{"id":"CVE-2026-98849","title":"pfcp: fix socket lifetime on netdevice registration failure","summary":"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_ini…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 76c8764ef36a5d37ea2e551bda28ac7f028383ba < dcb8f6a79c3360a440c399d85df465a6e59351f1","Linux >= 76c8764ef36a5d37ea2e551bda28ac7f028383ba < 4b8ce1686dea1a10805a0807bf492409b0300ee1","Linux >= 76c8764ef36a5d37ea2e551bda28ac7f028383ba < 2cee3603ec1d9b5ec7f2121ea3efe9488e906f46","Linux >= 76c8764ef36a5d37ea2e551bda28ac7f028383ba < 0f17d2e3dd9cda3ee6d94033d5e5489af168920d","Linux 6.10"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:50:48.743Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98849","references":[{"url":"https://git.kernel.org/stable/c/dcb8f6a79c3360a440c399d85df465a6e59351f1"},{"url":"https://git.kernel.org/stable/c/4b8ce1686dea1a10805a0807bf492409b0300ee1"},{"url":"https://git.kernel.org/stable/c/2cee3603ec1d9b5ec7f2121ea3efe9488e906f46"},{"url":"https://git.kernel.org/stable/c/0f17d2e3dd9cda3ee6d94033d5e5489af168920d"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.465Z","slug":"CVE-2026-98849","body":"## Overview\n\nIn 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->sk.\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->sk is NULL.\n\n## Affected\n\n- `Linux >= 76c8764ef36a5d37ea2e551bda28ac7f028383ba < dcb8f6a79c3360a440c399d85df465a6e59351f1`\n- `Linux >= 76c8764ef36a5d37ea2e551bda28ac7f028383ba < 4b8ce1686dea1a10805a0807bf492409b0300ee1`\n- `Linux >= 76c8764ef36a5d37ea2e551bda28ac7f028383ba < 2cee3603ec1d9b5ec7f2121ea3efe9488e906f46`\n- `Linux >= 76c8764ef36a5d37ea2e551bda28ac7f028383ba < 0f17d2e3dd9cda3ee6d94033d5e5489af168920d`\n- `Linux 6.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}