The Linux kernel rust_binder vulnerability (CVE-2026-64467) involves improper handling of the offsets array during Allocation's Drop cleanup. The code used usize instead of u64 for stride and per-entry reads, causing 32-bit kernels to iterate the array incorrectly and over-decrement reference counts. This reference count corruption can lead to erroneous notifications of reference releases and refcount underflow errors, particularly on 32-bit ARM where the driver guards against underflow and triggers a failure. The fix changes the stride to u64 and reads each entry as u64, converting safely to usize.

On 32-bit Linux kernels, this vulnerability corrupts binder's reference counting by over-decrementing reference counts, which can cause incorrect release notifications and refcount underflow errors. This undermines the integrity of binder's reference management, potentially affecting kernel stability or causing unexpected behavior in binder-related operations. On 64-bit kernels, the issue is harmless. There are no known exploits in the wild.

A fix has been implemented in the Linux kernel to correct the stride and read size to u64 with safe conversion, resolving the reference count corruption issue. Users should apply the official kernel update containing this fix. Since this is a kernel-level vulnerability, upgrading to the patched kernel version is the recommended remediation. Patch status is not explicitly confirmed in the provided data; check the vendor advisory or Linux kernel mailing lists for the exact fixed version and update accordingly.