Out-of-bounds write in Linux kernel - CVE-2026-89725
Published: September 12, 2026
Vulnerability identifier: #VU149080
CSH Severity: High
CVSS v4: 7.2 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89725
CWE-ID: CWE-787
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to write peer-controlled bytes out of bounds into surrounding memory.
The vulnerability exists due to an out-of-bounds write in stm32_rx_done() in the STM32 CEC driver when processing an overlong CEC message from a peer. A remote attacker can send a CEC message without ending it to write peer-controlled bytes out of bounds into surrounding memory.
The driver must be probed and receiving must be enabled.
Affected software
Linux kernel
How to mitigate CVE-2026-89725
Install security update from vendor's repository.