CVE-2026-43435 rust_binder: fix oneway spam detection
A flaw in the Linux kernel's Rust binder implementation allowed spamming transactions to bypass detection, potentially leading to resource exhaustion and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43435?
CVE-2026-43435 is a medium-severity denial of service vulnerability in Linux kernel, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
rust_binder: fix oneway spam detection
The spam detection logic in TreeRange was executed before the current request was inserted into the tree. So the new request was not being factored in the spam calculation. Fix this by moving the logic after the new range has been inserted.
Also, the detection logic for ArrayRange was missing altogether which meant large spamming transactions could get away without being detected. Fix this by implementing an equivalent low_oneway_space() in ArrayRange.
Note that I looked into centralizing this logic in RangeAllocator but iterating through 'state' and 'size' got a bit too complicated (for me) and I abandoned this effort.
Which versions are affected by CVE-2026-43435?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43435?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-43435 being exploited?
There is no known exploitation of CVE-2026-43435 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43435, DEBIAN-CVE-2026-43435, GHSA-267q-r86j-cvg7, UBUNTU-CVE-2026-43435.