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。

  - tcpcdg允许多次调用 tcp_cdg_release() 显然 mptcp 能够在已断开连接的流上调用 tcp_disconnect()。除非当前的拥塞控制为 CDG 否则这通常没有问题因为可能触发双重释放 [1] 我们可以使 tcp_disconnect() 更具弹性而不是修复 MPTCP 以及未来的缺陷。 [1] BUGKASAN在 slab_free mm/slub.c:3539 [内联] 中发生双重释放 mm/slub.c:4567 CPU: 0 PID: 3645 Comm kworker/0:7 未受感染 6.0.0-syzkaller-02734-g0326074ff465 #0 硬件名称Google Google Compute Engine/Google Compute Engine、BIOS Google 09/22/2022 Workqueue事件 mptcp_worker 调用跟踪 <TASK> __dump_stack lib/dump_stack。 c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report_invalid_free+0x81 /0x190 mm/kasan/report.c:462____kasan_slab_free+0x18b/0x1c0 mm/kasan/common.c:356 kasan_slab_free include/linux/kasan.h:200 [内联] slab_free_hook mm/slub.c:1759 [内联] slab_free_freelist_hook +0x8b/0x1c0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xe2/0x580 mm/slub.c:4567 tcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145 __mptcp_close_ssk+ 0x5ca/0x7e0 net/mptcp/protocol.c:2327 mptcp_do_fastclose net/mptcp/prot ocol.c:2592 [inline] mptcp_worker+0x78c/0xff0 net/mptcp/protocol.c:2627 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/ 0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> 由任务分配 3671kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/ common.c:45 [内联] set_alloc_info mm/kasan/common.c:437 [内联]____kasan_kmalloc mm/kasan/common.c:516 [内联]____kasan_kmalloc mm/kasan/common.c:475 [内联]
    __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525 kmalloc_array include/linux/slab.h:640 [内联] kcalloc include/linux/slab.h:671 [内联] tcp_cdg_init+0x10d/0x170 net/ipv4/tcp_cdg .c:380 tcp_init_congestion_control+0xab/0x550 net/ipv4/tcp_cong.c:193 tcp_reinit_congestion_control net/ipv4/tcp_cong.c:217 [内联] tcp_set_congestion_control+0x96c/0xaa0 net/ipv4/tcp_cong.c:391 do_tcp_cong.c:391do_tcp_congestion_control+0x96c/0xaa0net/ipv4/tcp_cong.c:391 net/ipv4/tcp.c:3513 tcp_setsockopt+0xd4/0x100 net/ipv4/tcp.c:3801 mptcp_setsockopt+0x35f/0x2570 net/mptcp/sockopt.c:844 __sys_setsockopt+0x2d6/0x690 net/socket.c:2252
    __do_sys_setsockopt net/socket.c:2263 [内联] __se_sys_setsockopt net/socket.c:2260 [内联]
    __x64_sys_setsockopt+0xba/0x150 net/socket.c:2260 do_syscall_x64 arch/x86/entry/common.c:50 [内联] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd 由任务 16kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370____kasan_slab_free mm/kasan/ common.c:367 [内联]
    ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [内联] slab_free_hook mm/slub.c:1759 [内联] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xe2/0x580 mm/slub.c:4567 tcp_cleanup_congestion_control+0x70/0x120 net/ipv4/tcp_cong.c:226 tcp_v4_destroy_sock+0xdd/0x750 net/ipv4/tcp_ipv4.c 2254 tcp_v6_destroy_sock+0x11/0x20 net/ipv6/tcp_ipv6.c:1969 inet_csk_destroy_sock+0x196/0x440 net/ipv4/inet_connection_sock.c:1157 tcp_done+0x23b/0x340 net/ipv4/tcp.c:4649 tcp_rcv_state_process+0x40e7/0x4990 net/ ipv4/tcp_input.c:6624 tcp_v6_do_rcv+0x3fc/0x13c0 net/ipv6/tcp_ipv6.c:1525 tcp_v6_rcv+0x2e8e/0x3830 net/ipv6/tcp_ipv6.c:1759 ip6_protocol_deliver_rcu+0x2db/0x1950 net/ipv6/ip6_input.c:439 ip6_input_finish +0x14c/0x2c0 net/ipv6/ip6_input.c:484 NF_HOOK include/linux/netfilter.h:302 [内联] NF_HOOK include/linux/netfilter.h:296 [内联] ip6_input+0x9c/0xd ---truncated--- (CVE-2022-49775)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

检测

Linux Distros 未修补的漏洞：CVE-2022-49775

high Nessus 插件 ID 247875

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