Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - drm/meson在聚合驱动程序解除绑定时间时删除 drm 桥未在模块卸载时手动删除 meson_encoder_hdmi_init 和 meson_encoder_cvbs_init 添加的 drm 桥造成对已释放内存的悬摆引用在全局 bridge_list 中保持链接状态。当重新加载驱动程序模块时相同的函数将再次调用 drm_bridge_add当遍历全局 bridge_list 时最终会查看已释放的内存。KASAN 再次揭示问题 [ +0.000095] ====================================== ======================= [ +0.000008] 缺陷KASAN中的释放后使用
    __list_add_valid+0x9c/0x120 [ +0.000018] 通过任务 modprobe/2483 在 addr ffff00003da291f0 进行大小 8 的读取 [+0.000018] CPU: 3 PID: 2483 Comm: modprobe 被污染: GCO 5.19.0-rc6-lrmbkasan+ #1 [ +0.000011] 硬件名称：Hardkernel ODROMID-N2Plus (DT) [ +0.000008] 调用跟踪[ +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 [component_dw_hdmi] [0.000014d +bin_hdmi] +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+0x39c/0x39c [ +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] real_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] 由任务 879 分配[ +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--- (CVE-2022-50256)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且廠商未提供可用的修補程式。

  - drm/meson在驅動程式解除系結匯總時移除 drm 橋接器 meson_encoder_hdmi_init 和 meson_encoder_cvbs_init 新增的 drm 橋接器在模組卸載時未手動移除這造成已釋放記憶體的懸置參照在全域 bridge_list 中保持連結。重新載入驅動程式模組時相同函式會再次呼叫 drm_bridge_add而在遊走全域 bridge_list 時最終會查看已釋放的記憶體。KASAN 再次揭露了問題[ +0.000095] ====================================== ======================= [ +0.000008] 錯誤KASAN在 中釋放後使用
    __list_add_valid+0x9c/0x120 [ +0.000018] 工作 modprobe/2483 在 addr ffff00003da291f0 讀取大小為 8 [+0.000018] CPU: 3 PID: 2483 Commmodprobe 受污染的 GCO 5.19.0-rc6-lrmbkasan+ #1 [ +0.000011] 硬體名稱Hardkernel ODROID-N2Plus (DT) [ +0.000008] 呼叫追踪 [ +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] [meson_dw_hdmi] [0.000014+ ] 元件+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/x390 [ +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] emerge_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] 由工作 879 分配[ +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--- (CVE-2022-50256)

請注意，Nessus 的判定取決於廠商所報告的套件是否存在。

Linux/Unix ホストには、ベンダーが提供するパッチが利用できない脆弱性の影響を受ける複数のパッケージがインストールされています。

  - drm/mesonアグリゲートドライバーのバインド解除時に、drm ブリッジを削除します。meson_encoder_hdmi_init および meson_encoder_cvbs_init により追加された drm ブリッジは、モジュールのアンロード時に手動で削除されませんでした。これにより、解放されたメモリへのダングリング参照が、グローバル bridge_list にリンクされたままになります。ドライバーモジュールを戻してロードする際、同じ関数が再び drm_bridge_add を呼び出し、グローバル bridge_list をトラバースする際、解放されたメモリをピークすることになります。もう一度 KASAN 氏が問題を明らかにしました [+0.000095] ============================================= ================================= [+0.000008] バグ KASANuse-after-free での use-after-free
    __list_add_valid+0x9c/0x120 [+0.000018] タスク modprobe/2483 による addr ffff00003da291f0 でのサイズ 8 の読み取り [+0.000018] CPU3 PID2483 通信modprobe TaintedGCO 5.19.0-rc6-lrmbkasan+ #1 [+0.000011] ハードウェア名Hardkernel ODROID-N2Plus (DT) [+0.000008] トレースの呼び出し[ +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] コンポーネント []_bind0.000014+0x174/0x520 [+0.000012] content_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+0x3856 [+0.000010] object_master_add_with_match+0x1c8/0x284 [+0.000009] meson_drv_probe+0x274/0x280 [meson_drm] [+0.000026] platform_probe+0xd0/0x220 [+0.000009] true_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] load1_module+0x1a7 [8/08008/]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+0x68/0x1a00000000000000000 +0.000012] el0t_64_sync_handler+0x11c/0x150 [+0.000008] el0t_64_sync+0x18c/0x190 [+0.000016] タスク 879 により割り当てられています [ +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+0x5b [] +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 [+0.000008do_el0_sv [xel00000000000000000000000000000000000000000000 +0.000007] el0_svc+0x68/0x1a0 [+0.000009] el0t_64_sync_handler+0x11c/0x150 [+0.000009] el0t_64 ---truncated---CVE-2022-50256]

Nessus は、ベンダーによって報告されたパッケージの存在に依存していることに注意してください。

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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--- (CVE-2022-50256)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Published	Updated	Severity
264914	Linux Distros 未修补的漏洞：CVE-2022-50256	Nessus	Misc.	9/16/2025	8/15/2026	high
264914	Linux Distros 未修補的弱點：CVE-2022-50256	Nessus	Misc.	9/16/2025	8/15/2026	high
264914	Linux Distros のパッチ未適用の脆弱性: CVE-2022-50256	Nessus	Misc.	9/16/2025	8/15/2026	high
264914	Linux Distros Unpatched Vulnerability : CVE-2022-50256	Nessus	Misc.	9/16/2025	8/15/2026	high

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