CVE-2026-92509 RDMA/core: Fix potential use after free in counter_release()
A use-after-free in the Linux kernel RDMA core allows local attackers to potentially execute code or escalate privileges via netlink counter access.
- 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-2026-92509?
CVE-2026-92509 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: Fix potential use after free in counter_release()
When accessing a counter via the netlink path the only synchronization mechanism for the said counter is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of counter_release(), which is too late, since by that point vendor-specific resources associated with the counter might already be freed. This can leave a short window where the counter remains accessible through restrack, leading to a potential use-after-free.
Fix this by moving the rdma_restrack_del() call to be before the freeing of the vendor-specific resources, ensuring that the counter is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a counter that is in the process of destruction.
Which versions are affected by CVE-2026-92509?
How do I fix CVE-2026-92509?
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-2026-92509 being exploited?
There is no known exploitation of CVE-2026-92509 in the wild and no public exploit code.
Sources
Also known as AZL-102183, BELL-CVE-2026-92509, DEBIAN-CVE-2026-92509, GHSA-w9c6-3cwc-m3q4, UBUNTU-CVE-2026-92509.