{"id":"CVE-2026-98849","summary":"pfcp: fix socket lifetime on netdevice registration failure","details":"In the Linux kernel, the following vulnerability has been resolved:\n\npfcp: fix socket lifetime on netdevice registration failure\n\npfcp_newlink() creates the UDP socket before register_netdevice().\nIf registration fails after pfcp_dev_init() succeeds, the core calls\npfcp_dev_uninit(), which releases the socket and clears pfcp-\u003esk.\nThe newlink error path then releases it again, causing a NULL pointer\ndereference. This was observed with failslab fault injection:\n\n  FAULT_INJECTION: forcing a failure.\n  kobject: kobject_add_internal failed for pfcp0 (error: -12 parent: net)\n  BUG: KASAN: null-ptr-deref in udp_tunnel_sock_release+0x1c/0x50\n  Read of size 8 at addr 0000000000000120 by task ip/1037\n  Call trace:\n   show_stack+0x18/0x24 (C)\n   dump_stack_lvl+0x78/0x90\n   print_report+0x468/0x5cc\n   kasan_report+0xa4/0xf0\n   __asan_load8+0x7c/0xd0\n   udp_tunnel_sock_release+0x1c/0x50\n   pfcp_newlink+0x128/0x184\n   rtnl_newlink+0x848/0xe44\n   rtnetlink_rcv_msg+0x468/0x514\n   netlink_rcv_skb+0xc0/0x1f0\n   rtnetlink_rcv+0x18/0x24\n   netlink_unicast+0x4b8/0x558\n   netlink_sendmsg+0x2b8/0x584\n   ...\n\nReturn from pfcp_del_sock() if pfcp-\u003esk is NULL.","modified":"2026-10-20T02:30:54.264424572Z","published":"2026-10-18T15:50:48.743Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98849.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0f17d2e3dd9cda3ee6d94033d5e5489af168920d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2cee3603ec1d9b5ec7f2121ea3efe9488e906f46"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4b8ce1686dea1a10805a0807bf492409b0300ee1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dcb8f6a79c3360a440c399d85df465a6e59351f1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98849.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98849"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"76c8764ef36a5d37ea2e551bda28ac7f028383ba"},{"fixed":"dcb8f6a79c3360a440c399d85df465a6e59351f1"},{"fixed":"4b8ce1686dea1a10805a0807bf492409b0300ee1"},{"fixed":"2cee3603ec1d9b5ec7f2121ea3efe9488e906f46"},{"fixed":"0f17d2e3dd9cda3ee6d94033d5e5489af168920d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98849.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.10.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.56"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98849.json"}}],"schema_version":"1.9.0"}