CVE-2026-80864

A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) subsystem, specifically within the rxe component. A local, unprivileged user could exploit a race condition during a queue pair modification operation. This could lead to a use-after-free vulnerability, allowing the attacker to cause a system crash and resulting in a Denial of Service (DoS).

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the rdma_rxe kernel module from being loaded.

1. Create a configuration file in /etc/modprobe.d to disable loading of the module:

echo "install rdma_rxe /bin/true" > /etc/modprobe.d/disable-rdma_rxe.conf

2. If the module is currently loaded, attempt to unload it:

modprobe -r rdma_rxe

Caveats: Disabling this module prevents the creation and operation of software RDMA over Converged Ethernet (Soft-RoCE) devices. Applications requiring rdma_rxe will fail to initialize. If the module is currently in active use and cannot be unloaded dynamically, a system reboot is required to ensure the module is fully disabled.