CVE-2026-93054
HighCVSS 7.0Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, the uio driver has a stale info pointer issue in the failed registration path. After device_add(), the UIO device is visible to userspace and /dev/uioX can be opened. If a later setup step fails, __uio_register_device() unwinds the device but leaves idev->info pointing at the caller-owned struct uio_info. This is unsafe when an opener races with the failed registration path, leading to use-after-free. The fix handles post-device_add() failures like unregister: removes UIO attributes, clears idev->info under info_lock, and wakes waiters before removing the device.
Risk Assessment
Use-after-free can lead to system crashes or potential arbitrary code execution, posing a serious security risk.
Recommendation
It is recommended to update the Linux kernel to a version containing the fix that clears the info pointer before device removal.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: uio: Fix stale info pointer in failed registration path After device_add(), the UIO device is visible to userspace and /dev/uioX can be opened. If a later setup step fails, __uio_register_device() unwinds the device but leaves idev->info pointing at the caller-owned struct uio_info. That is unsafe when an opener races with the failed registration path. The open file keeps a reference to the uio_device, while the caller sees registration failure and may free its struct uio_info. Later file operations can then follow idev->info and dereference freed memory. Handle post-device_add() failures like unregister: remove UIO attributes while the info pointer is still valid, then clear idev->info under info_lock and wake existing waiters/async users before removing the device and minor. This makes already-open file descriptors observe the same "device gone" state as normal uio_unregister_device().
Vulnerability data from NVD (NIST) · CISA KEV · EPSS