SB2026091248 - Memory corruption in Linux kernel i3c master driver

Description

This security bulletin contains information about 1 vulnerability.

1) Memory corruption (CVE-ID: CVE-2026-89728)

CWE-ID: CWE-119 - Memory corruption

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to trigger an out-of-bounds access.

The vulnerability exists due to improper bounds checking in Renesas I3C controller DAA handling when initiating dynamic address assignment on an empty I3C bus. A local user can initiate dynamic address assignment to trigger an out-of-bounds access.

When the bus is empty, the controller reports its maximum supported device count through the response descriptor data-length field.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/50dec95c9d1f1f82819bc898ef2b60fa83fd4ccd
• https://git.kernel.org/stable/c/769f5a233efcf8587f70fb2244a202d88582c746