CVE-2025-38245

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> atm: Release atm_dev_mutex after removing procfs in atm_dev_deregister().<br /> <br /> syzbot reported a warning below during atm_dev_register(). [0]<br /> <br /> Before creating a new device and procfs/sysfs for it, atm_dev_register()<br /> looks up a duplicated device by __atm_dev_lookup(). These operations are<br /> done under atm_dev_mutex.<br /> <br /> However, when removing a device in atm_dev_deregister(), it releases the<br /> mutex just after removing the device from the list that __atm_dev_lookup()<br /> iterates over.<br /> <br /> So, there will be a small race window where the device does not exist on<br /> the device list but procfs/sysfs are still not removed, triggering the<br /> splat.<br /> <br /> Let&amp;#39;s hold the mutex until procfs/sysfs are removed in<br /> atm_dev_deregister().<br /> <br /> [0]:<br /> proc_dir_entry &amp;#39;atm/atmtcp:0&amp;#39; already registered<br /> WARNING: CPU: 0 PID: 5919 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377<br /> Modules linked in:<br /> CPU: 0 UID: 0 PID: 5919 Comm: syz-executor284 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full)<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025<br /> RIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377<br /> Code: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8 00 00 00 e8 0c 02 1c ff 90 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48<br /> RSP: 0018:ffffc9000466fa30 EFLAGS: 00010282<br /> RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae248<br /> RDX: ffff888026280000 RSI: ffffffff817ae255 RDI: 0000000000000001<br /> RBP: ffff8880232bed48 R08: 0000000000000001 R09: 0000000000000000<br /> R10: 0000000000000000 R11: 0000000000000001 R12: ffff888076ed2140<br /> R13: dffffc0000000000 R14: ffff888078a61340 R15: ffffed100edda444<br /> FS: 00007f38b3b0c6c0(0000) GS:ffff888124753000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 00007f38b3bdf953 CR3: 0000000076d58000 CR4: 00000000003526f0<br /> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br /> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400<br /> Call Trace:<br /> <br /> proc_create_data+0xbe/0x110 fs/proc/generic.c:585<br /> atm_proc_dev_register+0x112/0x1e0 net/atm/proc.c:361<br /> atm_dev_register+0x46d/0x890 net/atm/resources.c:113<br /> atmtcp_create+0x77/0x210 drivers/atm/atmtcp.c:369<br /> atmtcp_attach drivers/atm/atmtcp.c:403 [inline]<br /> atmtcp_ioctl+0x2f9/0xd60 drivers/atm/atmtcp.c:464<br /> do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159<br /> sock_do_ioctl+0x115/0x280 net/socket.c:1190<br /> sock_ioctl+0x227/0x6b0 net/socket.c:1311<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:907 [inline]<br /> __se_sys_ioctl fs/ioctl.c:893 [inline]<br /> __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> RIP: 0033:0x7f38b3b74459<br /> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48<br /> RSP: 002b:00007f38b3b0c198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010<br /> RAX: ffffffffffffffda RBX: 00007f38b3bfe318 RCX: 00007f38b3b74459<br /> RDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000005<br /> RBP: 00007f38b3bfe310 R08: 65732f636f72702f R09: 65732f636f72702f<br /> R10: 65732f636f72702f R11: 0000000000000246 R12: 00007f38b3bcb0ac<br /> R13: 00007f38b3b0c1a0 R14: 0000200000000200 R15: 00007f38b3bcb03b<br />