{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64355", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.782Z", "datePublished": "2026-07-25T08:50:13.410Z", "dateUpdated": "2026-08-17T04:54:01.161Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:54:01.161Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:N - A remote peer can send an oversized packet that a fragment-capable NIC represents as a multi-buffer XDP frame, reaching the vulnerable devmap broadcast clone path on a configured forwarding host.\nAC:L - No race or uncontrollable timing condition is required; fragmented packets reliably enter the faulty clone path and can be sent repeatedly.\nPR:N - Although initial-namespace CAP_BPF and CAP_NET_ADMIN are needed to configure the XDP deployment, the attacker sending packets through the already-configured unauthenticated data path needs no privileges.\nUI:N - Packet reception and XDP processing occur automatically without victim action.\nS:U - The corruption compromises resources governed by the same host-kernel security authority and does not inherently cross a VM, IOMMU, or other distinct boundary.\nC:H - Uninitialized fragment descriptors are consumed as page references and can be used by scatter-gather transmitters for unintended DMA mappings, potentially exposing arbitrary kernel memory.\nI:H - An uninitialized fragment count can overrun fixed-size driver arrays, while bogus page references can cause invalid refcount decrements, premature frees, and exploitable kernel memory corruption.\nA:H - Invalid fragment metadata can fault during DMA mapping, transmission, or frame return and cause a kernel oops or panic; an attacker can trigger this repeatedly." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/devmap.c" ], "versions": [ { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "47baddc856ae7e93a565dd9deeb797999b179466", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "07a4c11ee8ef4abcb39d922e9e410ae269671cdf", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "bccbab36ff228e0825eb85d9b0f9b8434cd0a399", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "c5b4f5efcb55c1af3fe44ff712d31b7fb098a831", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "a9bb2d9c798cb62a4050a991c27b752770c33afe", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "51d07c12ca411e692c424ecdabf077f1e61a61be", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "aa496720618f1a6054f1c870bf10b4f6c99bf656", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/devmap.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }