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How the CVE Works:
CVE-2025-22085 is a use-after-free vulnerability in the Linux kernel’s RDMA (Remote Direct Memory Access) subsystem. The issue occurs when renaming an RDMA device, where improper handling of device names leads to memory corruption. When `ib_device_notify_register()` is called during device registration, it triggers a notification via rdma_nl_notify_event(). The vulnerability manifests when the kernel attempts to access freed memory through `nla_put()` operations during Netlink attribute handling. Attackers could exploit this to execute arbitrary code or cause denial-of-service conditions by carefully timing device rename operations while notifications are being processed.
DailyCVE Form:
Platform: Linux Kernel
Version: Pre-6.14.0-rc4
Vulnerability: Use-After-Free
Severity: Critical
date: 04/16/2025
What Undercode Say:
Exploitation Analysis:
1. The vulnerability requires RDMA subsystem access
2. Attackers can trigger via device rename operations
3. Memory corruption occurs during Netlink notification handling
Protection Commands:
Check kernel version uname -r Verify RDMA modules lsmod | grep rdma Temporary mitigation echo 1 > /proc/sys/kernel/modules_disabled
Patch Verification:
Check for backported fixes git grep "ib_device_notify_register" /usr/src/linux/ Verify kernel config grep CONFIG_INFINIBAND /boot/config-$(uname -r)
Detection Script:
include <stdio.h>
include <infiniband/verbs.h>
int main() {
struct ibv_device dev_list = ibv_get_device_list(NULL);
if (!dev_list) {
printf("RDMA not available\n");
return 1;
}
printf("Vulnerable RDMA stack detected\n");
return 0;
}
Kernel Config Hardening:
Disable vulnerable subsystems if unused CONFIG_INFINIBAND=n CONFIG_INFINIBAND_USER_ACCESS=n CONFIG_RDMA=n
SystemD Protection:
[bash] Description=Disable RDMA [bash] Type=oneshot ExecStart=/bin/sh -c "echo 'blacklist ib_core' > /etc/modprobe.d/disable-rdma.conf" ExecStart=/bin/sh -c "echo 'blacklist rdma_cm' >> /etc/modprobe.d/disable-rdma.conf" [bash] WantedBy=multi-user.target
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
