CVE-2026-89531 svcrdma: Reject connection when transport allocation fails
A remote attacker can cause a denial of service by triggering memory allocation failures in the Linux kernel's svcrdma module, leading to resource leaks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89531?
CVE-2026-89531 is a denial of service vulnerability in Linux, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
svcrdma: Reject connection when transport allocation fails
handle_connect_req() returns without action when svc_rdma_create_xprt() fails to allocate the new transport. The CM core returns 0 for CONNECT_REQUEST events, so it does not destroy the new rdma_cm_id. Each allocation failure under memory pressure leaks one rdma_cm_id, and a remote peer driving connection attempts can amplify this.
Reject the connection by returning a non-zero status from the CM event handler, which tells the CM core to destroy the orphaned cm_id.
Which versions are affected by CVE-2026-89531?
How do I fix CVE-2026-89531?
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-2026-89531 being exploited?
There is no known exploitation of CVE-2026-89531 in the wild and no public exploit code.
Sources
Also known as AZL-100640, BELL-CVE-2026-89531, DEBIAN-CVE-2026-89531, GHSA-vgrv-wfr9-vqh2, UBUNTU-CVE-2026-89531.