CVE-2026-99075 rust_binder: reschedule node refcount update on thread exit
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99075?
CVE-2026-99075 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
rust_binder: reschedule node refcount update on thread exit
When a thread exits via BINDER_THREAD_EXIT, its pending work items are cancelled. If a thread exits while holding a pending node refcount increment (e.g. pushed as deferred work to that thread), the refcount increment was previously dropped because Node::cancel() and NodeWrapper::cancel() were no-ops.
Dropping the refcount update leaves the node's delivery state and count state desynchronized, and userspace will not receive the notification, which can cause the node to never be freed from the process's nodes tree when all external references are dropped.
Fix this by implementing DeliverToRead::cancel() for Node and NodeWrapper to move the pending refcount update to the process's work queue on thread exit so another thread can deliver it to userspace.
Which versions are affected by CVE-2026-99075?
How do I fix CVE-2026-99075?
Upgrade to a fixed version.
Is CVE-2026-99075 being exploited?
There is no known exploitation of CVE-2026-99075 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-99075, DEBIAN-CVE-2026-99075, GHSA-gxfj-h7rr-9wq9, UBUNTU-CVE-2026-99075.