CVE-2026-43369

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd: Fix NULL pointer dereference in device cleanup When GPU initialization fails due to an unsupported HW block IP blocks may have a NULL version pointer. During cleanup in amdgpu_device_fini_hw, the code calls amdgpu_device_set_pg_state and amdgpu_device_set_cg_state which iterate over all IP blocks and access adev->ip_blocks[i].version without NULL checks, leading to a kernel NULL pointer dereference. Add NULL checks for adev->ip_blocks[i].version in both amdgpu_device_set_cg_state and amdgpu_device_set_pg_state to prevent dereferencing NULL pointers during GPU teardown when initialization has failed. (cherry picked from commit b7ac77468cda92eecae560b05f62f997a12fe2f2)

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 (具体受影响版本请参考Git提交记录)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * Conceptual PoC for CVE-2026-43369
 * This C code simulates the vulnerable logic in the Linux Kernel.
 */

struct ip_block {
    void *version; // Can be NULL if init fails
};

struct amdgpu_device {
    struct ip_block *ip_blocks;
    int num_ip_blocks;
};

void vulnerable_cleanup(struct amdgpu_device *adev) {
    for (int i = 0; i < adev->num_ip_blocks; i++) {
        // VULNERABILITY: Direct access without NULL check
        printf("Checking version: %p\n", adev->ip_blocks[i].version);
        // If version is NULL, accessing its members causes a crash/OOPS
        // int status = adev->ip_blocks[i].version->status; 
    }
}

/*
 * Trigger:
 * 1. Attacker causes GPU init failure (e.g., specific hardware interaction).
 * 2. Kernel calls cleanup path.
 * 3. vulnerable_cleanup is executed with a NULL version pointer.
 * 4. Kernel Panic occurs.
 */

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43369
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43369
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43369/
[4] VulDB https://vuldb.com/cve/CVE-2026-43369
[5] https://git.kernel.org/stable/c/062ea905fff7756b2e87143ffccaece5cdb44267
[6] https://git.kernel.org/stable/c/43025c941aced9a9009f9ff20eea4eb78c61deb8
[7] https://git.kernel.org/stable/c/767cd24d3c4ae847688877def4891943f6611ecd

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43369", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-08T15:16:47.960", "lastModified": "2026-05-15T15:18:29.900", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd: Fix NULL pointer dereference in device cleanup\n\nWhen GPU initialization fails due to an unsupported HW block\nIP blocks may have a NULL version pointer. During cleanup in\namdgpu_device_fini_hw, the code calls amdgpu_device_set_pg_state and\namdgpu_device_set_cg_state which iterate over all IP blocks and access\nadev->ip_blocks[i].version without NULL checks, leading to a kernel\nNULL pointer dereference.\n\nAdd NULL checks for adev->ip_blocks[i].version in both\namdgpu_device_set_cg_state and amdgpu_device_set_pg_state to prevent\ndereferencing NULL pointers during GPU teardown when initialization has\nfailed.\n\n(cherry picked from commit b7ac77468cda92eecae560b05f62f997a12fe2f2)"}], "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": "6.18.16", "versionEndExcluding": "6.18.19", "matchCriteriaId": "0CED11FB-4FAA-4224-93EC-23FC2358D4C7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.6", "versionEndExcluding": "6.19.9", "matchCriteriaId": "2CFC1CE8-19E1-4AFC-BF52-43BDD2561EE6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/062ea905fff7756b2e87143ffccaece5cdb44267", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/43025c941aced9a9009f9ff20eea4eb78c61deb8", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/767cd24d3c4ae847688877def4891943f6611ecd", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}