CVE-2025-21677

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> pfcp: Destroy device along with udp socket&amp;#39;s netns dismantle.<br /> <br /> pfcp_newlink() links the device to a list in dev_net(dev) instead<br /> of net, where a udp tunnel socket is created.<br /> <br /> Even when net is removed, the device stays alive on dev_net(dev).<br /> Then, removing net triggers the splat below. [0]<br /> <br /> In this example, pfcp0 is created in ns2, but the udp socket is<br /> created in ns1.<br /> <br /> ip netns add ns1<br /> ip netns add ns2<br /> ip -n ns1 link add netns ns2 name pfcp0 type pfcp<br /> ip netns del ns1<br /> <br /> Let&amp;#39;s link the device to the socket&amp;#39;s netns instead.<br /> <br /> Now, pfcp_net_exit() needs another netdev iteration to remove<br /> all pfcp devices in the netns.<br /> <br /> pfcp_dev_list is not used under RCU, so the list API is converted<br /> to the non-RCU variant.<br /> <br /> pfcp_net_exit() can be converted to .exit_batch_rtnl() in net-next.<br /> <br /> [0]:<br /> ref_tracker: net notrefcnt@00000000128b34dc has 1/1 users at<br /> sk_alloc (./include/net/net_namespace.h:345 net/core/sock.c:2236)<br /> inet_create (net/ipv4/af_inet.c:326 net/ipv4/af_inet.c:252)<br /> __sock_create (net/socket.c:1558)<br /> udp_sock_create4 (net/ipv4/udp_tunnel_core.c:18)<br /> pfcp_create_sock (drivers/net/pfcp.c:168)<br /> pfcp_newlink (drivers/net/pfcp.c:182 drivers/net/pfcp.c:197)<br /> rtnl_newlink (net/core/rtnetlink.c:3786 net/core/rtnetlink.c:3897 net/core/rtnetlink.c:4012)<br /> rtnetlink_rcv_msg (net/core/rtnetlink.c:6922)<br /> netlink_rcv_skb (net/netlink/af_netlink.c:2542)<br /> netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1347)<br /> netlink_sendmsg (net/netlink/af_netlink.c:1891)<br /> ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2583)<br /> ___sys_sendmsg (net/socket.c:2639)<br /> __sys_sendmsg (net/socket.c:2669)<br /> do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)<br /> entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)<br /> <br /> WARNING: CPU: 1 PID: 11 at lib/ref_tracker.c:179 ref_tracker_dir_exit (lib/ref_tracker.c:179)<br /> Modules linked in:<br /> CPU: 1 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.13.0-rc5-00147-g4c1224501e9d #5<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014<br /> Workqueue: netns cleanup_net<br /> RIP: 0010:ref_tracker_dir_exit (lib/ref_tracker.c:179)<br /> Code: 00 00 00 fc ff df 4d 8b 26 49 bd 00 01 00 00 00 00 ad de 4c 39 f5 0f 85 df 00 00 00 48 8b 74 24 08 48 89 df e8 a5 cc 12 02 90 0b 90 48 8d 6b 44 be 04 00 00 00 48 89 ef e8 80 de 67 ff 48 89<br /> RSP: 0018:ff11000007f3fb60 EFLAGS: 00010286<br /> RAX: 00000000000020ef RBX: ff1100000d6481e0 RCX: 1ffffffff0e40d82<br /> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8423ee3c<br /> RBP: ff1100000d648230 R08: 0000000000000001 R09: fffffbfff0e395af<br /> R10: 0000000000000001 R11: 0000000000000000 R12: ff1100000d648230<br /> R13: dead000000000100 R14: ff1100000d648230 R15: dffffc0000000000<br /> FS: 0000000000000000(0000) GS:ff1100006ce80000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 00005620e1363990 CR3: 000000000eeb2002 CR4: 0000000000771ef0<br /> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br /> DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400<br /> PKRU: 55555554<br /> Call Trace:<br /> <br /> ? __warn (kernel/panic.c:748)<br /> ? ref_tracker_dir_exit (lib/ref_tracker.c:179)<br /> ? report_bug (lib/bug.c:201 lib/bug.c:219)<br /> ? handle_bug (arch/x86/kernel/traps.c:285)<br /> ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))<br /> ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)<br /> ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 ./arch/x86/include/asm/irqflags.h:155 ./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194)<br /> ? ref_tracker_dir_exit (lib/ref_tracker.c:179)<br /> ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:158)<br /> ? kfree (mm/slub.c:4613 mm/slub.c:4761)<br /> net_free (net/core/net_namespace.c:476 net/core/net_namespace.c:467)<br /> cleanup_net (net/cor<br /> ---truncated---