Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 before 334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e; affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 before 109995153898454c7795c2c299fd0a0b57456a4b; affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 before c64daaaba08e490c8347ff60aacac4dd51249f91; affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 before ef72ff6650c4ebf2b444708d84df66db42f262d9; affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 before c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49; affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 before 94fb9786d67a8f8b899e77381620f86bad94fdf7; affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 before 4837be0f9ac2efe5e83b35a696b6242c473d280c; affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 before d2c743efd2d1ee64e94324664808f623dd865872 |
| Linux / Linux | affected 5.0; unaffected 0 before 5.0; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/334cfb5e285cece5dc49fb3fb8ea9b70b2cb5d7e
- https://git.kernel.org/stable/c/109995153898454c7795c2c299fd0a0b57456a4b
- https://git.kernel.org/stable/c/c64daaaba08e490c8347ff60aacac4dd51249f91
- https://git.kernel.org/stable/c/ef72ff6650c4ebf2b444708d84df66db42f262d9
- https://git.kernel.org/stable/c/c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49
- https://git.kernel.org/stable/c/94fb9786d67a8f8b899e77381620f86bad94fdf7
- https://git.kernel.org/stable/c/4837be0f9ac2efe5e83b35a696b6242c473d280c
- https://git.kernel.org/stable/c/d2c743efd2d1ee64e94324664808f623dd865872