222 lines
13 KiB
JSON
222 lines
13 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-2026-93042",
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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": "2026-09-17T15:57:05.657Z",
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"datePublished": "2026-09-17T16:10:34.911Z",
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"dateUpdated": "2026-10-30T12:35:46.423Z"
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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": "2026-10-30T12:35:46.423Z"
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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\ndmaengine: dw-edma: Terminate all descriptors without callbacks\n\nThe DMA Engine client documentation says in the \"Terminate APIs\" section\nof Documentation/driver-api/dmaengine/client.rst:\n\n\"No callback functions will be called for any incomplete transfers.\"\n\ndw-edma instead calls vchan_cookie_complete() when a deferred STOP reaches\nthe interrupt handler. This schedules a callback for the active descriptor\nand leaves other issued or submitted descriptors queued. A late callback\nafter dmaengine_terminate_sync() can dereference client state that has\nalready been freed, while leftover descriptors may later restart into\nreused buffers or leak.\n\nMove all issued and submitted descriptors to the terminated list whenever\ntermination completes. For a pending STOP, do this from both the DONE and\nABORT paths. Complete their cookies in order without scheduling callbacks.\n\nA STOP can remain pending until the running transfer raises an\ninterrupt. Make device_synchronize() wait for such a pending STOP to\ncomplete before releasing terminated descriptors. Reuse it from\nfree_chan_resources(), then release the remaining virt-dma resources.\nSleep instead of busy-polling while waiting, and warn if the existing\ntimeout expires."
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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:A/AC:L/PR:N/UI:N/S:U/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:A - On DesignWare PCIe endpoint SoCs the host starts eDMA via pci_epf_mhi_edma_read()/write() (MHI transfers ≥4K), nvmet_pci_epf_dma_transfer(), or pci_epf_test BAR COMMAND_READ|WRITE with FLAG_USE_DMA, then those clients call dmaengine_terminate_sync() on the local dw-edma channel; the trigger is PCIe-link peer traffic, not a local syscall or a routable protocol.\nAC:L - pci_epf_mhi_edma_read() waits only 1000ms then calls dmaengine_terminate_sync(); a host that issues a ≥4K MHI DMA and stalls it hits that timeout while EDMA_ST_BUSY. Vulnerable dw_edma_device_terminate_all() only stores EDMA_REQ_STOP and returns 0 because device_synchronize was unimplemented, so the host can drop the stall and deliver the DONE/ABORT IRQ itself.\nPR:N - pci_epf_mhi_edma_read()/write() and nvmet_pci_epf_dma_transfer() do not authenticate the PCIe host; MHI TREs, NVMe I/O, or BAR command-register COMMAND_READ/WRITE writes from the upstream port suffice, with no Linux uid, capability, or user-namespace check on the endpoint.\nUI:N - The PCIe host starts the MHI/NVMe/epf-test DMA and forces the client's terminate-on-timeout path itself; no victim mount, file open, or other interactive step is required once the endpoint function is already bound.\nS:U - The late vchan_complete() callback UAF and leftover desc_issued restarts corrupt callback state and DMA buffers inside the same endpoint kernel that hosts dw-edma; that is in-kernel memory corruption, not a KVM/Xen guest escape or an IOMMU policy bypass.\nC:H - dw_edma_done_interrupt()'s EDMA_REQ_STOP path calls vchan_cookie_complete(), so vchan_complete() can invoke pci_epf_mhi_dma_callback() after pci_epf_mhi_edma_read() returned and its DECLARE_COMPLETION_ONSTACK died; leftover issued descriptors can also dw_edma_start_transfer() MEM_TO_DEV from reused kernel pages into host memory.\nI:H - After dma_unmap_single() in the MHI/nvmet timeout path, leftover desc_issued entries stay queued, so a later issue_pending() runs dw_edma_start_transfer() DEV_TO_MEM into those unmapped/reused pages, and the late callback UAF likewise corrupts kernel state, giving a write primitive.\nA:H - The STOP-path vchan_cookie_complete() UAF in vchan_complete() and DMA into buffers already unmapped by pci_epf_mhi_edma_read() or nvmet_pci_epf_dma_transfer() oops or panic the endpoint kernel, as the fix commit describes for a late callback after dmaengine_terminate_sync()."
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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/dma/dw-edma/dw-edma-core.c"
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],
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"versions": [
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{
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"version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf",
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"lessThan": "da56839aced48ecb70033962d7ea98f55b0c5656",
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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": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf",
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"lessThan": "65e387b95d3855aa894ac729e1778e5bcb9083cb",
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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": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf",
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"lessThan": "4793f9099a1cadf4e37f3a03d524af6bce88a0ea",
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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": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf",
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"lessThan": "be87d86537de7ea6fd025f41033d2faff880973f",
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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": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf",
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"lessThan": "f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7",
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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": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf",
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"lessThan": "99109a51efd28c9a661fbfb9469b023c517b31d1",
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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/dma/dw-edma/dw-edma-core.c"
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],
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"versions": [
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{
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"version": "5.3",
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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": "5.3",
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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": "6.1.191",
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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": "6.6.157",
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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": "6.12.110",
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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": "6.18.52",
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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": "7.2.6",
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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": "5.3",
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"versionEndExcluding": "6.1.191"
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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": "5.3",
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"versionEndExcluding": "6.6.157"
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"versionStartIncluding": "5.3",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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/da56839aced48ecb70033962d7ea98f55b0c5656"
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},
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{
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"url": "https://git.kernel.org/stable/c/65e387b95d3855aa894ac729e1778e5bcb9083cb"
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},
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{
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"url": "https://git.kernel.org/stable/c/4793f9099a1cadf4e37f3a03d524af6bce88a0ea"
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},
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{
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"url": "https://git.kernel.org/stable/c/be87d86537de7ea6fd025f41033d2faff880973f"
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},
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{
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"url": "https://git.kernel.org/stable/c/f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7"
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},
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{
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"url": "https://git.kernel.org/stable/c/99109a51efd28c9a661fbfb9469b023c517b31d1"
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}
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],
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"title": "dmaengine: dw-edma: Terminate all descriptors without callbacks",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |