CVE-2026-31565

A flaw was found in the Linux kernel's RDMA/irdma component. A local user can trigger a deadlock by performing a network device (netdev) reset while Remote Direct Memory Access (RDMA) applications are actively running, particularly in iWARP mode. This action creates a circular dependency during the removal of RDMA clients, causing an indefinite wait. This vulnerability can lead to a Denial of Service (DoS) condition, making the system unresponsive.

A Moderate severity flaw was identified in the Linux kernel's RDMA/irdma component. This issue allows a local attacker to induce a denial of service by initiating a network device reset while RDMA applications are actively utilizing iWARP mode. This specific interaction can lead to a kernel deadlock, rendering the system unresponsive.

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, if RDMA functionality is not required, the irdma kernel module can be blacklisted to prevent it from loading. This will disable RDMA capabilities provided by the irdma driver.

1. Create a file named /etc/modprobe.d/blacklist-irdma.conf with the following content:

   blacklist irdma
   

2. Regenerate the initramfs to ensure the blacklist takes effect on boot. For Red Hat Enterprise Linux 8 and 9, use dracut -f -v. For Red Hat Enterprise Linux 7, use dracut -f.
3. A system reboot is required for these changes to take full effect.