{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64280", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.777Z", "datePublished": "2026-07-25T08:49:23.753Z", "dateUpdated": "2026-08-23T12:45:39.157Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:45:39.157Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is reached locally through DFL_FPGA_PORT_DMA_MAP on a /dev/dfl-port.* character device.\nAC:L - A page-aligned length whose page count wraps to zero or a small positive integer deterministically triggers the mismatch; no race or condition outside the attacker’s control is required.\nPR:L - The ioctl contains no capability or namespace privilege check, so any unprivileged user granted access to the port device can trigger it.\nUI:N - The attacker independently opens the device and submits the malicious ioctl without any victim action.\nS:C - The oversized DMA mapping can cross the IOMMU-enforced boundary between the assigned user buffer and host physical memory, affecting kernel and other-user resources.\nC:H - A small positive page-count wrap can create an enormous DMA-readable mapping after pinning only a few pages, exposing host memory beyond the authorized buffer; 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/fpga/dfl-afu-main.c" ], "versions": [ { "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12", "lessThan": "5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc", "status": "affected", "versionType": "git" }, { "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12", "lessThan": "d7e787eee2ea619b6dbb98890472ee73daf2e7fd", "status": "affected", "versionType": "git" }, { "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12", "lessThan": "a6a3884ff500f04f3088d6d09eec803cd35331a2", "status": "affected", "versionType": "git" }, { "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12", "lessThan": "16381bda90b261a656ded0568630c1b857b2ebc8", "status": "affected", "versionType": "git" }, { "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12", "lessThan": "b50e6cd2395cde615f59b624819998d28c0668d6", "status": "affected", "versionType": "git" }, { "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12", "lessThan": "59070040fd12e0b78d7b4d341d9f9a183237c5ff", "status": "affected", "versionType": "git" }, { "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12", "lessThan": "fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231", "status": "affected", "versionType": "git" }, { "version": "fa8dda1edef9ebc3af467c644c5533ac97171e12", "lessThan": "fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/fpga/dfl-afu-main.c" ], "versions": [ { "version": "4.19", "status": "affected" }, { "version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.266", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "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": "4.19", "versionEndExcluding": "5.10.266" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.15.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.1.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }