{"id":"CVE-2026-74574","state":"PUBLISHED","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.","publishedAt":"2026-08-15T12:28:12.558Z","updatedAt":"2026-10-16T19:05:57.115Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","status":"affected","lessThan":"778ccbded2c8749c5be7f0dfa04fc9977a36fb7e","versionType":"git"},{"version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","status":"affected","lessThan":"8d5d28285728be47c82fdf1c48be4268293c90e7","versionType":"git"},{"version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","status":"affected","lessThan":"0679c0c189d2548f00e1bac95be28e2df5c6c7f7","versionType":"git"},{"version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","status":"affected","lessThan":"6e26a41c4c1a706edaaa7c7dffc6b3b945707a55","versionType":"git"},{"version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","status":"affected","lessThan":"ee1d7274102285d78a53161fc705a8d8cd40b066","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/idxd/cdev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/idxd/cdev.c"]}],"references":["https://git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e","https://git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7","https://git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7","https://git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55","https://git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74574.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74574","state":"PUBLISHED","datePublished":"2026-08-15T12:28:12.558Z","dateUpdated":"2026-10-16T19:05:57.115Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.917Z"},"containers":{"cna":{"title":"dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","status":"affected","lessThan":"778ccbded2c8749c5be7f0dfa04fc9977a36fb7e","versionType":"git"},{"version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","status":"affected","lessThan":"8d5d28285728be47c82fdf1c48be4268293c90e7","versionType":"git"},{"version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","status":"affected","lessThan":"0679c0c189d2548f00e1bac95be28e2df5c6c7f7","versionType":"git"},{"version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","status":"affected","lessThan":"6e26a41c4c1a706edaaa7c7dffc6b3b945707a55","versionType":"git"},{"version":"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec","status":"affected","lessThan":"ee1d7274102285d78a53161fc705a8d8cd40b066","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/idxd/cdev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/idxd/cdev.c"]}],"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"}],"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 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":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:48:53.873Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-74574","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T19:00:43.194808Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:05:57.115Z"}}]}}}