Live › vulnerability › CVE-2026-98849
Go to dashboardWhen creating a pfcp network device fails during registration, the kernel releases the same UDP socket twice, causing a NULL pointer dereference. The sources describe a crash triggered during device creation, and do not describe code execution.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Systems running a Linux kernel with the pfcp driver (PFCP tunnelling, used with 5G user-plane setups) where a device is created by a user with the ability to run netlink link creation. Hosts that do not load the pfcp module can skip it. The sources do not say which kernel versions are affected.
No product ranges from the sources yet.
uname -r and compare it with the fixed kernel named in the advisory.lsmod | grep pfcp or modinfo pfcp.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
In the Linux kernel, the following vulnerability has been resolved:
pfcp: fix socket lifetime on netdevice registration failure
pfcp_newlink() creates the UDP socket before register_netdevice(). If registration fails after pfcp_dev_init() succeeds, the core calls pfcp_dev_uninit(), which releases the socket and clears pfcp->sk. The newlink error path then releases it again, causing a NULL pointer dereference. This was observed with failslab fault injection:
FAULT_INJECTION: forcing a failure. kobject: kobject_add_internal failed for pfcp0 (error: -12 parent: net) BUG: KASAN: null-ptr-deref in udp_tunnel_sock_release+0x1c/0x50 Read of size 8 at addr 0000000000000120 by task ip/1037 Call trace: show_stack+0x18/0x24 (C) dump_stack_lvl+0x78/0x90 print_report+0x468/0x5cc kasan_report+0xa4/0xf0 __asan_load8+0x7c/0xd0 udp_tunnel_sock_release+0x1c/0x50 pfcp_newlink+0x128/0x184 rtnl_newlink+0x848/0xe44 rtnetlink_rcv_msg+0x468/0x514 netlink_rcv_skb+0xc0/0x1f0 rtnetlink_rcv+0x18/0x24 netlink_unicast+0x4b8/0x558 netlink_sendmsg+0x2b8/0x584 ...
Return from pfcp_del_sock() if pfcp->sk is NULL.
This page as .md · .json · in your agent: get_signal("CVE-2026-98849")
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