{"api_version":"1","generated_at":"2026-07-28T15:19:59+00:00","cve":"CVE-2026-64355","urls":{"html":"https://cve.report/CVE-2026-64355","api":"https://cve.report/api/cve/CVE-2026-64355.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64355","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64355"},"summary":{"title":"bpf: Reject fragmented frames in devmap","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject fragmented frames in devmap\n\nDevmap broadcast redirects clone the packet for all but the last\ndestination.\n\nFor native XDP, that clone path copies only the linear xdp_frame data,\nwhile fragmented frames keep skb_shared_info in tailroom outside the\nlinear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but\nwithout valid frag metadata, and the later free path can interpret\nuninitialized tail data as skb_shared_info, leading to an out-of-bounds\naccess during frame return.\n\nReject fragmented native XDP frames in dev_map_enqueue_clone().\n\nAdd the same restriction to the generic XDP clone path in\ndev_map_redirect_clone(). Generic XDP represents fragmented packets as\nnonlinear skbs, and rejecting them here keeps clone-based broadcast\nsupport aligned between native and generic XDP.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:17","updated_at":"2026-07-27 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the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject fragmented frames in devmap\n\nDevmap broadcast redirects clone the packet for all but the last\ndestination.\n\nFor native XDP, that clone path copies only the linear xdp_frame data,\nwhile fragmented frames keep skb_shared_info in tailroom outside the\nlinear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but\nwithout valid frag metadata, and the later free path can interpret\nuninitialized tail data as skb_shared_info, leading to an out-of-bounds\naccess during frame return.\n\nReject fragmented native XDP frames in dev_map_enqueue_clone().\n\nAdd the same restriction to the generic XDP clone path in\ndev_map_redirect_clone(). Generic XDP represents fragmented packets as\nnonlinear skbs, and rejecting them here keeps clone-based broadcast\nsupport aligned between native and generic XDP."}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-27T04:59:54.016Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/47baddc856ae7e93a565dd9deeb797999b179466"},{"url":"https://git.kernel.org/stable/c/07a4c11ee8ef4abcb39d922e9e410ae269671cdf"},{"url":"https://git.kernel.org/stable/c/bccbab36ff228e0825eb85d9b0f9b8434cd0a399"},{"url":"https://git.kernel.org/stable/c/c5b4f5efcb55c1af3fe44ff712d31b7fb098a831"},{"url":"https://git.kernel.org/stable/c/a9bb2d9c798cb62a4050a991c27b752770c33afe"},{"url":"https://git.kernel.org/stable/c/51d07c12ca411e692c424ecdabf077f1e61a61be"},{"url":"https://git.kernel.org/stable/c/aa496720618f1a6054f1c870bf10b4f6c99bf656"}],"title":"bpf: Reject fragmented frames in devmap","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64355","datePublished":"2026-07-25T08:50:13.410Z","dateReserved":"2026-07-19T15:36:31.782Z","dateUpdated":"2026-07-27T04:59:54.016Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:17","lastModifiedDate":"2026-07-27 05:16:43","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64355","Ordinal":"1","Title":"bpf: Reject fragmented frames in devmap","CVE":"CVE-2026-64355","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64355","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject fragmented frames in devmap\n\nDevmap broadcast redirects clone the packet for all but the last\ndestination.\n\nFor native XDP, that clone path copies only the linear xdp_frame data,\nwhile fragmented frames keep skb_shared_info in tailroom outside the\nlinear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but\nwithout valid frag metadata, and the later free path can interpret\nuninitialized tail data as skb_shared_info, leading to an out-of-bounds\naccess during frame return.\n\nReject fragmented native XDP frames in dev_map_enqueue_clone().\n\nAdd the same restriction to the generic XDP clone path in\ndev_map_redirect_clone(). Generic XDP represents fragmented packets as\nnonlinear skbs, and rejecting them here keeps clone-based broadcast\nsupport aligned between native and generic XDP.","Type":"Description","Title":"bpf: Reject fragmented frames in devmap"}]}}}