EUVD-2026-80638
GHSA-xj76-5wmq-jmw6
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local gadget-path trigger (AV:L, PR:L); hardware-revision- and DMA-timing-dependent (AC:H); impact is an SMMU-fault crash only (C:N/I:N/A:H).
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
7DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
usb: dwc3: clear forceRM when issuing EndTransfer
The forceRM bit of the DEPCMD register controls the behavior of the EndTransfer command used to stop an active transfer. Older DWC3 programming guide revisions recommended setting forceRM=1 when issuing EndTransfer. Newer programming guide revisions recommend issuing EndTransfer with forceRM cleared.
With forceRM=1 on DWC_usb31 v2.00a and v2.10a controllers, a transfer aborted through the ep_dequeue path was observed to remain active after EndTransfer completion. A subsequent StartTransfer issued on the same endpoint triggered writes associated with the aborted transfer. This resulted in an SMMU fault because the transfer buffer had already been unmapped during EndTransfer command-completion cleanup.
Using forceRM=0 eliminates the issue. Although older DWC3 programming guide revisions recommended setting forceRM=1, no issues are known from using forceRM=0. Clear forceRM when issuing EndTransfer to provide consistent EndTransfer behavior and align with newer programming guide recommendations.
AnalysisAI
Incorrect forceRM handling during EndTransfer in the Linux kernel's dwc3 USB gadget driver can leave a transfer aborted via ep_dequeue still active on Synopsys DWC_usb31 v2.00a/v2.10a controllers, so a later StartTransfer on the same endpoint writes into a DMA buffer that was already unmapped and raises an SMMU/IOMMU fault, producing a denial-of-service condition. Only systems running a vulnerable kernel with those specific controller revisions in USB gadget mode behind an SMMU are affected, and exploitation requires local authenticated access (CVSS PR:L) to the gadget/endpoint path rather than remote or crafted network input. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a system using a Synopsys DesignWare DWC_usb31 controller at revisions v2.00a or v2.10a in USB gadget mode, with an SMMU/IOMMU enforcing DMA mappings. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS of 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) overstates real-world impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to Linux 6.18.51 or 7.2.5 (mainline fix in 7.3-rc2), which contain the upstream commits that clear forceRM before issuing EndTransfer; the individual patches are https://git.kernel.org/stable/c/e01408ee52fe5cb2d0b43f47f359336af2b6c316, https://git.kernel.org/stable/c/0afe5c31612de3d18cc6d16e616da4a48ba1e5a2 and https://git.kernel.org/stable/c/b58e6200450d350314db0ecda7d6d1bde3281e80. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Linux kernels with Synopsys DWC_usb31 v2.00a or v2.10a controllers in USB gadget mode behind an SMMU to determine exposure. …
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Same technique Denial Of Service
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External POC / Exploit Code
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