CVE-2026-89510 RDMA/cxgb4: Cancel reg_work before freeing device on remove
A use-after-free vulnerability in the Linux kernel's cxgb4 RDMA driver allows attackers to cause denial of service or execute code during device removal.
- 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-2026-89510?
CVE-2026-89510 is a high-severity use after free vulnerability in Linux, published on 11 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: Cancel reg_work before freeing device on remove
c4iw_uld_state_change() queues reg_work to register the RDMA device. c4iw_remove() can free ctx->dev while this work is pending or running, leaving c4iw_register_device() accessing the freed device.
Cancel reg_work before removing the device. The registration work can tear down ctx->dev when registration fails, so do not unregister or deallocate it again in that case.
This issue was found by an in-house static analysis tool.
Which versions are affected by CVE-2026-89510?
How do I fix CVE-2026-89510?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-89510 being exploited?
There is no known exploitation of CVE-2026-89510 in the wild and no public exploit code.
Sources
Also known as AZL-100115, BELL-CVE-2026-89510, DEBIAN-CVE-2026-89510, GHSA-82cq-j2q5-4p5v, UBUNTU-CVE-2026-89510.