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。

  - ax25rcu 保护 dev->ax25_ptr syzbot 发现 lockdep 问题 [1]。应删除 ax25_setsockopt() 中的 ax25 RTNL 依存关系 这还应修复 ax25 中各种可能的 UAF。 [1] 警告已检测到可能的循环锁定依存关系 6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0 未受感染
    -------------------------------------------------- ---- syz.5.1818/12806 尝试获取锁定
    ffffffff8fcb3988 (rtnl_mutex){+.+.}-{4:4}位于 ax25_setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680但任务已持有锁定ffff8880617ac258 (sk_lock-AF_AX25){+.+. }-{0:0}位于lock_sock include/net/sock.h:1618 [inline] ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}位于
    ax25_setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574哪个锁定已经依赖于新的锁定。现有依存关系链按相反顺序为-> #1 (sk_lock-AF_AX25){+.+.}-{0:0}
    lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 lock_sock_nested+0x48/0x100 net/core/sock.c:3642 lock_sock include/net/sock.h:1618 [inline] ax25_kill_by_device net/ax25/af_ax25.c 101 [inline] ax25_device_event+0x24d/0x580 net/ax25/af_ax25.c:146 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
    __dev_notify_flags+0x207/0x400 dev_change_flags+0xf0/0x1a0 net/core/dev.c:9026 dev_ifsioc+0x7c8/0xe70 net/core/dev_ioctl.c:563 dev_ioctl+0x719/0x1340 net/core/dev_ioctl.c:820 sock_do_ioctl+0x240 /0x460 net/socket.c:1234 sock_ioctl+0x626/0x8e0 net/socket.c:1339 vfs_ioctl fs/ioctl.c:51 [内联] __do_sys_ioctl fs/ioctl.c:906 [内联] __se_sys_ioctl+0xf5/0x170 fs/ ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [内联] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (rtnl_mutex){+ .+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
    __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [内联]
    __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735 ax25_setsockopt+0xa55/0xe90 net/ax25/af_ax25.c:680 do_sock_setsockopt+0x3af/0x720 net/socket.c:2324 __sys_setsockopt net/socket.c:2349 [内联]
    __do_sys_setsockopt net/socket.c:2355 [内联] __se_sys_setsockopt net/socket.c:2352 [内联]
    __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2352 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f 其他信息这可能有助于我们调试此问题 可能不安全的锁定情况CPU0 CPU1 ---- ---- lock(sk_lock-AF_AX25); lock(rtnl_mutex); lock(sk_lock-AF_AX25); lock(rtnl_mutex); #0...0:0​ [内联] #0ffff8880617ac258 (sk_lock-AF_AX25){+.+.}-{0:0}位于
    ax25_setsockopt+0x209/0xe90 net/ax25/af_ax25.c:574 堆栈回溯CPU: 1 UID: 0 PID: 12806 Comm
    syz.5.1818 未受感染 6.13.0-rc3-syzkaller-00762-g9268abe611b0 #0 硬件名称Google Google Compute Engine/Google Compute Engine、BIOS Google 09/13/2024 Call Trace <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep。 c:3161 [inline] check_prevs_add kernel/lockin ---truncated--- (CVE-2025-21812)

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-2025-21812

high Nessus 插件 ID 231062

版本 1.8