{"cve":"CVE-2022-50405","nvd":{"published":"2025-09-18T16:15:43.630","modified":"2026-08-04T10:18:14.967","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tunnel: wait until all sk_user_data reader finish before releasing the sock\n\nThere is a race condition in vxlan that when deleting a vxlan device\nduring receiving packets, there is a possibility that the sock is\nreleased after getting vxlan_sock vs from sk_user_data. Then in\nlater vxlan_ecn_decapsulate(), vxlan_get_sk_family() we will got\nNULL pointer dereference. e.g.\n\n   #0 [ffffa25ec6978a38] machine_kexec at ffffffff8c669757\n   #1 [ffffa25ec6978a90] __crash_kexec at ffffffff8c7c0a4d\n   #2 [ffffa25ec6978b58] crash_kexec at ffffffff8c7c1c48\n   #3 [ffffa25ec6978b60] oops_end at ffffffff8c627f2b\n   #4 [ffffa25ec6978b80] page_fault_oops at ffffffff8c678fcb\n   #5 [ffffa25ec6978bd8] exc_page_fault at ffffffff8d109542\n   #6 [ffffa25ec6978c00] asm_exc_page_fault at ffffffff8d200b62\n      [exception RIP: vxlan_ecn_decapsulate+0x3b]\n      RIP: ffffffffc1014e7b  RSP: ffffa25ec6978cb0  RFLAGS: 00010246\n      RAX: 0000000000000008  RBX: ffff8aa000888000  RCX: 0000000000000000\n      RDX: 000000000000000e  RSI: ffff8a9fc7ab803e  RDI: ffff8a9fd1168700\n      RBP: ffff8a9fc7ab803e   R8: 0000000000700000   R9: 00000000000010ae\n      R10: ffff8a9fcb748980  R11: 0000000000000000  R12: ffff8a9fd1168700\n      R13: ffff8aa000888000  R14: 00000000002a0000  R15: 00000000000010ae\n      ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018\n   #7 [ffffa25ec6978ce8] vxlan_rcv at ffffffffc10189cd [vxlan]\n   #8 [ffffa25ec6978d90] udp_queue_rcv_one_skb at ffffffff8cfb6507\n   #9 [ffffa25ec6978dc0] udp_unicast_rcv_skb at ffffffff8cfb6e45\n  #10 [ffffa25ec6978dc8] __udp4_lib_rcv at ffffffff8cfb8807\n  #11 [ffffa25ec6978e20] ip_protocol_deliver_rcu at ffffffff8cf76951\n  #12 [ffffa25ec6978e48] ip_local_deliver at ffffffff8cf76bde\n  #13 [ffffa25ec6978ea0] __netif_receive_skb_one_core at ffffffff8cecde9b\n  #14 [ffffa25ec6978ec8] process_backlog at ffffffff8cece139\n  #15 [ffffa25ec6978f00] __napi_poll at ffffffff8ceced1a\n  #16 [ffffa25ec6978f28] net_rx_action at ffffffff8cecf1f3\n  #17 [ffffa25ec6978fa0] __softirqentry_text_start at ffffffff8d4000ca\n  #18 [ffffa25ec6978ff0] do_softirq at ffffffff8c6fbdc3\n\nReproducer: https://github.com/Mellanox/ovs-tests/blob/master/test-ovs-vxlan-remove-tunnel-during-traffic.sh\n\nFix this by waiting for all sk_user_data reader to finish before\nreleasing the sock.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/303000c793f705d07b551eb7c1c27001c5b33c8d","https://git.kernel.org/stable/c/3cf7203ca620682165706f70a1b12b5194607dce","https://git.kernel.org/stable/c/588d0b8462f5ffed3e677e65639825b2678117ab","https://git.kernel.org/stable/c/84e566d157cc22ad2da8bdd970495855fbf13d92","https://git.kernel.org/stable/c/91f09a776ae335ca836ed864b8f2a9461882a280"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:10:08.713834912+00:00"},"epss":{"cve":"CVE-2022-50405","score":0.00175,"percentile":0.06968,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}