Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2025-21677— pfcp: Destroy device along with udp socket's netns dismantle.

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于pfcp_newlink函数将设备链接到错误的网络命名空间dev_net(dev)，而不是正确的net。当net被移除时，设备仍然存活，导致引用计数错误和系统崩溃。

CVSS 7.8 · High EPSS 0.19% · P8

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 76c8764ef36a5d37ea2e551bda28ac7f028383ba< 1c35a66e2bfea53dea3562b2575ac7fd4c38ee61 affected
76c8764ef36a5d37ea2e551bda28ac7f028383ba< ffc90e9ca61b0f619326a1417ff32efd6cc71ed2 affected
6.10 affected
< 6.10 unaffected
6.12.11≤ 6.12.* unaffected
6.13≤ * unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2025-21677

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
pfcp: Destroy device along with udp socket's netns dismantle.
Source: CVE Program / CVE List V5
Vulnerability Description
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 <0f> 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: <TASK> ? __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---
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于pfcp_newlink函数将设备链接到错误的网络命名空间dev_net(dev)，而不是正确的net。当net被移除时，设备仍然存活，导致引用计数错误和系统崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 76c8764ef36a5d37ea2e551bda28ac7f028383ba ~ 1c35a66e2bfea53dea3562b2575ac7fd4c38ee61 -
Linux Linux 6.10 -

II. Public POCs for CVE-2025-21677

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2025-21677

请登录查看更多情报信息。

Patches & Fixes for CVE-2025-21677 (2)

Same Patch Batch · Linux · 2025-01-31 · 20 CVEs total

CVE-2025-21673 9.8 CRITICAL smb: client: fix double free of TCP_Server_Info::hostname
CVE-2025-21669 7.8 HIGH vsock/virtio: discard packets if the transport changes
CVE-2025-21680 7.8 HIGH pktgen: Avoid out-of-bounds access in get_imix_entries
CVE-2025-21678 7.8 HIGH gtp: Destroy device along with udp socket's netns dismantle.
CVE-2025-21676 7.5 HIGH net: fec: handle page_pool_dev_alloc_pages error
CVE-2025-21682 7.3 HIGH eth: bnxt: always recalculate features after XDP clearing, fix null-deref
CVE-2025-21679 btrfs: add the missing error handling inside get_canonical_dev_path
CVE-2025-21675 net/mlx5: Clear port select structure when fail to create
CVE-2025-21674 net/mlx5e: Fix inversion dependency warning while enabling IPsec tunnel
CVE-2025-21681 openvswitch: fix lockup on tx to unregistering netdev with carrier
CVE-2025-21672 afs: Fix merge preference rule failure condition
CVE-2025-21671 zram: fix potential UAF of zram table
CVE-2025-21670 vsock/bpf: return early if transport is not assigned
CVE-2025-21683 bpf: Fix bpf_sk_select_reuseport() memory leak
CVE-2025-21668 pmdomain: imx8mp-blk-ctrl: add missing loop break condition
CVE-2025-21667 iomap: avoid avoid truncating 64-bit offset to 32 bits
CVE-2025-21666 vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]
CVE-2025-21665 filemap: avoid truncating 64-bit offset to 32 bits
CVE-2024-57948 mac802154: check local interfaces before deleting sdata list

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21677

No comments yet

Leave a comment