module unload time, which caused dangling references to freed memory to remain linked in the global bridge_list. When loading the driver modules back in, the same functions would again call drm_bridge_add, and when traversing the global bridge_list, would end up peeking into freed memory. Once again KASAN revealed the problem: [ +0.000095] ============================================================= [ +0.000008] BUG: KASAN: use-after-free in __list_add_valid+0x9c/0x120 [ +0.000018] Read of size 8 at addr ffff00003da291f0 by task modprobe/2483 [ +0.000018] CPU: 3 PID: 2483 Comm: modprobe Tainted: G C O 5.19.0-rc6-lrmbkasan+ #1 [ +0.000011] Hardware name: Hardkernel ODROID-N2Plus (DT) [ +0.000008] Call trace: [ +0.000006] dump_backtrace+0x1ec/0x280 [ +0.000012] show_stack+0x24/0x80 [ +0.000008] dump_stack_lvl+0x98/0xd4 [ +0.000011] print_address_description.constprop.0+0x80/0x520 [ +0.000011] print_report+0x128/0x260 [ +0.000008] kasan_report+0xb8/0xfc [ +0.000008] __asan_report_load8_noabort+0x3c/0x50 [ +0.000009] __list_add_valid+0x9c/0x120 [ +0.000009] drm_bridge_add+0x6c/0x104 [drm] [ +0.000165] dw_hdmi_probe+0x1900/0x2360 [dw_hdmi] [ +0.000022] meson_dw_hdmi_bind+0x520/0x814 [meson_dw_hdmi] [ +0.000014] component_bind+0x174/0x520 [ +0.000012] component_bind_all+0x1a8/0x38c [ +0.000010] meson_drv_bind_master+0x5e8/0xb74 [meson_drm] [ +0.000032] meson_drv_bind+0x20/0x2c [meson_drm] [ +0.000027] try_to_bring_up_aggregate_device+0x19c/0x390 [ +0.000010] component_master_add_with_match+0x1c8/0x284 [ +0.000009] meson_drv_probe+0x274/0x280 [meson_drm] [ +0.000026] platform_probe+0xd0/0x220 [ +0.000009] really_probe+0x3ac/0xa80 [ +0.000009] __driver_probe_device+0x1f8/0x400 [ +0.000009] driver_probe_device+0x68/0x1b0 [ +0.000009] __driver_attach+0x20c/0x480 [ +0.000008] bus_for_each_dev+0x114/0x1b0 [ +0.000009] driver_attach+0x48/0x64 [ +0.000008] bus_add_driver+0x390/0x564 [ +0.000009] driver_register+0x1a8/0x3e4 [ +0.000009] __platform_driver_register+0x6c/0x94 [ +0.000008] meson_drm_platform_driver_init+0x3c/0x1000 [meson_drm] [ +0.000027] do_one_initcall+0xc4/0x2b0 [ +0.000011] do_init_module+0x154/0x570 [ +0.000011] load_module+0x1a78/0x1ea4 [ +0.000008] __do_sys_init_module+0x184/0x1cc [ +0.000009] __arm64_sys_init_module+0x78/0xb0 [ +0.000009] invoke_syscall+0x74/0x260 [ +0.000009] el0_svc_common.constprop.0+0xcc/0x260 [ +0.000008] do_el0_svc+0x50/0x70 [ +0.000007] el0_svc+0x68/0x1a0 [ +0.000012] el0t_64_sync_handler+0x11c/0x150 [ +0.000008] el0t_64_sync+0x18c/0x190 [ +0.000016] Allocated by task 879: [ +0.000008] kasan_save_stack+0x2c/0x5c [ +0.000011] __kasan_kmalloc+0x90/0xd0 [ +0.000007] __kmalloc+0x278/0x4a0 [ +0.000011] mpi_resize+0x13c/0x1d0 [ +0.000011] mpi_powm+0xd24/0x1570 [ +0.000009] rsa_enc+0x1a4/0x30c [ +0.000009] pkcs1pad_verify+0x3f0/0x580 [ +0.000009] public_key_verify_signature+0x7a8/0xba4 [ +0.000010] public_key_verify_signature_2+0x40/0x60 [ +0.000008] verify_signature+0xb4/0x114 [ +0.000008] pkcs7_validate_trust_one.constprop.0+0x3b8/0x574 [ +0.000009] pkcs7_validate_trust+0xb8/0x15c [ +0.000008] verify_pkcs7_message_sig+0xec/0x1b0 [ +0.000012] verify_pkcs7_signature+0x78/0xac [ +0.000007] mod_verify_sig+0x110/0x190 [ +0.000009] module_sig_check+0x114/0x1e0 [ +0.000009] load_module+0xa0/0x1ea4 [ +0.000008] __do_sys_init_module+0x184/0x1cc [ +0.000008] __arm64_sys_init_module+0x78/0xb0 [ +0.000008] invoke_syscall+0x74/0x260 [ +0.000009] el0_svc_common.constprop.0+0x1a8/0x260 [ +0.000008] do_el0_svc+0x50/0x70 [ +0.000007] el0_svc+0x68/0x1a0 [ +0.000009] el0t_64_sync_handler+0x11c/0x150 [ +0.000009] el0t_64 ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: bbbe775ec5b5dace43a35886da9924837da09ddd
Version: bbbe775ec5b5dace43a35886da9924837da09ddd
Version: bbbe775ec5b5dace43a35886da9924837da09ddd
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/meson/meson_drv.c",
            "drivers/gpu/drm/meson/meson_drv.h",
            "drivers/gpu/drm/meson/meson_encoder_cvbs.c",
            "drivers/gpu/drm/meson/meson_encoder_cvbs.h",
            "drivers/gpu/drm/meson/meson_encoder_hdmi.c",
            "drivers/gpu/drm/meson/meson_encoder_hdmi.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "de2b6ebe0cb7746b5b6b35d79e150d934392b958",
              "status": "affected",
              "version": "bbbe775ec5b5dace43a35886da9924837da09ddd",
              "versionType": "git"
            },
            {
              "lessThan": "fc1fd114dde3d2623ac37676df3d74ffeedb0da8",
              "status": "affected",
              "version": "bbbe775ec5b5dace43a35886da9924837da09ddd",
              "versionType": "git"
            },
            {
              "lessThan": "09847723c12fc2753749cec3939a02ee92dac468",
              "status": "affected",
              "version": "bbbe775ec5b5dace43a35886da9924837da09ddd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/meson/meson_drv.c",
            "drivers/gpu/drm/meson/meson_drv.h",
            "drivers/gpu/drm/meson/meson_encoder_cvbs.c",
            "drivers/gpu/drm/meson/meson_encoder_cvbs.h",
            "drivers/gpu/drm/meson/meson_encoder_hdmi.c",
            "drivers/gpu/drm/meson/meson_encoder_hdmi.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.17",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.3",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-16T08:02:02.484Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/de2b6ebe0cb7746b5b6b35d79e150d934392b958"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc1fd114dde3d2623ac37676df3d74ffeedb0da8"
        },
        {
          "url": "https://git.kernel.org/stable/c/09847723c12fc2753749cec3939a02ee92dac468"
        }
      ],
      "title": "drm/meson: remove drm bridges at aggregate driver unbind time",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50256",
    "datePublished": "2025-09-15T14:02:39.052Z",
    "dateReserved": "2025-09-15T13:58:00.973Z",
    "dateUpdated": "2025-09-16T08:02:02.484Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50256\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-15T14:15:36.363\",\"lastModified\":\"2025-09-15T15:21:42.937\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/09847723c12fc2753749cec3939a02ee92dac468\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de2b6ebe0cb7746b5b6b35d79e150d934392b958\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc1fd114dde3d2623ac37676df3d74ffeedb0da8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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