dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74574
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:18:03 UTC
Updated2026-08-17 06:19:55 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open() The failed_dev_add and failed_dev_name paths drop the file-device reference while wq->wq_lock is still held. If put_device(fdev) drops the last reference, idxd_file_dev_release() runs synchronously and tries to take wq->wq_lock again, deadlocking. Those paths also fall through into the later ctx cleanup labels even though idxd_file_dev_release() owns that cleanup and frees ctx. This can make idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context. Move idxd_wq_get() before file-device setup can fail, since the release callback always calls idxd_wq_put(). Then unlock wq->wq_lock before put_device(fdev) and return directly from the file-device setup failure path, leaving ctx cleanup to the release callback.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001600000 probability, percentile 0.056500000 (date 2026-08-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec 778ccbded2c8749c5be7f0dfa04fc9977a36fb7e git Not specified
CNA Linux Linux affected e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec 8d5d28285728be47c82fdf1c48be4268293c90e7 git Not specified
CNA Linux Linux affected e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec 0679c0c189d2548f00e1bac95be28e2df5c6c7f7 git Not specified
CNA Linux Linux affected e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec 6e26a41c4c1a706edaaa7c7dffc6b3b945707a55 git Not specified
CNA Linux Linux affected e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec ee1d7274102285d78a53161fc705a8d8cd40b066 git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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