CVE-2026-80952: Linux Vulnerability (CVSS 7.8)

Description

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.13%

2.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0, < 334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e; >= 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0, < 109995153898454c7795c2c299fd0a0b57456a4b; >= 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0, < c64daaaba08e490c8347ff60aacac4dd51249f91; >= 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0, < ef72ff6650c4ebf2b444708d84df66db42f262d9; >= 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0, < c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49; >= 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0, < 94fb9786d67a8f8b899e77381620f86bad94fdf7; >= 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0, < 4837be0f9ac2efe5e83b35a696b6242c473d280c; >= 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0, < d2c743efd2d1ee64e94324664808f623dd865872
Linux	Linux	5.0

References

Timeline

Published: Sep 11, 2026
Last Modified: Sep 14, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-80952?

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.

How severe is CVE-2026-80952?

CVE-2026-80952 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.

How do I fix CVE-2026-80952?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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