CVE-2025-38459

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> atm: clip: Fix infinite recursive call of clip_push().<br /> <br /> syzbot reported the splat below. [0]<br /> <br /> This happens if we call ioctl(ATMARP_MKIP) more than once.<br /> <br /> During the first call, clip_mkip() sets clip_push() to vcc-&gt;push(),<br /> and the second call copies it to clip_vcc-&gt;old_push().<br /> <br /> Later, when the socket is close()d, vcc_destroy_socket() passes<br /> NULL skb to clip_push(), which calls clip_vcc-&gt;old_push(),<br /> triggering the infinite recursion.<br /> <br /> Let&amp;#39;s prevent the second ioctl(ATMARP_MKIP) by checking<br /> vcc-&gt;user_back, which is allocated by the first call as clip_vcc.<br /> <br /> Note also that we use lock_sock() to prevent racy calls.<br /> <br /> [0]:<br /> BUG: TASK stack guard page was hit at ffffc9000d66fff8 (stack is ffffc9000d670000..ffffc9000d678000)<br /> Oops: stack guard page: 0000 [#1] SMP KASAN NOPTI<br /> CPU: 0 UID: 0 PID: 5322 Comm: syz.0.0 Not tainted 6.16.0-rc4-syzkaller #0 PREEMPT(full)<br /> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014<br /> RIP: 0010:clip_push+0x5/0x720 net/atm/clip.c:191<br /> Code: e0 8f aa 8c e8 1c ad 5b fa eb ae 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 57 41 56 41 55 41 54 53 48 83 ec 20 48 89 f3 49 89 fd 48 bd 00<br /> RSP: 0018:ffffc9000d670000 EFLAGS: 00010246<br /> RAX: 1ffff1100235a4a5 RBX: ffff888011ad2508 RCX: ffff8880003c0000<br /> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888037f01000<br /> RBP: dffffc0000000000 R08: ffffffff8fa104f7 R09: 1ffffffff1f4209e<br /> R10: dffffc0000000000 R11: ffffffff8a99b300 R12: ffffffff8a99b300<br /> R13: ffff888037f01000 R14: ffff888011ad2500 R15: ffff888037f01578<br /> FS: 000055557ab6d500(0000) GS:ffff88808d250000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: ffffc9000d66fff8 CR3: 0000000043172000 CR4: 0000000000352ef0<br /> Call Trace:<br /> <br /> clip_push+0x6dc/0x720 net/atm/clip.c:200<br /> clip_push+0x6dc/0x720 net/atm/clip.c:200<br /> clip_push+0x6dc/0x720 net/atm/clip.c:200<br /> ...<br /> clip_push+0x6dc/0x720 net/atm/clip.c:200<br /> clip_push+0x6dc/0x720 net/atm/clip.c:200<br /> clip_push+0x6dc/0x720 net/atm/clip.c:200<br /> vcc_destroy_socket net/atm/common.c:183 [inline]<br /> vcc_release+0x157/0x460 net/atm/common.c:205<br /> __sock_release net/socket.c:647 [inline]<br /> sock_close+0xc0/0x240 net/socket.c:1391<br /> __fput+0x449/0xa70 fs/file_table.c:465<br /> task_work_run+0x1d1/0x260 kernel/task_work.c:227<br /> resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]<br /> exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114<br /> exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]<br /> syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]<br /> syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]<br /> do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> RIP: 0033:0x7ff31c98e929<br /> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48<br /> RSP: 002b:00007fffb5aa1f78 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4<br /> RAX: 0000000000000000 RBX: 0000000000012747 RCX: 00007ff31c98e929<br /> RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003<br /> RBP: 00007ff31cbb7ba0 R08: 0000000000000001 R09: 0000000db5aa226f<br /> R10: 00007ff31c7ff030 R11: 0000000000000246 R12: 00007ff31cbb608c<br /> R13: 00007ff31cbb6080 R14: ffffffffffffffff R15: 00007fffb5aa2090<br /> <br /> Modules linked in: