SB2026091316 - Use-after-free in Linux kernel i3c driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-80952)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to disclose kernel stack contents and cause a use-after-free.

The vulnerability exists due to improper device descriptor lifetime management in i3c_master_unregister_i3c_devs() when unregistering I3C devices. A local user can trigger device unregistration while a modalias is generated to disclose kernel stack contents and cause a use-after-free.

A racing modalias operation can observe a NULL device descriptor and use an uninitialized stack i3c_device_info structure.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4837be0f9ac2efe5e83b35a696b6242c473d280c
• https://git.kernel.org/stable/c/94fb9786d67a8f8b899e77381620f86bad94fdf7
• https://git.kernel.org/stable/c/c16b6f25e0cc2dd1055dde1256cbf5a9e888cf49
• https://git.kernel.org/stable/c/d2c743efd2d1ee64e94324664808f623dd865872