In the Linux kernel, the following vulnerability has been resolved:
rxrpc: Fix leak of rxgk context in rxgk_verify_response()
Fix rxgk_verify_response() to clean up the rxgk context it creates.
Linux Kernel (Affected versions prior to fixes in commits 1bd3d01, 4b5e83, 7e1876c)
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
/*
* PoC for CVE-2026-31632 (Linux Kernel rxgk Memory Leak)
* This code attempts to trigger the memory leak in rxgk_verify_response().
* Note: This is a conceptual demonstration. Triggering the specific kernel path
* requires a configured rxrpc environment and specific key handling.
* Compilation: gcc -o poc_cve2026_31632 poc_cve2026_31632.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
// Simulating the trigger mechanism
void trigger_vulnerability() {
int sock;
// In a real scenario, this would involve creating an AF_RXRPC socket
// and manipulating rxgk keys to hit the rxgk_verify_response path.
// sock = socket(AF_RXRPC, SOCK_SEQPACKET, AF_KAFS);
// ... setup rxgk security context and send packets ...
// Loop to simulate repeated calls to expose the leak
for (int i = 0; i < 100; i++) {
// System call or socket operation triggering the vulnerable function
// This placeholder represents the interaction causing the leak
usleep(10000);
}
}
int main() {
printf("[*] Starting PoC for CVE-2026-31632\n");
printf("[*] Attempting to leak kernel memory via rxgk_verify_response()...\n");
while (1) {
trigger_vulnerability();
printf("[+] Iteration complete. Check kernel memory usage (e.g., slabtop / cat /proc/meminfo).\n");
sleep(1);
}
return 0;
}