CVE-2022-50405 (GCVE-0-2022-50405)
Vulnerability from cvelistv5 – Published: 2025-09-18 16:03 – Updated: 2026-08-05 08:58
VLAI
EPSS
VEX
Title
net/tunnel: wait until all sk_user_data reader finish before releasing the sock
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/tunnel: wait until all sk_user_data reader finish before releasing the sock
There is a race condition in vxlan that when deleting a vxlan device
during receiving packets, there is a possibility that the sock is
released after getting vxlan_sock vs from sk_user_data. Then in
later vxlan_ecn_decapsulate(), vxlan_get_sk_family() we will got
NULL pointer dereference. e.g.
#0 [ffffa25ec6978a38] machine_kexec at ffffffff8c669757
#1 [ffffa25ec6978a90] __crash_kexec at ffffffff8c7c0a4d
#2 [ffffa25ec6978b58] crash_kexec at ffffffff8c7c1c48
#3 [ffffa25ec6978b60] oops_end at ffffffff8c627f2b
#4 [ffffa25ec6978b80] page_fault_oops at ffffffff8c678fcb
#5 [ffffa25ec6978bd8] exc_page_fault at ffffffff8d109542
#6 [ffffa25ec6978c00] asm_exc_page_fault at ffffffff8d200b62
[exception RIP: vxlan_ecn_decapsulate+0x3b]
RIP: ffffffffc1014e7b RSP: ffffa25ec6978cb0 RFLAGS: 00010246
RAX: 0000000000000008 RBX: ffff8aa000888000 RCX: 0000000000000000
RDX: 000000000000000e RSI: ffff8a9fc7ab803e RDI: ffff8a9fd1168700
RBP: ffff8a9fc7ab803e R8: 0000000000700000 R9: 00000000000010ae
R10: ffff8a9fcb748980 R11: 0000000000000000 R12: ffff8a9fd1168700
R13: ffff8aa000888000 R14: 00000000002a0000 R15: 00000000000010ae
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#7 [ffffa25ec6978ce8] vxlan_rcv at ffffffffc10189cd [vxlan]
#8 [ffffa25ec6978d90] udp_queue_rcv_one_skb at ffffffff8cfb6507
#9 [ffffa25ec6978dc0] udp_unicast_rcv_skb at ffffffff8cfb6e45
#10 [ffffa25ec6978dc8] __udp4_lib_rcv at ffffffff8cfb8807
#11 [ffffa25ec6978e20] ip_protocol_deliver_rcu at ffffffff8cf76951
#12 [ffffa25ec6978e48] ip_local_deliver at ffffffff8cf76bde
#13 [ffffa25ec6978ea0] __netif_receive_skb_one_core at ffffffff8cecde9b
#14 [ffffa25ec6978ec8] process_backlog at ffffffff8cece139
#15 [ffffa25ec6978f00] __napi_poll at ffffffff8ceced1a
#16 [ffffa25ec6978f28] net_rx_action at ffffffff8cecf1f3
#17 [ffffa25ec6978fa0] __softirqentry_text_start at ffffffff8d4000ca
#18 [ffffa25ec6978ff0] do_softirq at ffffffff8c6fbdc3
Reproducer: https://github.com/Mellanox/ovs-tests/blob/master/test-ovs-vxlan-remove-tunnel-during-traffic.sh
Fix this by waiting for all sk_user_data reader to finish before
releasing the sock.
Severity
7.8 (High)
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 19:07 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d , < e8316584b0a6c61c9c407631040c22712b26e38c
(git)
Affected: 6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d , < 84e566d157cc22ad2da8bdd970495855fbf13d92 (git) Affected: 6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d , < be34e79e0ae6adbf6e7e75ddaee9ad84795ab933 (git) Affected: 6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d , < 303000c793f705d07b551eb7c1c27001c5b33c8d (git) Affected: 6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d , < 91f09a776ae335ca836ed864b8f2a9461882a280 (git) Affected: 6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d , < 9a6544343bba7da929d6d4a2dc44ec0f15970081 (git) Affected: 6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d , < b38aa7465411795e9e744b8d94633910497fec2a (git) Affected: 6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d , < 588d0b8462f5ffed3e677e65639825b2678117ab (git) Affected: 6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d , < 3cf7203ca620682165706f70a1b12b5194607dce (git) |
guessed | |
| Linux | Linux |
Affected:
3.18
Unaffected: 0 , < 3.18 (semver) Unaffected: 4.9.337 , ≤ 4.9.* (semver) Unaffected: 4.14.303 , ≤ 4.14.* (semver) Unaffected: 4.19.270 , ≤ 4.19.* (semver) Unaffected: 5.4.229 , ≤ 5.4.* (semver) Unaffected: 5.10.163 , ≤ 5.10.* (semver) Unaffected: 5.15.86 , ≤ 5.15.* (semver) Unaffected: 6.0.16 , ≤ 6.0.* (semver) Unaffected: 6.1.2 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix) |
guessed |
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"privilegesRequired": "LOW",
"scope": "UNCHANGED",
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"version": "6.0.16",
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{
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"version": "6.1.2",
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{
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"versionType": "original_commit_for_fix"
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"cpeApplicability": [
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"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": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"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\u2014deleting/stopping the tunnel device while flooding packets to its UDP encap socket\u2014so success does not depend on conditions outside their influence.\nPR:L - Tunnel create/delete needs CAP_NET_ADMIN checked in the network namespace\u2019s 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\u2019d, 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."
}
]
}
],
"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"references": [
{
"url": "https://git.kernel.org/stable/c/e8316584b0a6c61c9c407631040c22712b26e38c"
},
{
"url": "https://git.kernel.org/stable/c/84e566d157cc22ad2da8bdd970495855fbf13d92"
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{
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},
{
"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": {
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}
}
},
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"datePublished": "2025-09-18T16:03:50.362Z",
"dateReserved": "2025-09-17T14:53:07.001Z",
"dateUpdated": "2026-08-05T08:58:36.034Z",
"state": "PUBLISHED"
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{
"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."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T19:18:51.602Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2022-50405",
"datePublished": "2025-09-18T16:03:50.362Z",
"dateReserved": "2025-09-17T14:53:07.001Z",
"dateUpdated": "2026-05-11T19:18:51.602Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
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Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.