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。

  - BluetoothL2CAP修复 l2cap_send_cmd 中的 slab 释放后使用读取 hci sync 命令释放 l2cap_conn 之后hci 接收数据工作队列在向上层发送时会引用释放的 l2cap_conn。将 hci dev lock 添加到 hci 接收数据工作队列以同步两者。 [1] BUGKASAN通过任务 kworker/u9:2/5837 CPU: 0 UID 0 PID5837 Commkworker/u9:2 Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0 硬件名称Google Google Compute Engine/Google Compute Engine、BIOS Google 2024 年 9 月 13 日工作队列hci1 hci_rx_work Call Trace <TASK> __dump_stack lib/dump_stack.c:94 [内联] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [内联] print_report+0x169/0x550 mm/kasan/report .c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 l2cap_build_cmd net/bluetooth/l2cap_core.c:2964 [inline] l2cap_send_cmd+0x187/0x8d0 net/bluetooth/l2cap_core.c:954 l2cap_sig_send_rej net/bluetooth/ l2cap_core.c:5502 [内联] l2cap_sig_channel net/bluetooth/l2cap_core.c:5538 [内联] l2cap_recv_frame+0x221f/0x10db0 net/bluetooth/l2cap_core.c:6817 hci_acldata_packet net/bluetooth/hci_core.c:3797 [内联] hci_rx_w ork+0x508/0xdb0 net/bluetooth/hci_core.c:4040 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread +0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> 由任务 5837 分配kasan_save_stack mm/kasan/common.c:47 [内联] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68毒害_kmalloc_redzone mm/kasan/common.c:377 [内联] __kasan_kmalloc+0x98/0xb0 mm/kasan/common .c:394 kasan_kmalloc include/linux/kasan.h:260 [内联] __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4329 kmalloc_noprof include/linux/slab.h:901 [内联] kzalloc_noprof include/linux/slab.h 1037 [inline] l2cap_conn_add+0xa9/0x8e0 net/bluetooth/l2cap_core.c:6860 l2cap_connect_cfm+0x115/0x1090 net/bluetooth/l2cap_core.c:7239 hci_connect_cfm include/net/bluetooth/hci_core.h:2057 [inline] hci_remote_features_evt 0x68e/0xac 0 net/bluetooth/hci_event.c:3726 hci_event_func net/bluetooth/hci_event.c:7473 [inline] hci_event_packet+0xac2/0x1540 net/bluetooth/hci_event.c:7525 hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c 4035 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+ 0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 已由任务 54释放
    kasan_save_stack mm/kasan/common.c:47 [内联] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582poison_slab_object mm/kasan/common.c 247 [内联]
    __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [内联] slab_free_hook mm/slub.c:2353 [内联] slab_free mm/slub.c:4613 [内联] kfree +0x196/0x430 mm/slub.c:4761 l2cap_connect_cfm+0xcc/0x1090 net/bluetooth/l2cap_core.c:7235 hci_connect_cfm include/net/bluetooth/hci_core.h:2057 [inline] hci_conn_failed+0x287/0x400 net/bluetooth/hci_conn .c:1266 hci_abort_conn_sync+0x56c/0x11f0 net/bluetooth/hci_sync.c:5603 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:332 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/ workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entr ---truncated--- (CVE-2025-21969)

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-2025-21969

high Nessus 插件 ID 245887

版本 1.20