High [CVE-2026-74574] fix fdev setup failure cleanup in idxd_cdev_open
This high-severity Red Hat Linux advisory covers CVE-2026-74574 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
Summary
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. A race condition during file-device setup failure cleanup in the idxd_cdev_open() function could lead to a deadlock, causing a denial of service.
Furthermore, incorrect cleanup paths could result in operations on a freed memory context, potentially allowing a local attacker to escalate privileges. Red Hat severity: Moderate — CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H).
Weakness: CWE-833. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- The vulnerability resides in the `idxd` kernel module. If the Intel Data Streaming Accelerator (DSA) functionality is not actively used or required, the `idxd` module can be prevented from loading to mitigate this issue. To blacklist the module: 1. Create a new file `/etc/modprobe.d/blacklist-idxd.conf` with the following content: ``` blacklist idxd ``` 2. Regenerate the initramfs to ensure the blacklist takes effect on boot: ```bash sudo dracut -f -v ``` or for systems using `mkinitrd`: ```bash sudo mkinitrd -f /boot/initramfs-$(uname -r).img $(uname -r) ``` 3. Reboot the system for the changes to take effect. This mitigation may impact functionality that relies on the Intel Data Streaming Accelerator. If `idxd` functionality is required, this mitigation is not applicable.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.