SB2026091257 - Out-of-bounds write in Linux kernel platform stm32 driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-89725)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0c260d3f97e52978a8c769bb095ac0901333a3ac
• https://git.kernel.org/stable/c/a85ce3b175615c2e13bc01e8a1b6b6b6910fde57
• https://git.kernel.org/stable/c/c3edd7fb8e3692423a702705509947fc9c30b3d1
• https://git.kernel.org/stable/c/fb9dda38d4b9e90db07ed9a0ee2d35bf85494035