CVE-2026-90219 RDMA/cxgb4: Free debugfs on registration failure
A memory leak in the Linux kernel RDMA driver can lead to resource exhaustion and denial of service when device registration fails.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90219?
CVE-2026-90219 is a memory corruption 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/cxgb4: Free debugfs on registration failure
c4iw_alloc() creates the per-device debugfs tree (dev->debugfs_root via setup_debugfs()), but it is removed only in c4iw_remove(), not in c4iw_dealloc(). When RDMA device registration fails, the registration worker's err_dealloc_ctx path calls c4iw_dealloc() directly, bypassing c4iw_remove(), so the debugfs dentries leak and outlive the freed c4iw_dev.
Move debugfs_remove_recursive() into c4iw_dealloc() so every path that frees ctx->dev also removes its debugfs tree.
Which versions are affected by CVE-2026-90219?
How do I fix CVE-2026-90219?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-90219 being exploited?
There is no known exploitation of CVE-2026-90219 in the wild and no public exploit code.
Sources
Also known as AZL-102623, BELL-CVE-2026-90219, DEBIAN-CVE-2026-90219, GHSA-q35c-r5m8-jm6q, UBUNTU-CVE-2026-90219.