{"cve":{"cve_id":"CVE-2025-22021","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00459,"epss_percentile":0.38672,"epss_as_of":"2026-09-15","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: socket: Lookup orig tuple for IPv6 SNAT\n\nnf_sk_lookup_slow_v4 does the conntrack lookup for IPv4 packets to\nrestore the original 5-tuple in case of SNAT, to be able to find the\nright socket (if any). Then socket_match() can correctly check whether\nthe socket was transparent.\n\nHowever, the IPv6 counterpart (nf_sk_lookup_slow_v6) lacks this\nconntrack lookup, making xt_socket fail to match on the socket when the\npacket was SNATed. Add the same logic to nf_sk_lookup_slow_v6.\n\nIPv6 SNAT is used in Kubernetes clusters for pod-to-world packets, as\npods' addresses are in the fd00::/8 ULA subnet and need to be replaced\nwith the node's external address. Cilium leverages Envoy to enforce L7\npolicies, and Envoy uses transparent sockets. Cilium inserts an iptables\nprerouting rule that matches on `-m socket --transparent` and redirects\nthe packets to localhost, but it fails to match SNATed IPv6 packets due\nto that missing conntrack lookup.","published_at":"2025-04-16T10:20:37.695000Z","last_modified_at":"2026-07-30T06:22:03.707000Z","cvss_v3_score":10.0,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/6488b96a79a26e19100ad872622f04e93b638d7f","https://git.kernel.org/stable/c/58ab63d3ded2ca6141357a2b24eee8453d0f871d","https://git.kernel.org/stable/c/1ca2169cc19dca893c7aae6af122852097435d16","https://git.kernel.org/stable/c/1ec43100f7123010730b7ddfc3d5c2eac19e70e7","https://git.kernel.org/stable/c/5251041573850e5020cd447374e23010be698898","https://git.kernel.org/stable/c/2bb139e483f8cbe488d19d8c1135ac3615e2668c","https://git.kernel.org/stable/c/41904cbb343d115931d6bf79aa2c815cac4ef72b","https://git.kernel.org/stable/c/221c27259324ec1404f028d4f5a0f2ae7f63ee23","https://git.kernel.org/stable/c/932b32ffd7604fb00b5c57e239a3cc4d901ccf6e"],"vuln_status":"Modified","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-07-31T08:16:56.064491Z"},"effective_severity":"CRITICAL","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"C","value_label":"Changed"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","version_start_inclusive":true,"version_end":"6488b96a79a26e19100ad872622f04e93b638d7f","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:eb31628e37a0a4e01fffd79dcc7f815d2357f53a:6488b96a79a26e19100ad872622f04e93b638d7f"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","version_start_inclusive":true,"version_end":"58ab63d3ded2ca6141357a2b24eee8453d0f871d","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:eb31628e37a0a4e01fffd79dcc7f815d2357f53a:58ab63d3ded2ca6141357a2b24eee8453d0f871d"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","version_start_inclusive":true,"version_end":"1ca2169cc19dca893c7aae6af122852097435d16","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:eb31628e37a0a4e01fffd79dcc7f815d2357f53a:1ca2169cc19dca893c7aae6af122852097435d16"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","version_start_inclusive":true,"version_end":"1ec43100f7123010730b7ddfc3d5c2eac19e70e7","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:eb31628e37a0a4e01fffd79dcc7f815d2357f53a:1ec43100f7123010730b7ddfc3d5c2eac19e70e7"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","version_start_inclusive":true,"version_end":"5251041573850e5020cd447374e23010be698898","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:eb31628e37a0a4e01fffd79dcc7f815d2357f53a:5251041573850e5020cd447374e23010be698898"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","version_start_inclusive":true,"version_end":"2bb139e483f8cbe488d19d8c1135ac3615e2668c","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:eb31628e37a0a4e01fffd79dcc7f815d2357f53a:2bb139e483f8cbe488d19d8c1135ac3615e2668c"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","version_start_inclusive":true,"version_end":"41904cbb343d115931d6bf79aa2c815cac4ef72b","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:eb31628e37a0a4e01fffd79dcc7f815d2357f53a:41904cbb343d115931d6bf79aa2c815cac4ef72b"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","version_start_inclusive":true,"version_end":"221c27259324ec1404f028d4f5a0f2ae7f63ee23","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:eb31628e37a0a4e01fffd79dcc7f815d2357f53a:221c27259324ec1404f028d4f5a0f2ae7f63ee23"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"eb31628e37a0a4e01fffd79dcc7f815d2357f53a","version_start_inclusive":true,"version_end":"932b32ffd7604fb00b5c57e239a3cc4d901ccf6e","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:eb31628e37a0a4e01fffd79dcc7f815d2357f53a:932b32ffd7604fb00b5c57e239a3cc4d901ccf6e"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"3.13","version_start_inclusive":true,"version_end":"3.13","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:3.13:3.13"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"3.13","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:3.13"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.4.292","version_start_inclusive":true,"version_end":"5.4.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.4.292:5.4.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.10.236","version_start_inclusive":true,"version_end":"5.10.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.10.236:5.10.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.15.180","version_start_inclusive":true,"version_end":"5.15.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.15.180:5.15.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.1.133","version_start_inclusive":true,"version_end":"6.1.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.1.133:6.1.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.6.86","version_start_inclusive":true,"version_end":"6.6.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.6.86:6.6.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.12.22","version_start_inclusive":true,"version_end":"6.12.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.12.22:6.12.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.13.10","version_start_inclusive":true,"version_end":"6.13.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.13.10:6.13.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.14.1","version_start_inclusive":true,"version_end":"6.14.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.14.1:6.14.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.15","version_start_inclusive":true,"version_end":"*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.15:*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux-kernel","product_name":"Linux 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