CVE-2026-64467
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel rust_binder driver, an incorrect stride (usize instead of u64) is used when cleaning up the offsets array. On 32-bit kernels, this causes over-decrement of reference counts and corrupted reference accounting.
Risk Assessment
The vulnerability can lead to incorrect reference management in binder, potentially causing system crashes or unexpected behavior.
Recommendation
Apply the Linux kernel patch that changes the stride to u64 and reads each entry as u64.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: rust_binder: use a u64 stride when cleaning up the offsets array Allocation's Drop walks the offsets array (binder_size_t = u64 entries), cleaning up the objects, but it used usize instead of u64 for both the stride and the per-entry read. On 64-bit kernels (usize == u64) this is harmless, but on 32-bit kernels it walks the 8-byte entries in 4-byte steps, iterating an N-entry array 2N times, and reads the always-zero high word as offset 0, cleaning up the object at offset 0 N extra times. As a result the referenced node or handle ends up with a lower reference count than it actually has (a refcount over-decrement), and binder's reference accounting is corrupted; for example, the owner can be notified of a strong reference release (BR_RELEASE) even though references still remain. Change the stride to u64, and read each entry as a u64, narrowing it to usize with try_into(). On 32-bit ARM, when this over-decrement would drive a count below zero, the driver's existing refcount guard refuses it and fires: rust_binder: Failure: refcount underflow!