CVE-2026-80952
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, i3c_master_unregister_i3c_devs() clears i3cdev->dev->desc before calling device_unregister(). During unregister, i3c_device_uevent() and a racing modalias_show() can observe a NULL desc and fall back to an uninitialized stack struct, leaking kernel stack contents. A use-after-free may also occur from writing desc after the device is released.
Risk Assessment
Kernel stack leak can aid bypassing protections (KASLR), and the use-after-free can lead to crashes or privilege escalation. Affects systems with an I3C bus.
Recommendation
Update the Linux kernel to a version where desc remains valid until device_unregister() completes, with an extra get_device()/put_device(). Until patched, limit dynamic registration/unregistration of I3C devices.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: i3c: master: Fix info leak and UAF in device unregister path i3c_master_unregister_i3c_devs() clears i3cdev->dev->desc before calling device_unregister(). During device_unregister(), device_del() emits a KOBJ_REMOVE uevent and unbinds the driver while the device descriptor is still expected to be valid. As a result, i3c_device_uevent() and a racing modalias_show() can observe a NULL desc and fall back to an uninitialized stack struct i3c_device_info, leaking kernel stack contents in the generated modalias. Driver .remove() callbacks may also encounter an unexpected NULL desc during unbind. Keep desc valid until device_unregister() has completed. Since device_unregister() drops the device reference and may free the device, take an extra reference with get_device() before unregistering. Clear desc afterwards and release the extra reference with put_device(). This preserves the release-time invariant that desc must be NULL while avoiding both the information leak and a potential use-after-free from writing desc after the device has been released.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS