SB2026050898 - Improper access control in Linux kernel android binder driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper access control (CVE-ID: CVE-2026-43434)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to modify normally read-only binder pages.

The vulnerability exists due to improper access control in Rust Binder VMA handling when looking up a VMA by address and installing or zapping pages. A local user can remap memory so that Rust Binder interacts with the wrong VMA to modify normally read-only binder pages.

The issue occurs if the original VMA is closed and replaced with a different VMA at the same address.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/20a01f20d1f4064d90a8627aa41b5987f0220bb9
• https://git.kernel.org/stable/c/5a472d04fb4b9115fb7d1535bd885cea450f14db
• https://git.kernel.org/stable/c/8ef2c15aeae07647f530d30f6daaf79eb801bcd1