{"id":"DEBIAN-CVE-2025-21677","details":"In the Linux kernel, the following vulnerability has been resolved:  pfcp: Destroy device along with udp socket's netns dismantle.  pfcp_newlink() links the device to a list in dev_net(dev) instead of net, where a udp tunnel socket is created.  Even when net is removed, the device stays alive on dev_net(dev). Then, removing net triggers the splat below. [0]  In this example, pfcp0 is created in ns2, but the udp socket is created in ns1.    ip netns add ns1   ip netns add ns2   ip -n ns1 link add netns ns2 name pfcp0 type pfcp   ip netns del ns1  Let's link the device to the socket's netns instead.  Now, pfcp_net_exit() needs another netdev iteration to remove all pfcp devices in the netns.  pfcp_dev_list is not used under RCU, so the list API is converted to the non-RCU variant.  pfcp_net_exit() can be converted to .exit_batch_rtnl() in net-next.  [0]: ref_tracker: net notrefcnt@00000000128b34dc has 1/1 users at      sk_alloc (./include/net/net_namespace.h:345 net/core/sock.c:2236)      inet_create (net/ipv4/af_inet.c:326 net/ipv4/af_inet.c:252)      __sock_create (net/socket.c:1558)      udp_sock_create4 (net/ipv4/udp_tunnel_core.c:18)      pfcp_create_sock (drivers/net/pfcp.c:168)      pfcp_newlink (drivers/net/pfcp.c:182 drivers/net/pfcp.c:197)      rtnl_newlink (net/core/rtnetlink.c:3786 net/core/rtnetlink.c:3897 net/core/rtnetlink.c:4012)      rtnetlink_rcv_msg (net/core/rtnetlink.c:6922)      netlink_rcv_skb (net/netlink/af_netlink.c:2542)      netlink_unicast (net/netlink/af_netlink.c:1321 net/netlink/af_netlink.c:1347)      netlink_sendmsg (net/netlink/af_netlink.c:1891)      ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2583)      ___sys_sendmsg (net/socket.c:2639)      __sys_sendmsg (net/socket.c:2669)      do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)      entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)  WARNING: CPU: 1 PID: 11 at lib/ref_tracker.c:179 ref_tracker_dir_exit (lib/ref_tracker.c:179) Modules linked in: CPU: 1 UID: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.13.0-rc5-00147-g4c1224501e9d #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 Workqueue: netns cleanup_net RIP: 0010:ref_tracker_dir_exit (lib/ref_tracker.c:179) 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 \u003c0f\u003e 0b 90 48 8d 6b 44 be 04 00 00 00 48 89 ef e8 80 de 67 ff 48 89 RSP: 0018:ff11000007f3fb60 EFLAGS: 00010286 RAX: 00000000000020ef RBX: ff1100000d6481e0 RCX: 1ffffffff0e40d82 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8423ee3c RBP: ff1100000d648230 R08: 0000000000000001 R09: fffffbfff0e395af R10: 0000000000000001 R11: 0000000000000000 R12: ff1100000d648230 R13: dead000000000100 R14: ff1100000d648230 R15: dffffc0000000000 FS:  0000000000000000(0000) GS:ff1100006ce80000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005620e1363990 CR3: 000000000eeb2002 CR4: 0000000000771ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400 PKRU: 55555554 Call Trace:  \u003cTASK\u003e  ? __warn (kernel/panic.c:748)  ? ref_tracker_dir_exit (lib/ref_tracker.c:179)  ? report_bug (lib/bug.c:201 lib/bug.c:219)  ? handle_bug (arch/x86/kernel/traps.c:285)  ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))  ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)  ? _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)  ? ref_tracker_dir_exit (lib/ref_tracker.c:179)  ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:158)  ? kfree (mm/slub.c:4613 mm/slub.c:4761)  net_free (net/core/net_namespace.c:476 net/core/net_namespace.c:467)  cleanup_net (net/cor ---truncated---","modified":"2026-08-27T23:05:11.701473690Z","published":"2025-01-31T12:15:28.877Z","upstream":["CVE-2025-21677"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-21677"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.11-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-21677.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.11-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-21677.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}