CVE-2026-92523 RDMA/nldev: validate dynamic counter attribute length
A missing length validation in the Linux kernel RDMA nldev subsystem allows local attackers to cause a denial of service by sending malformed netlink attributes.
- 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-2026-92523?
CVE-2026-92523 is a denial of service vulnerability in Linux, published on 17 Sep 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:
RDMA/nldev: validate dynamic counter attribute length
RDMA_NLDEV_ATTR_STAT_HWCOUNTERS is a nested attribute whose children are consumed directly with nla_get_u32(). The top-level policy validates only the container, so it does not establish the fixed shape of each child.
Require every child payload to be exactly one u32 before reading it.
Which versions are affected by CVE-2026-92523?
How do I fix CVE-2026-92523?
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-2026-92523 being exploited?
There is no known exploitation of CVE-2026-92523 in the wild and no public exploit code.
Sources
Also known as AZL-102224, BELL-CVE-2026-92523, DEBIAN-CVE-2026-92523, GHSA-cm7q-3wq8-gx9w, UBUNTU-CVE-2026-92523.