{"api_version":"1","generated_at":"2026-06-25T17:31:28+00:00","cve":"CVE-2026-53221","urls":{"html":"https://cve.report/CVE-2026-53221","api":"https://cve.report/api/cve/CVE-2026-53221.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53221","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53221"},"summary":{"title":"ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()","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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:39","updated_at":"2026-06-25 09:16:39"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1","name":"https://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b","name":"https://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9","name":"https://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8","name":"https://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646","name":"https://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d","name":"https://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6","name":"https://git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d","name":"https://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53221","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53221","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 c327fa4fca31415431202e063767a7ae342e19c6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 fc657ac0767c49839b3ef0b08dc0953ca30883f8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 47fb3c2b4203556308e64354b3e78f2ce221d646 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 f513f308cc4bdb4530d033431592ffbc29b7fca1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 90fd4513315ca07da99cfd8549d3e553a7160f0d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 2abfb19bbb81958714ad1d43ebeb65b30394184b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv6/ip6_vti.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"c327fa4fca31415431202e063767a7ae342e19c6","status":"affected","version":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","versionType":"git"},{"lessThan":"fc657ac0767c49839b3ef0b08dc0953ca30883f8","status":"affected","version":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","versionType":"git"},{"lessThan":"47fb3c2b4203556308e64354b3e78f2ce221d646","status":"affected","version":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","versionType":"git"},{"lessThan":"f513f308cc4bdb4530d033431592ffbc29b7fca1","status":"affected","version":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","versionType":"git"},{"lessThan":"90fd4513315ca07da99cfd8549d3e553a7160f0d","status":"affected","version":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","versionType":"git"},{"lessThan":"2abfb19bbb81958714ad1d43ebeb65b30394184b","status":"affected","version":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","versionType":"git"},{"lessThan":"2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d","status":"affected","version":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","versionType":"git"},{"lessThan":"a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9","status":"affected","version":"fbe68ee87522f6eaa10f9076c0a7117e1613f2f7","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv6/ip6_vti.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.19"},{"lessThan":"3.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.94","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"3.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"3.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"3.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"3.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"3.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"3.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"3.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"3.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-06-25T08:39:23.177Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/c327fa4fca31415431202e063767a7ae342e19c6"},{"url":"https://git.kernel.org/stable/c/fc657ac0767c49839b3ef0b08dc0953ca30883f8"},{"url":"https://git.kernel.org/stable/c/47fb3c2b4203556308e64354b3e78f2ce221d646"},{"url":"https://git.kernel.org/stable/c/f513f308cc4bdb4530d033431592ffbc29b7fca1"},{"url":"https://git.kernel.org/stable/c/90fd4513315ca07da99cfd8549d3e553a7160f0d"},{"url":"https://git.kernel.org/stable/c/2abfb19bbb81958714ad1d43ebeb65b30394184b"},{"url":"https://git.kernel.org/stable/c/2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d"},{"url":"https://git.kernel.org/stable/c/a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9"}],"title":"ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53221","datePublished":"2026-06-25T08:39:23.177Z","dateReserved":"2026-06-09T07:44:35.392Z","dateUpdated":"2026-06-25T08:39:23.177Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-25 09:16:39","lastModifiedDate":"2026-06-25 09:16:39","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53221","Ordinal":"1","Title":"ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()","CVE":"CVE-2026-53221","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53221","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()"}]}}}