{"api_version":"1","generated_at":"2026-08-17T11:24:48+00:00","cve":"CVE-2026-74574","urls":{"html":"https://cve.report/CVE-2026-74574","api":"https://cve.report/api/cve/CVE-2026-74574.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74574","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74574"},"summary":{"title":"dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()\n\nThe failed_dev_add and failed_dev_name paths drop the file-device\nreference while wq->wq_lock is still held. If put_device(fdev) drops the\nlast reference, idxd_file_dev_release() runs synchronously and tries to\ntake wq->wq_lock again, deadlocking.\n\nThose paths also fall through into the later ctx cleanup labels even\nthough idxd_file_dev_release() owns that cleanup and frees ctx. This can\nmake idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context.\n\nMove idxd_wq_get() before file-device setup can fail, since the release\ncallback always calls idxd_wq_put(). Then unlock wq->wq_lock before\nput_device(fdev) and return directly from the file-device setup failure\npath, leaving ctx cleanup to the release callback.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:18:03","updated_at":"2026-08-17 06:19:55"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e","name":"https://git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7","name":"https://git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066","name":"https://git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55","name":"https://git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7","name":"https://git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74574","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74574","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec 778ccbded2c8749c5be7f0dfa04fc9977a36fb7e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec 8d5d28285728be47c82fdf1c48be4268293c90e7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec 0679c0c189d2548f00e1bac95be28e2df5c6c7f7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec 6e26a41c4c1a706edaaa7c7dffc6b3b945707a55 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74574","cve":"CVE-2026-74574","epss":"0.001600000","percentile":"0.056500000","score_date":"2026-08-16","updated_at":"2026-08-17 00:01:04"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/dma/idxd/cdev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"778ccbded2c8749c5be7f0dfa04fc9977a36fb7e","status":"affected","version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","versionType":"git"},{"lessThan":"8d5d28285728be47c82fdf1c48be4268293c90e7","status":"affected","version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","versionType":"git"},{"lessThan":"0679c0c189d2548f00e1bac95be28e2df5c6c7f7","status":"affected","version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","versionType":"git"},{"lessThan":"6e26a41c4c1a706edaaa7c7dffc6b3b945707a55","status":"affected","version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","versionType":"git"},{"lessThan":"ee1d7274102285d78a53161fc705a8d8cd40b066","status":"affected","version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/dma/idxd/cdev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.4"},{"lessThan":"6.4","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.151","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.103","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.151","versionStartIncluding":"6.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"6.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"6.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"6.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()\n\nThe failed_dev_add and failed_dev_name paths drop the file-device\nreference while wq->wq_lock is still held. If put_device(fdev) drops the\nlast reference, idxd_file_dev_release() runs synchronously and tries to\ntake wq->wq_lock again, deadlocking.\n\nThose paths also fall through into the later ctx cleanup labels even\nthough idxd_file_dev_release() owns that cleanup and frees ctx. This can\nmake idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context.\n\nMove idxd_wq_get() before file-device setup can fail, since the release\ncallback always calls idxd_wq_put(). Then unlock wq->wq_lock before\nput_device(fdev) and return directly from the file-device setup failure\npath, leaving ctx cleanup to the release callback."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is reached only through the local open() syscall on an Intel DSA/IDXD user workqueue character device (/dev/dsa/wq* or /dev/iax/wq*); idxd_cdev_open() is the cdev .open handler and is not reachable from any network-facing kernel service.\nAC:L - An attacker who can open the cdev can reliably hit the failed_dev_name/failed_dev_add cleanup by inducing GFP_KERNEL allocation failures (e.g., memory pressure) during device setup; no race or victim-controlled state beyond that is required.\nPR:L - Exploitation requires only local permission to open the configured user-type DSA workqueue cdev, which on DSA-equipped servers is commonly granted to unprivileged workload/service accounts via udev group ACLs after one-time admin WQ setup, not init-namespace root.\nUI:N - The attacker triggers the bug by opening the character device themselves; no additional end-user or administrator interaction is required at exploitation time beyond prior WQ enablement.\nS:U - The deadlock, use-after-free, and double-free corrupt kernel/IDXD driver heap state and block the affected workqueue; impact does not cross VM, IOMMU/DMA, or other security boundaries into a separate authority.\nC:H - On the error path put_device() synchronously runs idxd_file_dev_release(), which kfree()s ctx while idxd_cdev_open() still references it via filp->private_data, and the fall-through path can call idxd_xa_pasid_remove()/kfree() again—classic kernel heap UAF enabling memory disclosure.\nI:H - Double-free and use-after-free of the kmalloc-backed idxd_user_context can corrupt slab metadata and be developed into arbitrary kernel memory writes and privilege escalation, not merely a controlled error return.\nA:H - Calling put_device() while holding wq->wq_lock deadlocks when idxd_file_dev_release() re-acquires that mutex, hanging the opener and blocking all other users of the workqueue; heap corruption can additionally panic the kernel."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:48:53.873Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e"},{"url":"https://git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7"},{"url":"https://git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7"},{"url":"https://git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55"},{"url":"https://git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066"}],"title":"dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74574","datePublished":"2026-08-15T12:28:12.558Z","dateReserved":"2026-08-15T05:44:03.917Z","dateUpdated":"2026-08-17T05:48:53.873Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:18:03","lastModifiedDate":"2026-08-17 06:19:55","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74574","Ordinal":"1","Title":"dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_ope","CVE":"CVE-2026-74574","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74574","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()\n\nThe failed_dev_add and failed_dev_name paths drop the file-device\nreference while wq->wq_lock is still held. If put_device(fdev) drops the\nlast reference, idxd_file_dev_release() runs synchronously and tries to\ntake wq->wq_lock again, deadlocking.\n\nThose paths also fall through into the later ctx cleanup labels even\nthough idxd_file_dev_release() owns that cleanup and frees ctx. This can\nmake idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context.\n\nMove idxd_wq_get() before file-device setup can fail, since the release\ncallback always calls idxd_wq_put(). Then unlock wq->wq_lock before\nput_device(fdev) and return directly from the file-device setup failure\npath, leaving ctx cleanup to the release callback.","Type":"Description","Title":"dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_ope"}]}}}