SB2026091259 - Out-of-bounds read in Linux kernel phy rockchip driver

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-89721)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in the max_register configuration of the Rockchip Samsung DCPHY PHY driver when dumping registers through the regmap debugfs interface. A local user can dump registers through the regmap debugfs interface to cause a denial of service.

The resulting oops occurs while the regmap lock is held, causing subsequent PHY operations to deadlock.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/14afe18655c0951f4f85898f761bf92264e65ccd
• https://git.kernel.org/stable/c/4486e75ba647bd8b98fc1f053101b40caceeed4b
• https://git.kernel.org/stable/c/c1a62f9dcf531d56c56da2e4435386b6d264c69f