Memory corruption in Linux kernel - CVE-2026-89728
Published: September 12, 2026
Vulnerability identifier: #VU149071
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89728
CWE-ID: CWE-119
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89728
Install security update from vendor's repository.