{"api_version":"1","generated_at":"2026-09-04T02:53:01+00:00","cve":"CVE-2026-64280","urls":{"html":"https://cve.report/CVE-2026-64280","api":"https://cve.report/api/cve/CVE-2026-64280.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64280","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64280"},"summary":{"title":"fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()\n\nafu_ioctl_dma_map() accepts a 64-bit length from userspace via\nDFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value\nis passed to afu_dma_pin_pages() where npages is derived as\nlength >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes\nint nr_pages, causing implicit truncation if length is very large.\n\nValidate map.length at the ioctl entry point before calling\nafu_dma_map_region(), rejecting values whose page count exceeds\nINT_MAX.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:08","updated_at":"2026-08-23 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the Linux kernel, the following vulnerability has been resolved:\n\nfpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()\n\nafu_ioctl_dma_map() accepts a 64-bit length from userspace via\nDFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. 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teardown also performs unbounded out-of-bounds pointer reads.\nI:H - The mapping is DMA_BIDIRECTIONAL, permitting writes beyond the pinned buffer, while the oversized unpin operation can corrupt unrelated page reference counts through out-of-bounds page pointers.\nA:H - A zero page-count wrap causes a deterministic pages[0] dereference from a zero-sized allocation, while other wrapped counts can produce an unbounded unpin traversal and kernel crash."}]}],"providerMetadata":{"dateUpdated":"2026-08-23T12:45:39.157Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc"},{"url":"https://git.kernel.org/stable/c/d7e787eee2ea619b6dbb98890472ee73daf2e7fd"},{"url":"https://git.kernel.org/stable/c/a6a3884ff500f04f3088d6d09eec803cd35331a2"},{"url":"https://git.kernel.org/stable/c/16381bda90b261a656ded0568630c1b857b2ebc8"},{"url":"https://git.kernel.org/stable/c/b50e6cd2395cde615f59b624819998d28c0668d6"},{"url":"https://git.kernel.org/stable/c/59070040fd12e0b78d7b4d341d9f9a183237c5ff"},{"url":"https://git.kernel.org/stable/c/fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231"},{"url":"https://git.kernel.org/stable/c/fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27"}],"title":"fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64280","datePublished":"2026-07-25T08:49:23.753Z","dateReserved":"2026-07-19T15:36:31.777Z","dateUpdated":"2026-08-23T12:45:39.157Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:08","lastModifiedDate":"2026-08-23 13:16:31","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2,"impactScore":6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.148","matchCriteriaId":"045A3DD5-C75E-400D-9A00-47E16F528EEF"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.101","matchCriteriaId":"A4402C34-0450-4C2E-B4BF-63320A4A4FF9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.39","matchCriteriaId":"914AE4BC-3D59-4C5A-9DB5-9CE327B429F7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.1.4","matchCriteriaId":"6228DDD6-4557-4AA3-9F43-AB995D471E42"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64280","Ordinal":"1","Title":"fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region","CVE":"CVE-2026-64280","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64280","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nfpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()\n\nafu_ioctl_dma_map() accepts a 64-bit length from userspace via\nDFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value\nis passed to afu_dma_pin_pages() where npages is derived as\nlength >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes\nint nr_pages, causing implicit truncation if length is very large.\n\nValidate map.length at the ioctl entry point before calling\nafu_dma_map_region(), rejecting values whose page count exceeds\nINT_MAX.","Type":"Description","Title":"fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region"}]}}}