CVE-2026-93110 RDMA/core: Wait for RCU callbacks before unloading ib_core
A use-after-free vulnerability in the Linux kernel RDMA core allows local attackers with high privileges to execute arbitrary code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93110?
CVE-2026-93110 is an use after free 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/core: Wait for RCU callbacks before unloading ib_core
put_gid_ndev() is queued with call_rcu() and implemented in ib_core. Stopping the workqueues does not drain callbacks already queued, so RCU could invoke it after the module code has been unloaded.
synchronize_rcu() does not wait for callbacks. Wait for them after all producers have stopped.
Which versions are affected by CVE-2026-93110?
How do I fix CVE-2026-93110?
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-2026-93110 being exploited?
There is no known exploitation of CVE-2026-93110 in the wild and no public exploit code.
Sources
Also known as AZL-102350, BELL-CVE-2026-93110, DEBIAN-CVE-2026-93110, GHSA-7xfw-24xh-pg25, UBUNTU-CVE-2026-93110.