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。

  - iavf修正 free_netdev 中的釋放後使用。我們會對所有已配置的 q_vectors[]進行 netif_napi_add()但可能會對其中部分進行 netif_napi_del()然後 kfree q_vector並將無效的指標留在 dev->napi_list。Reproducer: [root@host ~]# cat repro.sh #!/bin/bash pf_dbsf=0000:41:00.0 vf0_dbsf=0000:41:02.0 g_pids=() function do_set_numvf() { echo 2 >/sys/bus/ pci/devices/${pf_dbsf}/sriov_numvfs sleep $((RANDOM%3+1)) echo 0 >/sys/bus/pci/devices/${pf_dbsf}/sriov_numvfs sleep $((RANDOM%3+1)) } function do_set_channel() { local nic=$(ls -1 --indicator-style=none /sys/bus/pci/devices/${vf0_dbsf}/net/) [ -z $nic ] && { sleep $((RANDOM%3)) ;傳回 1 } ifconfig $nic 192.168.18.5 netmask 255.255.255.0 ifconfig $nic up ethtool -L $nic combine 1 ethtool -L $nic combine 4 sleep $((RANDOM%3)) } function on_exit() { ${g_pids[@]} 中 pid 的本機 pid do kill -0 $pid &>/dev/null && kill $pid &>/dev/null done g_pids=() } 設陷 on_exit;
    時結束 EXIT do do_set_numvf ; done & g_pids+=($!) while do do_set_channel完成 & g_pids+=($!) wait 結果[ 4093.900222] =================================== =============================== [4093.900230] 錯誤KASANfree_netdev+0x308/0x390 中發生釋放後使用[ 4093.900232] 工作 repro.sh/6699 在 addr ffff88b4dc145640 讀取大小 8 [ 4093.900233] [ 4093.900236] CPU10 PID 6699 Commrepro.sh Kdump已載入 污染GO ------- -- -t - 4.18.0 #1 [ 4093.900238] 硬體名稱Power leader PR2008AL/H12DSi-N6、BIOS 2.0 2021 年 4 月 9 日 [ 4093.900239] 呼叫追踪 [ 4093.900244] dump_stack+0x71/0xab [4093.900249] print_address_description +0x6b/0x290 [ 4093.900251] ? free_netdev+0x308/0x390 [ 4093.900252] kasan_report+0x14a/0x2b0 [ 4093.900254] free_netdev+0x308/0x390 [ 4093.900261] iavf_remove+0x825/0xd20 [iavf] [ 4093.900265] pci_device_remove+0xa8/0x1f0 [ 4093.900268] device_release_driver_internal+ 0x1c6/0x460 [ 4093.900271] pci_stop_bus_device+0x101/0x150 [ 4093.900273] pci_stop_and_remove_bus_device+0xe/0x20 [ 4093.900275] pci_iov_remove_virtfn+0x187/0x420 [ 4093.900277] ? pci_iov_add_virtfn+0xe10/0xe10 [ 4093.900278] pci_get_subsys+0x90/0x90 [ 4093.900280] sriov_disable+0xed/0x3e0 [ 4093.900282] ? bus_find_device+0x12d/0x1a0 [ 4093.900290] i40e_free_vfs+0x754/0x1210 [i40e] [ 4093.900298] ? i40e_reset_all_vfs+0x880/0x880 [i40e] [ 4093.900299] ? pci_get_device+0x7c/0x90 [ 4093.900300] ? pci_get_subsys+0x90/0x90 [ 4093.900306] ? pci_vfs_assigned.part.7+0x144/0x210 [ 4093.900309] __mutex_lock_slowpath+0x10/0x10 [ 4093.900315] i40e_pci_sriov_configure+0x1fa/0x2e0 [i40e] [ 4093.900318] sriov_numvfs_store+0x214/0x290 [ 4093.900320] ? sriov_totalvfs_show+0x30/0x30 [ 4093.900321] ? __mutex_lock_slowpath+0x10/0x10 [ 4093.900323] ?
    __check_object_size+0x15a/0x350 [ 4093.900326] kernfs_fop_write+0x280/0x3f0 [ 4093.900329] vfs_write+0x145/0x440 [ 4093.900330] ksys_write+0xab/0x160 [ 4093.900332] ? __ia32_sys_read+0xb0/0xb0 [4093.900334] ? fput_many+0x1a/0x120 [ 4093.900335] ? filp_close+0xf0/0x130 [ 4093.900338] do_syscall_64+0xa0/0x370 [ 4093.900339] ? page_fault+0x8/0x30 [ 4093.900341] entry_SYSCALL_64_after_hwframe+0x65/0xca [ 4093.900357] RIP 0033:0x7f16ad4d22c0 [ 4093.900359] 代碼73 01 c3 48 8b 0d d8 cb 2c 00 f7 d8 64 89 01 48 83 c8 ff c 0f 1f 44 00 00 83 3d 89 24 2d 00 00 75 10 b8 01 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 fe dd 01 00 48 89 04 24 [ 4093.900360] RSP
    002b:00007ffd6491b7f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 4093.900362] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f16ad4d22c0 [ 4093.900363] RDX: 0000000000000002 RSI: 0000000001a41408 RDI: 0000000000000001 [ 4093.900364] RBP: 0000000001a41408 R08: 00007f16ad7a1780 R09: 00007f16ae1f2700 [4093.9003 ---truncated--- (CVE-2023-53556)

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-2023-53556

high Nessus Plugin ID 269311

版本 1.3