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CVE-2026-98849

Linux: pfcp: fix socket lifetime on netdevice registration failure

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 5% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in4b8ce1686dea1a10805a0807bf492409b0300ee1Also 2cee3603ec1d9b5ec7f2121ea3efe9488e906f46, 0f17d2e3dd9cda3ee6d94033d5e5489af168920dCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 4b8ce1686dea1a10805a0807bf492409b0300ee1LinuxCVE List
  • 2cee3603ec1d9b5ec7f2121ea3efe9488e906f46LinuxCVE List
  • 0f17d2e3dd9cda3ee6d94033d5e5489af168920dLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 10

  • Linuxaffected: 76c8764ef36a5d37ea2e551bda28ac7f028383ba before dcb8f6a79c3360a440c399d85df465a6e59351f1CVE List
  • Linuxaffected: 76c8764ef36a5d37ea2e551bda28ac7f028383ba before 4b8ce1686dea1a10805a0807bf492409b0300ee1CVE List
  • Linuxaffected: 76c8764ef36a5d37ea2e551bda28ac7f028383ba before 2cee3603ec1d9b5ec7f2121ea3efe9488e906f46CVE List
  • Linuxaffected: 76c8764ef36a5d37ea2e551bda28ac7f028383ba before 0f17d2e3dd9cda3ee6d94033d5e5489af168920dCVE List
  • Linuxaffected: 6.10CVE List
  • Linuxunaffected: all versions before 6.10CVE List
  • Linuxunaffected: 6.12.113 through 6.12.*CVE List
  • Linuxunaffected: 6.18.56 through 6.18.*CVE List
  • Linuxunaffected: 7.2.10 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 4