CVE-2026-74574

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

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 ↗