212 lines
12 KiB
JSON
212 lines
12 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-2026-98254",
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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": "2026-09-25T10:25:14.331Z",
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"datePublished": "2026-10-06T08:45:20.736Z",
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"dateUpdated": "2026-10-19T09:16:25.551Z"
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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": "2026-10-19T09:16:25.551Z"
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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\nswiotlb: use the adjusted address for the highmem page lookup\n\nswiotlb_bounce() reads the page frame number from the slot's recorded\norig_addr, then advances orig_addr by tlb_offset to reach the address\nthe caller asked about. The highmem branch mixes the two: the offset\nwithin the page comes from the adjusted address, the page from the value\nbefore it.\n\nOnce the adjustment crosses a page boundary the pair no longer describes\none location, and the whole copy lands one page below the intended one\nfor a positive tlb_offset, one above for a negative one. DMA_FROM_DEVICE\nwrites the device data over the wrong page and leaves the intended one\nstale, DMA_TO_DEVICE feeds the device from a page the mapping may not\ncover. Partial syncs through dma_sync_single_range_for_*() are what make\ntlb_offset non-zero.\n\nThe branch test is picked the same way, so a slot recorded in lowmem can\nbe adjusted into highmem and the lowmem path then hands a highmem\naddress to phys_to_virt().\n\nTake both from orig_addr once it is final and keep pfn in the branch\nthat uses it. PhysHighMem() asks the question straight from the address,\nas dma-debug already does."
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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:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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 defect is in swiotlb_bounce(), reached only via __swiotlb_sync_single_for_cpu/_for_device from a driver's dma_sync_single_range_for_*() on a bounced buffer. No protocol message carries malformed input, and a local user can only cause it by doing I/O on a highmem buffer through such a driver.\nAC:L - Not used; the AC line below is the real value.\nPR:L - The attacker needs an ordinary local account to issue I/O whose buffers (user or page-cache pages, which can be highmem) go through an affected device's streaming DMA mapping. No capability check on the swiotlb sync path stands in the way.\nUI:N - Once the attacker's own I/O drives the partial-sync pattern, no victim action is needed. The bounce runs inside the driver's sync call.\nS:U - The bad copy is done by the kernel's own swiotlb code into kernel-managed physical memory. No IOMMU, VM or other boundary is crossed beyond the kernel's own authority.\nC:H - On DMA_TO_DEVICE, memcpy_from_page() uses pfn_to_page(PFN_DOWN(old orig_addr)) and feeds the device a whole neighbouring physical page the mapping does not cover. This can expose unrelated kernel or user data to the device.\nI:H - On DMA_FROM_DEVICE, memcpy_to_page() writes device data over the page next to the intended one, corrupting arbitrary neighbouring memory. Separately, a lowmem slot shifted into highmem sends a highmem address to phys_to_virt() and memcpy() through a bogus pointer.\nA:H - Overwriting an unrelated physical page, or calling memcpy() on a bogus phys_to_virt() pointer for a highmem address, can corrupt kernel state or fault and oops the kernel."
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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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"kernel/dma/swiotlb.c"
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],
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"versions": [
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{
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"version": "5f89468e2f060031cd89fd4287298e0eaf246bf6",
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"lessThan": "6e53b4d6afbde626255805d438cabb1cac482445",
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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": "5f89468e2f060031cd89fd4287298e0eaf246bf6",
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"lessThan": "aa4709813b29db89f2307f968db5d24925dcdeb1",
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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": "5f89468e2f060031cd89fd4287298e0eaf246bf6",
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"lessThan": "0219b72f5c209732b2f03a8cc0d7240b5e428a99",
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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": "5f89468e2f060031cd89fd4287298e0eaf246bf6",
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"lessThan": "b7d7914a9ae3097e63d113007e4fb44d33d515b1",
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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": "e6108147dd91b94d1979b110f265710c254c99d5",
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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": "e77b796eb9b7ca3c1c0d574d0c155f55b59ca8d5",
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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": "5.10.47",
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"lessThan": "5.11",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.12.14",
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"lessThan": "5.13",
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"status": "affected",
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"versionType": "semver"
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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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"kernel/dma/swiotlb.c"
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],
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"versions": [
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{
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"version": "5.13",
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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": "5.13",
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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": "6.12.112",
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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": "6.18.54",
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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": "7.2.8",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.13",
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"versionEndExcluding": "6.12.112"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.13",
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"versionEndExcluding": "7.2.8"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.13",
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"versionEndExcluding": "7.3"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10.47"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.12.14"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/6e53b4d6afbde626255805d438cabb1cac482445"
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},
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{
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"url": "https://git.kernel.org/stable/c/aa4709813b29db89f2307f968db5d24925dcdeb1"
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},
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{
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"url": "https://git.kernel.org/stable/c/0219b72f5c209732b2f03a8cc0d7240b5e428a99"
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},
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{
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"url": "https://git.kernel.org/stable/c/b7d7914a9ae3097e63d113007e4fb44d33d515b1"
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}
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],
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"title": "swiotlb: use the adjusted address for the highmem page lookup",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |