CVE-2026-45852

A flaw was found in the Linux kernel's Remote Direct Memory Access (RDMA) subsystem, specifically within the rxe driver. An error in the rxe_srq_from_init function's memory management can lead to a double free vulnerability. This occurs when an attempt to copy data to user space fails, causing the same memory region to be freed twice. A local attacker could potentially exploit this flaw to cause a denial of service (DoS) by crashing the system.

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 vulnerability, prevent the rdma_rxe kernel module from loading. Create a file /etc/modprobe.d/blacklist-rdma_rxe.conf with blacklist rdma_rxe. Regenerate the initramfs using sudo dracut -f -v (or sudo mkinitrd -f -v /boot/initramfs-$(uname -r).img $(uname -r) for older systems) and reboot. This action may impact functionality dependent on the RDMA/rxe driver.