CVE-2026-43317 most: core: fix leak on early registration failure
A resource leak in the Linux kernel MOST core driver allows attackers to cause a denial of service by triggering early registration failures.
- 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-2026-43317?
CVE-2026-43317 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:
most: core: fix leak on early registration failure
A recent commit fixed a resource leak on early registration failures but for some reason left out the first error path which still leaks the resources associated with the interface.
Fix up also the first error path so that the interface is always released on errors.
Weakness: CWE-401
Which versions are affected by CVE-2026-43317?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43317?
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-2026-43317 being exploited?
There is no known exploitation of CVE-2026-43317 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43317, DEBIAN-CVE-2026-43317, GHSA-94jm-9m2w-wfhh, ROOT-OS-DEBIAN-11-CVE-2026-43317, ROOT-OS-DEBIAN-12-CVE-2026-43317, ROOT-OS-UBUNTU-2204-CVE-2026-43317 and 2 more.