{"api_version":"1","generated_at":"2026-07-06T20:56:18+00:00","cve":"CVE-2026-53219","urls":{"html":"https://cve.report/CVE-2026-53219","api":"https://cve.report/api/cve/CVE-2026-53219.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53219","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53219"},"summary":{"title":"netfilter: x_tables: avoid leaking percpu counter pointers","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: avoid leaking percpu counter pointers\n\nThe native and compat get-entries paths copy the fixed rule entry header\nfrom the kernelized rule blob to userspace before overwriting the entry's\ncounter fields with a sanitized counter snapshot.\n\nOn SMP kernels, entry->counters.pcnt contains the percpu allocation\naddress used by x_tables rule counters. A caller can provide a userspace\nbuffer that faults during the initial fixed-header copy after pcnt has\nbeen copied but before the later sanitized counter copy runs. The syscall\nthen returns -EFAULT while leaving the raw percpu pointer in userspace.\n\nCopy only the fixed entry prefix before counters from the kernelized rule\nblob, then copy the sanitized counter snapshot into the counter field.\nApply this ordering to the IPv4, IPv6, and ARP native and compat\nget-entries implementations so a fault cannot expose the internal percpu\ncounter pointer.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-25 09:16:39","updated_at":"2026-07-02 20:52:20"},"problem_types":["NVD-CWE-noinfo"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f","name":"https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c","name":"https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e","name":"https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c","name":"https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe","name":"https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5","name":"https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb","name":"https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45","name":"https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53219","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53219","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f b74ba3343eb44b2cbf7e9665918c287df1d52ebb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f 0b35dc8527ccc16b7dc34e8a3164313e68cd4e45 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f b28e2fcad3db7e8687b15bc20bced26b5b7c920e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 71ae0dff02d756e4d2ca710b79f2ff5390029a5f a0d16941adf3a501956d74aefd8d6e217906e79c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2026","cve_id":"53219","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"53219","cve":"CVE-2026-53219","epss":"0.001280000","percentile":"0.027880000","score_date":"2026-07-04","updated_at":"2026-07-05 00:02:27"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv4/netfilter/arp_tables.c","net/ipv4/netfilter/ip_tables.c","net/ipv6/netfilter/ip6_tables.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b74ba3343eb44b2cbf7e9665918c287df1d52ebb","status":"affected","version":"71ae0dff02d756e4d2ca710b79f2ff5390029a5f","versionType":"git"},{"lessThan":"0b35dc8527ccc16b7dc34e8a3164313e68cd4e45","status":"affected","version":"71ae0dff02d756e4d2ca710b79f2ff5390029a5f","versionType":"git"},{"lessThan":"b28e2fcad3db7e8687b15bc20bced26b5b7c920e","status":"affected","version":"71ae0dff02d756e4d2ca710b79f2ff5390029a5f","versionType":"git"},{"lessThan":"a0d16941adf3a501956d74aefd8d6e217906e79c","status":"affected","version":"71ae0dff02d756e4d2ca710b79f2ff5390029a5f","versionType":"git"},{"lessThan":"8d67e42ad3b1a95a152541015a07110e06992d6c","status":"affected","version":"71ae0dff02d756e4d2ca710b79f2ff5390029a5f","versionType":"git"},{"lessThan":"08a3e218064db11f154ad9ad5541751ea7f34ebe","status":"affected","version":"71ae0dff02d756e4d2ca710b79f2ff5390029a5f","versionType":"git"},{"lessThan":"fb0521aff1e10e300d89725cc439d3ea74c828c5","status":"affected","version":"71ae0dff02d756e4d2ca710b79f2ff5390029a5f","versionType":"git"},{"lessThan":"f7f2fbb0e893a0238dc464f8d8c0f5609bec584f","status":"affected","version":"71ae0dff02d756e4d2ca710b79f2ff5390029a5f","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/netfilter/arp_tables.c","net/ipv4/netfilter/ip_tables.c","net/ipv6/netfilter/ip6_tables.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.2"},{"lessThan":"4.2","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":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"4.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: avoid leaking percpu counter pointers\n\nThe native and compat get-entries paths copy the fixed rule entry header\nfrom the kernelized rule blob to userspace before overwriting the entry's\ncounter fields with a sanitized counter snapshot.\n\nOn SMP kernels, entry->counters.pcnt contains the percpu allocation\naddress used by x_tables rule counters. A caller can provide a userspace\nbuffer that faults during the initial fixed-header copy after pcnt has\nbeen copied but before the later sanitized counter copy runs. The syscall\nthen returns -EFAULT while leaving the raw percpu pointer in userspace.\n\nCopy only the fixed entry prefix before counters from the kernelized rule\nblob, then copy the sanitized counter snapshot into the counter field.\nApply this ordering to the IPv4, IPv6, and ARP native and compat\nget-entries implementations so a fault cannot expose the internal percpu\ncounter pointer."}],"providerMetadata":{"dateUpdated":"2026-06-25T08:39:21.730Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb"},{"url":"https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45"},{"url":"https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e"},{"url":"https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c"},{"url":"https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c"},{"url":"https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe"},{"url":"https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5"},{"url":"https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f"}],"title":"netfilter: x_tables: avoid leaking percpu counter 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20:52:20","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.10.259","matchCriteriaId":"E9C21CCE-47FD-40BA-8A95-0D9E2F98FCA6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.210","matchCriteriaId":"5E938CDF-D1C4-43D0-98DC-9E11B6B55801"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.176","matchCriteriaId":"C4446623-5F2B-4DD8-8666-9FAAC285A757"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.143","matchCriteriaId":"9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.94","matchCriteriaId":"85421C0C-ABDE-4357-971C-67F9087DE1B9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.36","matchCriteriaId":"389025D2-958D-41BD-BD96-70ED1033A9F3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.0.13","matchCriteriaId":"6A64BF9F-3BCA-42FD-98CB-8F03474D2B1E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*","matchCriteriaId":"B1EF7059-E670-45F4-B422-54C40FA86390"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*","matchCriteriaId":"0D38F0BF-A728-4133-A358-D44A2F7EE6D6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*","matchCriteriaId":"EC732D08-5F7B-46D9-B154-E60C7F4F0A97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*","matchCriteriaId":"E5910A9D-F60A-409A-B486-FE66BFEBA9B9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*","matchCriteriaId":"81DFF19E-9CF8-49C6-8C36-1E4038622933"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*","matchCriteriaId":"B0E8FC71-3952-444C-83E9-718DBBBEC615"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:*","matchCriteriaId":"1039E95A-8CC3-4C88-8FF9-5C08EEB861C9"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53219","Ordinal":"1","Title":"netfilter: x_tables: avoid leaking percpu counter pointers","CVE":"CVE-2026-53219","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53219","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: avoid leaking percpu counter pointers\n\nThe native and compat get-entries paths copy the fixed rule entry header\nfrom the kernelized rule blob to userspace before overwriting the entry's\ncounter fields with a sanitized counter snapshot.\n\nOn SMP kernels, entry->counters.pcnt contains the percpu allocation\naddress used by x_tables rule counters. A caller can provide a userspace\nbuffer that faults during the initial fixed-header copy after pcnt has\nbeen copied but before the later sanitized counter copy runs. The syscall\nthen returns -EFAULT while leaving the raw percpu pointer in userspace.\n\nCopy only the fixed entry prefix before counters from the kernelized rule\nblob, then copy the sanitized counter snapshot into the counter field.\nApply this ordering to the IPv4, IPv6, and ARP native and compat\nget-entries implementations so a fault cannot expose the internal percpu\ncounter pointer.","Type":"Description","Title":"netfilter: x_tables: avoid leaking percpu counter pointers"}]}}}