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

  - wifi: brcmfmac修正 brcmf_fw_alloc_request() 中潛在的移位超出邊界。此修補程式可修正 brcmfmac 中裝置提供的「chiprev」太大時在 BIT(chiprev) 中發生的移位超出邊界。當我們使用 u32 變數和 BIT(chiprev) 執行位元與運算時其也不應等於或大於 BITS_PER_TYPE(u32)。此修補程式會新增一個檢查可讓函式在此情況下傳回 NULL。
    請注意NULL 情況稍後會由匯流排特定的呼叫端 brcmf_usb_probe_cb() 或 brcmf_usb_reset_resume() 等加以處理。此問題由 syzkaller 的修改版本發現。UBSANdrivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c 中的 shift-out-of-bounds 移位指數 151055786 對於 64 位元類型「long unsigned int」CPU: 0 PID: 1885 Commkworker /0:2 污染GO 5.14.0+ #132 硬體名稱QEMU Standard PC (i440FX + PIIX, 1996)BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org04/01/2014 工作佇列usb_hub_wq hub_event 呼叫Tracedump_stack_lvl+0x57/0x7d ubsan_epilogue+0x5/0x40
    __ubsan_handle_shift_out_of_bounds.cold+0x53/0xdb ? lock_chain_count+0x20/0x20 brcmf_fw_alloc_request.cold+0x19/0x3ea brcmf_fw_get_firmwares+0x250/0x250 ? brcmf_usb_ioctl_resp_wait+0x1a7/0x1f0 brcmf_usb_get_fwname+0x114/0x1a0 brcmf_usb_reset_resume+0x120/0x120 number+0x6c4/0x9a0 brcmf_c_process_clm_blob+0x168/0x590 put_dec+0x90/0x90 ? enable_ptr_key_workfn+0x20/0x20 ? brcmf_common_pd_remove+0x50/0x50 rcu_read_lock_sched_held+0xa1/0xd0 brcmf_c_preinit_dcmds+0x673/0xc40 brcmf_c_set_joinpref_default+0x100/0x100 ? rcu_read_lock_sched_held+0xa1/0xd0 rcu_read_lock_bh_held+0xb0/0xb0 ? lock_acquire+0x19d/0x4e0 find_held_lock+0x2d/0x110 ? brcmf_usb_deq+0x1cc/0x260 mark_held_locks+0x9f/0xe0 lockdep_hardirqs_on_prepare+0x273/0x3e0
    _raw_spin_unlock_irqrestore+0x47/0x50 ? trace_hardirqs_on+0x1c/0x120 ? brcmf_usb_deq+0x1a7/0x260 brcmf_usb_rx_fill_all+0x5a/0xf0 brcmf_attach+0x246/0xd40 wiphy_new_nm+0x1476/0x1d50 kmemdup+0x30/0x40 brcmf_usb_probe+0x12de/0x1690 ? brcmf_usbdev_qinit.constprop.0+0x470/0x470 usb_probe_interface+0x25f/0x710 real_probe+0x1be/0xa90 __driver_probe_device+0x2ab/0x460 usb_match_id.part.0+0x88/0xc0 driver_probe_device+0x49/0x120 __device_attach_driver+0x18a/0x250 driver_allows_async_probing+0x120/0x120 bus_for_each_drv+0x123/0x1a0 bus_rescan_devices+0x20/0x20 lockdep_hardirqs_on_prepare+0x273/0x3e0 trace_hardirqs_on+0x1c/0x120 __device_attach+0x207/0x330 ? device_bind_driver+0xb0/0xb0 ? kobject_uevent_env+0x230/0x12c0 bus_probe_device+0x1a2/0x260 device_add+0xa61/0x1ce0 __mutex_unlock_slowpath+0xe7/0x660 ? __fw_devlink_link_to_suppliers+0x550/0x550 usb_set_configuration+0x984/0x1770 ? kernfs_create_link+0x175/0x230 usb_generic_driver_probe+0x69/0x90 usb_probe_device+0x9c/0x220 Likewise_probe+0x1be/0xa90 __driver_probe_device+0x2ab/0x460 driver_probe_device+0x49/0x120 __device_attach_driver+0x18a/0x2?50 driver_allows_async_probing+0x120/0x120 bus_for_each_drv+0x123/0x1a0 bus_rescan_devices+0x20/0x20 lockdep_hardirqs_on_prepare+0x273/0x3e0 trace_hardirqs_on+0x1c/0x120 __device_attach+0x207/0x330 ? device_bind_driver+0xb0/0xb0 ? kobject_uevent_env+0x230/0x12c0 bus_probe_device+0x1a2/0x260 device_add+0xa61/0x1ce0 __fw_devlink_link_to_suppliers+0x550/0x550 usb_new_device.cold+0x463/0xf66 ? hub_disconnect+0x400/0x400 ? _raw_spin_unlock_irq+0x24/0x30 hub_event+0x10d5/0x3330 ? hub_port_debounce+0x280/0x280 ? __lock_acquire+0x1671/0x5790 ? wq_calc_node_cpumask+0x170/0x2a0 ? lock_release+0x640/0x640 ? rcu_read_lock_sched_held+0xa1/0xd0 rcu_read_lock_bh_held+0xb0/0xb0 ? lockdep_hardirqs_on_prepare+0x273/0x3e0 process_one_work+0x873/0x13e0 lock_release+0x640/0x640 ? pwq_dec_nr_in_flight+0x320/0x320 ? rwlock_bug.part.0+0x90/0x90 worker_thread+0x8b/0xd10 ?
    __kthread_parkme+0xd9/0x1d0 ? pr ---truncated--- (CVE-2022-50551)

請注意，Nessus 的判定取決於廠商所報告的套件是否存在。

偵測

Linux Distros 未修補的弱點：CVE-2022-50551

high Nessus Plugin ID 270169

版本 1.13