CVE-2026-31524

Description

In the Linux kernel, the following vulnerability has been resolved: HID: asus: avoid memory leak in asus_report_fixup() The asus_report_fixup() function was returning a newly allocated kmemdup()-allocated buffer, but never freeing it. Switch to devm_kzalloc() to ensure the memory is managed and freed automatically when the device is removed. The caller of report_fixup() does not take ownership of the returned pointer, but it is permitted to return a pointer whose lifetime is at least that of the input buffer. Also fix a harmless out-of-bounds read by copying only the original descriptor size.

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 prior to commit 2bad24c17742fc88973d6aea526ce1353f5334a3)

Linux Kernel (Versions prior to commit 2e4fe6b15c2f390c023b20d728b1a3fe7ea4f973)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC Concept: Triggering Memory Leak in HID ASUS Driver
 * This code simulates the logic of repeatedly triggering the vulnerable function.
 * Actual exploitation requires physical access to the vulnerable ASUS HID device.
 */

#include <linux/module.h>
#include <linux/hid.h>

// Simulated vulnerable function logic (Before Patch)
void *vulnerable_asus_report_fixup(struct hid_device *hdev, __u8 *rdesc, unsigned int *rsize) {
    // Allocating memory without a corresponding free mechanism in the caller/context
    __u8 *new_rdesc = kmemdup(rdesc, *rsize, GFP_KERNEL);
    if (!new_rdesc)
        return NULL;

    // Simulate modification (Out-of-bounds read risk if size is wrong)
    // ... modification logic ...

    return new_rdesc; // Memory leaked here if caller doesn't free
}

// Attack Loop Simulation
void trigger_leak(struct hid_device *hdev) {
    int i;
    __u8 dummy_desc[] = {0x01, 0x02};
    unsigned int size = sizeof(dummy_desc);

    for (i = 0; i < 10000; i++) {
        // In a real scenario, this is called via device interaction
        void *leaked_ptr = vulnerable_asus_report_fixup(hdev, dummy_desc, &size);
        // Pointer is lost here, memory leaked
    }
    printk(KERN_INFO "POC: Memory leaked potentially %d times\n", 10000);
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-31524
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-31524
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-31524/
[4] VulDB https://vuldb.com/cve/CVE-2026-31524
[5] https://git.kernel.org/stable/c/2bad24c17742fc88973d6aea526ce1353f5334a3
[6] https://git.kernel.org/stable/c/2e4fe6b15c2f390c023b20d728b1a3fe7ea4f973
[7] https://git.kernel.org/stable/c/726765b43deb2b4723869d673cc5fc6f7a3b2059
[8] https://git.kernel.org/stable/c/7a6d6e4d8af044f94fa97e97af5ff2771e1fbebd
[9] https://git.kernel.org/stable/c/84724ac4821a160d47b84289adf139023027bdbb
[10] https://git.kernel.org/stable/c/a41cc7c1668e44ff2c2d36f9a6353253ffc43e3c
[11] https://git.kernel.org/stable/c/ede95cfcab8064d9a08813fbd7ed42cea8843dcf
[12] https://git.kernel.org/stable/c/f20f17cffbe34fb330267e0f8084f5565f807444

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-31524", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-22T14:16:52.430", "lastModified": "2026-04-28T18:07:48.083", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: asus: avoid memory leak in asus_report_fixup()\n\nThe asus_report_fixup() function was returning a newly allocated\nkmemdup()-allocated buffer, but never freeing it. Switch to\ndevm_kzalloc() to ensure the memory is managed and freed automatically\nwhen the device is removed.\n\nThe caller of report_fixup() does not take ownership of the returned\npointer, but it is permitted to return a pointer whose lifetime is at\nleast that of the input buffer.\n\nAlso fix a harmless out-of-bounds read by copying only the original\ndescriptor size."}], "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": "4.14", "versionEndExcluding": "5.10.253", "matchCriteriaId": "7144BCBC-124B-49FA-8BCC-259910F77E5A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.203", "matchCriteriaId": "20DDB3E9-AABF-4107-ADB0-5362AA067045"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.168", "matchCriteriaId": "E2DDDCA1-6DAB-4018-B920-8F045DDD8D3B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.131", "matchCriteriaId": "CE6ED4D4-0046-4573-BFA9-D64143B6A89F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.80", "matchCriteriaId": "97EB19EC-A11E-49C6-9D2F-6F6EC6CB98B6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.21", "matchCriteriaId": "ED39847A-3B46-4729-B7CA-B2C30B9FA8FE"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.11", "matchCriteriaId": "4CA2E747-A9EC-4518-9AA2-B4247FC748B7"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2bad24c17742fc88973d6aea526ce1353f5334a3", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/2e4fe6b15c2f390c023b20d728b1a3fe7ea4f973", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/726765b43deb2b4723869d673cc5fc6f7a3b2059", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/7a6d6e4d8af044f94fa97e97af5ff2771e1fbebd", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/84724ac4821a160d47b84289adf139023027bdbb", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a41cc7c1668e44ff2c2d36f9a6353253ffc43e3c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ede95cfcab8064d9a08813fbd7ed42cea8843dcf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/f20f17cffbe34fb330267e0f8084f5565f807444", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}