264 lines
14 KiB
JSON
264 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64280",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T15:36:31.777Z",
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"datePublished": "2026-07-25T08:49:23.753Z",
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"dateUpdated": "2026-08-23T12:45:39.157Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-23T12:45:39.157Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/fpga/dfl-afu-main.c"
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],
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"versions": [
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{
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"version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
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"lessThan": "5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc",
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"status": "affected",
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},
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"version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
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"lessThan": "d7e787eee2ea619b6dbb98890472ee73daf2e7fd",
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"status": "affected",
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},
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{
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"version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
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"status": "affected",
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},
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{
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"version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
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"lessThan": "16381bda90b261a656ded0568630c1b857b2ebc8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
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"lessThan": "b50e6cd2395cde615f59b624819998d28c0668d6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
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"lessThan": "59070040fd12e0b78d7b4d341d9f9a183237c5ff",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
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"lessThan": "fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fa8dda1edef9ebc3af467c644c5533ac97171e12",
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"lessThan": "fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/fpga/dfl-afu-main.c"
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],
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"versions": [
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{
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"version": "4.19",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.19",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.266",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.217",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.184",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.148",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.101",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.39",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.4",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"operator": "OR",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.19",
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"versionEndExcluding": "5.10.266"
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},
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"url": "https://git.kernel.org/stable/c/a6a3884ff500f04f3088d6d09eec803cd35331a2"
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{
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"url": "https://git.kernel.org/stable/c/16381bda90b261a656ded0568630c1b857b2ebc8"
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},
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{
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"url": "https://git.kernel.org/stable/c/b50e6cd2395cde615f59b624819998d28c0668d6"
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},
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{
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"url": "https://git.kernel.org/stable/c/59070040fd12e0b78d7b4d341d9f9a183237c5ff"
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{
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"url": "https://git.kernel.org/stable/c/fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231"
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},
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{
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"url": "https://git.kernel.org/stable/c/fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27"
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}
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],
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"title": "fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |