CVE-2026-93042

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93042", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T15:57:05.657Z", "datePublished": "2026-09-17T16:10:34.911Z", "dateUpdated": "2026-10-30T12:35:46.423Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:35:46.423Z"}, "descriptions": [{"lang": "en", "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - On DesignWare PCIe endpoint SoCs the host starts eDMA via pci_epf_mhi_edma_read()/write() (MHI transfers \u22654K), 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 \u22654K 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()."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/dma/dw-edma/dw-edma-core.c"], "versions": [{"version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "lessThan": "da56839aced48ecb70033962d7ea98f55b0c5656", "status": "affected", "versionType": "git"}, {"version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "lessThan": "65e387b95d3855aa894ac729e1778e5bcb9083cb", "status": "affected", "versionType": "git"}, {"version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "lessThan": "4793f9099a1cadf4e37f3a03d524af6bce88a0ea", "status": "affected", "versionType": "git"}, {"version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "lessThan": "be87d86537de7ea6fd025f41033d2faff880973f", "status": "affected", "versionType": "git"}, {"version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "lessThan": "f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7", "status": "affected", "versionType": "git"}, {"version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "lessThan": "99109a51efd28c9a661fbfb9469b023c517b31d1", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/dma/dw-edma/dw-edma-core.c"], "versions": [{"version": "5.3", "status": "affected"}, {"version": "0", "lessThan": "5.3", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "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": "5.3", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/da56839aced48ecb70033962d7ea98f55b0c5656"}, {"url": "https://git.kernel.org/stable/c/65e387b95d3855aa894ac729e1778e5bcb9083cb"}, {"url": "https://git.kernel.org/stable/c/4793f9099a1cadf4e37f3a03d524af6bce88a0ea"}, {"url": "https://git.kernel.org/stable/c/be87d86537de7ea6fd025f41033d2faff880973f"}, {"url": "https://git.kernel.org/stable/c/f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7"}, {"url": "https://git.kernel.org/stable/c/99109a51efd28c9a661fbfb9469b023c517b31d1"}], "title": "dmaengine: dw-edma: Terminate all descriptors without callbacks", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/dma/dw-edma/dw-edma-core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "da56839aced48ecb70033962d7ea98f55b0c5656", "status": "affected", "version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "versionType": "git"}, {"lessThan": "65e387b95d3855aa894ac729e1778e5bcb9083cb", "status": "affected", "version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "versionType": "git"}, {"lessThan": "4793f9099a1cadf4e37f3a03d524af6bce88a0ea", "status": "affected", "version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "versionType": "git"}, {"lessThan": "be87d86537de7ea6fd025f41033d2faff880973f", "status": "affected", "version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "versionType": "git"}, {"lessThan": "f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7", "status": "affected", "version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "versionType": "git"}, {"lessThan": "99109a51efd28c9a661fbfb9469b023c517b31d1", "status": "affected", "version": "e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/dma/dw-edma/dw-edma-core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.3"}, {"lessThan": "5.3", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "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."}], "id": "CVE-2026-93042", "lastModified": "2026-10-30T13:20:55.927", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-17T17:17:57.420", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4793f9099a1cadf4e37f3a03d524af6bce88a0ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/65e387b95d3855aa894ac729e1778e5bcb9083cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/99109a51efd28c9a661fbfb9469b023c517b31d1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/be87d86537de7ea6fd025f41033d2faff880973f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/da56839aced48ecb70033962d7ea98f55b0c5656"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf,65e387b95d3855aa894ac729e1778e5bcb9083cb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[65e387b95d3855aa894ac729e1778e5bcb9083cb,4793f9099a1cadf4e37f3a03d524af6bce88a0ea)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4793f9099a1cadf4e37f3a03d524af6bce88a0ea,be87d86537de7ea6fd025f41033d2faff880973f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be87d86537de7ea6fd025f41033d2faff880973f,f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7,99109a51efd28c9a661fbfb9469b023c517b31d1)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.3"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.3)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-19T07:00:11.419728+00:00", "updated": "2026-09-19T23:30:13.714969+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416"]}