High [CVE-2026-64473] Remove device debugfs before releasing devres
This high-severity Red Hat Linux advisory covers CVE-2026-64473 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
In the Linux kernel, the following vulnerability has been resolved: vfio: Remove device debugfs before releasing devres VFIO device debugfs files created with debugfs_create_devm_seqfile() store a devres allocated debugfs_devm_entry as inode private data. vfio_unregister_group_dev() currently calls vfio_device_del() before vfio_device_debugfs_exit(), but device_del() releases devres.
This can leave debugfs entries visible with stale inode private data while unregister waits for userspace references to drain. The debugfs view is diagnostic only, so losing it at the start of unregister is preferable to preserving entries whose backing storage may already have been released.
Complete the teardown by clearing the per-device debugfs root after removal. This matches the global debugfs root cleanup and prevents future users from mistaking a removed dentry for a live debugfs tree during the remainder of unregister.
A flaw was found in the VFIO (Virtual Function I/O) subsystem of the Linux kernel. During device unregistration, debugfs (a diagnostic filesystem) entries might remain visible with outdated or "stale" data after the associated resources have been released.
This occurs because the debugfs entries are not removed before the device resources are deallocated. While primarily affecting diagnostic views, this could lead to an attacker observing incorrect system state.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 26 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 · medium-confidence parse· fetched 26 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 26 days ago·verify at source
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