CVE-2026-43300

Description

In the Linux kernel, the following vulnerability has been resolved: drm/panel: Fix a possible null-pointer dereference in jdi_panel_dsi_remove() In jdi_panel_dsi_remove(), jdi is explicitly checked, indicating that it may be NULL: if (!jdi) mipi_dsi_detach(dsi); However, when jdi is NULL, the function does not return and continues by calling jdi_panel_disable(): err = jdi_panel_disable(&jdi->base); Inside jdi_panel_disable(), jdi is dereferenced unconditionally, which can lead to a NULL-pointer dereference: struct jdi_panel *jdi = to_panel_jdi(panel); backlight_disable(jdi->backlight); To prevent such a potential NULL-pointer dereference, return early from jdi_panel_dsi_remove() when jdi is NULL.

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 (versions before specific stable commits)

PoC / Exploit Code

⚠ For Security Research Only

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

python

// Simulated PoC for CVE-2026-43300
// This demonstrates the logic flaw in jdi_panel_dsi_remove()

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

struct jdi_panel {
    int base;
    void *backlight;
};

void jdi_panel_disable(struct jdi_panel *jdi) {
    // This line causes the crash if jdi is NULL
    printf("Disabling backlight at %p\n", jdi->backlight); 
}

void jdi_panel_dsi_remove(struct jdi_panel *jdi) {
    if (!jdi) {
        printf("jdi is NULL, detaching DSI...\n");
        // Buggy code: does not return here
    }
    
    // Continues even if jdi is NULL
    jdi_panel_disable(jdi);
}

int main() {
    printf("Triggering CVE-2026-43300 logic...\n");
    jdi_panel_dsi_remove(NULL);
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43300
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43300
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43300/
[4] VulDB https://vuldb.com/cve/CVE-2026-43300
[5] https://git.kernel.org/stable/c/2f5427d8726b22b807beec248d7d6bf88e291e0b
[6] https://git.kernel.org/stable/c/83ce0085fabf757b039322928188ad78e962d609
[7] https://git.kernel.org/stable/c/95eed73b871111123a8b1d31cb1fce7e902e49ea
[8] https://git.kernel.org/stable/c/ec2f37bbb733cdd7ed7d04171fca728a532414d5

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43300", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-08T14:16:37.223", "lastModified": "2026-05-15T14:04:19.723", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/panel: Fix a possible null-pointer dereference in jdi_panel_dsi_remove()\n\nIn jdi_panel_dsi_remove(), jdi is explicitly checked, indicating that it\nmay be NULL:\n\n if (!jdi)\n mipi_dsi_detach(dsi);\n\nHowever, when jdi is NULL, the function does not return and continues by\ncalling jdi_panel_disable():\n\n err = jdi_panel_disable(&jdi->base);\n\nInside jdi_panel_disable(), jdi is dereferenced unconditionally, which can\nlead to a NULL-pointer dereference:\n\n struct jdi_panel *jdi = to_panel_jdi(panel);\n backlight_disable(jdi->backlight);\n\nTo prevent such a potential NULL-pointer dereference, return early from\njdi_panel_dsi_remove() when jdi is NULL."}], "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:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.75", "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2f5427d8726b22b807beec248d7d6bf88e291e0b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/83ce0085fabf757b039322928188ad78e962d609", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/95eed73b871111123a8b1d31cb1fce7e902e49ea", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ec2f37bbb733cdd7ed7d04171fca728a532414d5", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}