{"id":"CVE-2022-50405","summary":"net/tunnel: wait until all sk_user_data reader finish before releasing the sock","details":"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.","modified":"2026-04-02T08:28:29.044317Z","published":"2025-09-18T16:03:50.362Z","related":["SUSE-SU-2025:03614-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50405.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/303000c793f705d07b551eb7c1c27001c5b33c8d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3cf7203ca620682165706f70a1b12b5194607dce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/588d0b8462f5ffed3e677e65639825b2678117ab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84e566d157cc22ad2da8bdd970495855fbf13d92"},{"type":"WEB","url":"https://git.kernel.org/stable/c/91f09a776ae335ca836ed864b8f2a9461882a280"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9a6544343bba7da929d6d4a2dc44ec0f15970081"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b38aa7465411795e9e744b8d94633910497fec2a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/be34e79e0ae6adbf6e7e75ddaee9ad84795ab933"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e8316584b0a6c61c9c407631040c22712b26e38c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50405.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50405"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d"},{"fixed":"e8316584b0a6c61c9c407631040c22712b26e38c"},{"fixed":"84e566d157cc22ad2da8bdd970495855fbf13d92"},{"fixed":"be34e79e0ae6adbf6e7e75ddaee9ad84795ab933"},{"fixed":"303000c793f705d07b551eb7c1c27001c5b33c8d"},{"fixed":"91f09a776ae335ca836ed864b8f2a9461882a280"},{"fixed":"9a6544343bba7da929d6d4a2dc44ec0f15970081"},{"fixed":"b38aa7465411795e9e744b8d94633910497fec2a"},{"fixed":"588d0b8462f5ffed3e677e65639825b2678117ab"},{"fixed":"3cf7203ca620682165706f70a1b12b5194607dce"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50405.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}