{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90030", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.782Z", "datePublished": "2026-09-16T10:33:31.801Z", "dateUpdated": "2026-10-21T12:49:31.009Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:49:31.009Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: clear forceRM when issuing EndTransfer\n\nThe forceRM bit of the DEPCMD register controls the behavior of the\nEndTransfer command used to stop an active transfer. Older DWC3\nprogramming guide revisions recommended setting forceRM=1 when\nissuing EndTransfer. Newer programming guide revisions recommend\nissuing EndTransfer with forceRM cleared.\n\nWith forceRM=1 on DWC_usb31 v2.00a and v2.10a controllers, a transfer\naborted through the ep_dequeue path was observed to remain active\nafter EndTransfer completion. A subsequent StartTransfer issued on the\nsame endpoint triggered writes associated with the aborted transfer.\nThis resulted in an SMMU fault because the transfer buffer had already\nbeen unmapped during EndTransfer command-completion cleanup.\n\nUsing forceRM=0 eliminates the issue. Although older DWC3 programming\nguide revisions recommended setting forceRM=1, no issues are known\nfrom using forceRM=0. Clear forceRM when issuing EndTransfer to provide\nconsistent EndTransfer behavior and align with newer programming guide\nrecommendations." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The documented trigger is dwc3_gadget_ep_dequeue(), reached from FunctionFS via usb_ep_dequeue() on ordinary local syscalls (interrupted read, aio_cancel, close, FUNCTIONFS_DMABUF_DETACH) rather than USB host packet parsing; this matches AV:L used for other f_fs/dwc3 EndXfer bugs (CVE-2024-36977, CVE-2024-36894).\nAC:L - On affected DWC_usb31 controllers the attacker deterministically queues a request, dequeues it so EndTransfer runs with forceRM=1, then queues again so StartTransfer replays DMA to the already-unmapped buffer; no uncontrolled race is involved, and v2.00a/v2.10a hardware is common on Qualcomm phones and embedded boards.\nPR:L - FunctionFS endpoint nodes are routinely delegated to unprivileged gadget daemons (adbd/shell, MTP) via uid=/gid=/fmode=; queue, cancel, and re-queue are ordinary file operations and the dequeue path performs no capability check.\nUI:N - The attacking process performs the queue, dequeue, and re-queue itself; a USB cable being attached is an ambient condition of phones, kiosks, and embedded gadgets, not a separate victim action the attacker must induce.\nS:U - Stale controller DMA targets the transfer buffer the gadget had already mapped in the same kernel; this is not a VM escape or IOMMU-domain bypass, and an SMMU, when present, faults the access rather than being circumvented.\nC:H - The same EndTransfer forceRM mishandling applies to IN endpoints, so after unmap the still-active transfer can DMA-read reused pages onto the USB bus; per kernel UAF guidance this memory-corruption primitive also yields kernel disclosure once backing pages are reallocated.\nI:H - The issue was reproduced as stale DMA writes on an OUT bulk endpoint into a buffer already unmapped during EndTransfer completion cleanup, so leftover or host-supplied data is written into reallocated kernel pages, a DMA use-after-free write primitive suitable for control-flow hijacking.\nA:H - The commit reports an SMMU fault when the controller accesses the already-unmapped transfer buffer, which panics or wedges the USB/IOMMU path; without an IOMMU the same DMA use-after-free likewise oopses or panics the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/dwc3/ep0.c", "drivers/usb/dwc3/gadget.c" ], "versions": [ { "version": "ab99c4be945724b032cc55e05c6738fe1d84bf70", "lessThan": "7a50e138fa28e5ba76b11af66ed41cc300c0f2be", "status": "affected", "versionType": "git" }, { "version": "1e43c86d84fb0503e82a143e017f35421498fc1a", "lessThan": "9f1e57c484f9edeaaa5a27a03ed985e98496e81d", "status": "affected", "versionType": "git" }, { "version": "1e43c86d84fb0503e82a143e017f35421498fc1a", "lessThan": "0afe5c31612de3d18cc6d16e616da4a48ba1e5a2", "status": "affected", "versionType": "git" }, { "version": "1e43c86d84fb0503e82a143e017f35421498fc1a", "lessThan": "e01408ee52fe5cb2d0b43f47f359336af2b6c316", "status": "affected", "versionType": "git" }, { "version": "1e43c86d84fb0503e82a143e017f35421498fc1a", "lessThan": "b58e6200450d350314db0ecda7d6d1bde3281e80", "status": "affected", "versionType": "git" }, { "version": "6.6.37", "lessThan": "6.6.160", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/dwc3/ep0.c", "drivers/usb/dwc3/gadget.c" ], "versions": [ { "version": "6.9", "status": "affected" }, { "version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "6.6.37", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7a50e138fa28e5ba76b11af66ed41cc300c0f2be" }, { "url": "https://git.kernel.org/stable/c/9f1e57c484f9edeaaa5a27a03ed985e98496e81d" }, { "url": "https://git.kernel.org/stable/c/0afe5c31612de3d18cc6d16e616da4a48ba1e5a2" }, { "url": "https://git.kernel.org/stable/c/e01408ee52fe5cb2d0b43f47f359336af2b6c316" }, { "url": "https://git.kernel.org/stable/c/b58e6200450d350314db0ecda7d6d1bde3281e80" } ], "title": "usb: dwc3: clear forceRM when issuing EndTransfer", "x_generator": { "engine": "bippy-1.2.0" } } } }