{"cve":{"cve_id":"CVE-2026-53221","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":null,"epss_percentile":null,"epss_as_of":null,"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()\n\nIn vti6_tnl_lookup(), when an exact match for a tunnel fails,\nthe code falls back to searching for wildcard tunnels:\n\n- Tunnels matching the packet's local address, with any remote address\n  wildcard remote).\n\n- Tunnels matching the packet's remote address, with any local address\n  (wildcard local).\n\nHowever, vti6 stores all these different types of tunnels in the same\nhash table (ip6n->tnls_r_l) prone to hash collisions.\n\nThe bug is that the fallback search loops in vti6_tnl_lookup() were\nmissing checks to ensure that the candidate tunnel actually has\na wildcard address.","published_at":"2026-06-25T08:39:23.177000Z","last_modified_at":null,"cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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/c327fa4fca31415431202e063767a7ae342e19c6","https://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8","https://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646","https://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1","https://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d","https://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b","https://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d","https://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9"],"vuln_status":null,"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":"2026-06-28T17:55:28.590503Z","updated_at":"2026-06-28T23:30:51.545322Z"},"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":"U","value_label":"Unchanged"},{"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":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","version_start_inclusive":true,"version_end":"c327fa4fca31415431202e063767a7ae342e19c6","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:fbe68ee87522f6eaa10f9076c0a7117e1613f2f7:c327fa4fca31415431202e063767a7ae342e19c6"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","version_start_inclusive":true,"version_end":"fc657ac0767c49839b3ef0b08dc0953ca30883f8","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:fbe68ee87522f6eaa10f9076c0a7117e1613f2f7:fc657ac0767c49839b3ef0b08dc0953ca30883f8"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","version_start_inclusive":true,"version_end":"47fb3c2b4203556308e64354b3e78f2ce221d646","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:fbe68ee87522f6eaa10f9076c0a7117e1613f2f7:47fb3c2b4203556308e64354b3e78f2ce221d646"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","version_start_inclusive":true,"version_end":"f513f308cc4bdb4530d033431592ffbc29b7fca1","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:fbe68ee87522f6eaa10f9076c0a7117e1613f2f7:f513f308cc4bdb4530d033431592ffbc29b7fca1"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","version_start_inclusive":true,"version_end":"90fd4513315ca07da99cfd8549d3e553a7160f0d","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:fbe68ee87522f6eaa10f9076c0a7117e1613f2f7:90fd4513315ca07da99cfd8549d3e553a7160f0d"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","version_start_inclusive":true,"version_end":"2abfb19bbb81958714ad1d43ebeb65b30394184b","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:fbe68ee87522f6eaa10f9076c0a7117e1613f2f7:2abfb19bbb81958714ad1d43ebeb65b30394184b"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","version_start_inclusive":true,"version_end":"2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:fbe68ee87522f6eaa10f9076c0a7117e1613f2f7:2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","version_start_inclusive":true,"version_end":"a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:fbe68ee87522f6eaa10f9076c0a7117e1613f2f7:a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"3.19","version_start_inclusive":true,"version_end":"3.19","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:3.19:3.19"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"3.19","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:3.19"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.10.259","version_start_inclusive":true,"version_end":"5.10.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.10.259:5.10.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.15.210","version_start_inclusive":true,"version_end":"5.15.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.15.210:5.15.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.1.176","version_start_inclusive":true,"version_end":"6.1.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.1.176:6.1.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.6.143","version_start_inclusive":true,"version_end":"6.6.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.6.143:6.6.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.12.94","version_start_inclusive":true,"version_end":"6.12.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.12.94:6.12.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.18.36","version_start_inclusive":true,"version_end":"6.18.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.18.36:6.18.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.0.13","version_start_inclusive":true,"version_end":"7.0.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.0.13:7.0.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.1","version_start_inclusive":true,"version_end":"*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.1:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-25T08:39:23.177000Z","label":"CVE published","source":null}]}