CVE-2026-74574 - dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()

CVE-2026-74574 - dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()

https://cvefeed.io/rssfeed/latest.atom / Sat, 08/15/2026 - 19:26
CVE ID :CVE-2026-74574
Published : Aug. 15, 2026, 1:18 p.m. | 2 hours, 11 minutes ago
Description :In 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.
Severity: 0.0 | NA
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