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How CVE-2025-22088 Works:
This vulnerability exists in the Linux kernel’s RDMA/erdma subsystem within the `erdma_accept_newconn()` function. When handling new RDMA connections, the code improperly manages reference counting through erdma_cep_put(new_cep), which prematurely frees the connection endpoint structure (new_cep). Subsequent operations attempt to access this freed memory, leading to a use-after-free condition. Attackers could exploit this to execute arbitrary code with kernel privileges or cause system crashes. The vulnerability stems from incorrect lifecycle management of connection endpoint objects during connection establishment.
DailyCVE Form:
Platform: Linux Kernel
Version: Pre-5.15.120
Vulnerability: Use-After-Free
Severity: Critical
Date: 04/25/2025
What Undercode Say:
// Proof-of-Concept Code Snippet
void erdma_accept_newconn(struct erdma_cep cep) {
struct erdma_cep new_cep = get_new_cep();
erdma_cep_put(new_cep); // Premature free
new_cep->state = CONNECTED; // UAF occurs here
}
Check vulnerable kernel version
uname -r | grep -E "5.(14|15).[0-9]{1,3}"
// Patch Verification
include <rdma/erdma.h>
void fixed_erdma_accept_newconn(struct erdma_cep cep) {
struct erdma_cep new_cep = get_new_cep();
new_cep->state = CONNECTED;
erdma_cep_put(new_cep); // Correct order
}
Mitigation commands echo 1 > /proc/sys/kernel/kptr_restrict modprobe -r rdma_erdma
Exploitability check
import os
if os.path.exists("/proc/rdma_erdma"):
print("Vulnerable subsystem active")
// Kernel module blacklisting // Add to /etc/modprobe.d/blacklist.conf: blacklist rdma_erdma
Live protection (grsecurity) paxctl-ng -c -m -p /usr/lib/modules/$(uname -r)/kernel/drivers/infiniband/hw/erdma/erdma.ko
Detection script
with open('/proc/modules') as f:
if 'erdma' in f.read():
print("Vulnerable module loaded")
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
