{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50405", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:53:07.001Z", "datePublished": "2025-09-18T16:03:50.362Z", "dateUpdated": "2026-08-05T08:58:36.034Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:58:36.034Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires creating and deleting a UDP tunnel device (VXLAN/Geneve/etc.) via RTNL while racing packet receive; a remote peer alone cannot trigger sock release. An unprivileged local attacker in a user+net namespace can orchestrate both sides.\nAC:L - The attacker controls both sides of the race—deleting/stopping the tunnel device while flooding packets to its UDP encap socket—so success does not depend on conditions outside their influence.\nPR:L - Tunnel create/delete needs CAP_NET_ADMIN checked in the network namespace’s user_ns (rtnetlink), which an unprivileged user obtains via user namespaces (unshare -Urn), not real init-ns root.\nUI:N - No victim interaction is required; the attacker locally creates traffic and tears down the tunnel device themselves.\nS:U - Impact is confined to the local kernel/host privilege boundary; this is a standard kernel UAF/privilege-escalation issue, not a VM/IOMMU/sandbox escape.\nC:H - Missing synchronize_rcu() before sock_release allows vxlan_rcv to keep using sk_user_data after the socket is released and the vxlan_sock is kfree’d, a UAF that can yield arbitrary kernel read primitives.\nI:H - The same UAF of vxlan_sock/socket objects during concurrent encap receive enables heap reuse and write/control-flow hijacking primitives beyond a mere crash.\nA:H - The race causes a kernel NULL deref/oops in vxlan_ecn_decapsulate/vxlan_get_sk_family (and UAF crashes more generally), fully disrupting availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/udp_tunnel_core.c" ], "versions": [ { "version": "6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d", "lessThan": "e8316584b0a6c61c9c407631040c22712b26e38c", "status": "affected", "versionType": "git" }, { "version": "6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d", "lessThan": "84e566d157cc22ad2da8bdd970495855fbf13d92", "status": "affected", "versionType": "git" }, { "version": "6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d", "lessThan": "be34e79e0ae6adbf6e7e75ddaee9ad84795ab933", "status": "affected", "versionType": "git" }, { "version": "6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d", "lessThan": "303000c793f705d07b551eb7c1c27001c5b33c8d", "status": "affected", "versionType": "git" }, { "version": "6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d", "lessThan": "91f09a776ae335ca836ed864b8f2a9461882a280", "status": "affected", "versionType": "git" }, { "version": "6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d", "lessThan": "9a6544343bba7da929d6d4a2dc44ec0f15970081", "status": "affected", "versionType": "git" }, { "version": "6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d", "lessThan": "b38aa7465411795e9e744b8d94633910497fec2a", "status": "affected", "versionType": "git" }, { "version": "6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d", "lessThan": "588d0b8462f5ffed3e677e65639825b2678117ab", "status": "affected", "versionType": "git" }, { "version": "6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d", "lessThan": "3cf7203ca620682165706f70a1b12b5194607dce", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/udp_tunnel_core.c" ], "versions": [ { "version": "3.18", "status": "affected" }, { "version": "0", "lessThan": "3.18", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.337", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.303", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.270", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.86", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.16", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.2", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "4.9.337" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "4.14.303" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "5.15.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.0.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.1.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e8316584b0a6c61c9c407631040c22712b26e38c" }, { "url": "https://git.kernel.org/stable/c/84e566d157cc22ad2da8bdd970495855fbf13d92" }, { "url": "https://git.kernel.org/stable/c/be34e79e0ae6adbf6e7e75ddaee9ad84795ab933" }, { "url": "https://git.kernel.org/stable/c/303000c793f705d07b551eb7c1c27001c5b33c8d" }, { "url": "https://git.kernel.org/stable/c/91f09a776ae335ca836ed864b8f2a9461882a280" }, { "url": "https://git.kernel.org/stable/c/9a6544343bba7da929d6d4a2dc44ec0f15970081" }, { "url": "https://git.kernel.org/stable/c/b38aa7465411795e9e744b8d94633910497fec2a" }, { "url": "https://git.kernel.org/stable/c/588d0b8462f5ffed3e677e65639825b2678117ab" }, { "url": "https://git.kernel.org/stable/c/3cf7203ca620682165706f70a1b12b5194607dce" } ], "title": "net/tunnel: wait until all sk_user_data reader finish before releasing the sock", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-50405", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T19:07:29.951048Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:13:08.244Z" } } ] } }