CVE-2026-43219

Description

In the Linux kernel, the following vulnerability has been resolved: net: cpsw_new: Fix potential unregister of netdev that has not been registered yet If an error occurs during register_netdev() for the first MAC in cpsw_register_ports(), even though cpsw->slaves[0].ndev is set to NULL, cpsw->slaves[1].ndev would remain unchanged. This could later cause cpsw_unregister_ports() to attempt unregistering the second MAC. To address this, add a check for ndev->reg_state before calling unregister_netdev(). With this change, setting cpsw->slaves[i].ndev to NULL becomes unnecessary and can be removed accordingly.

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 < Commit 29739ec197ed66535bc0b86f14ab66c5f4512138

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC Concept for CVE-2026-43219
 * Triggering the error path in cpsw_register_ports
 */

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

// This is a conceptual trigger. In a real scenario,
// one would need to load the cpsw_new driver and force
// a registration failure on the first port.

int init_module(void) {
    printk(KERN_INFO "Attempting to trigger CPSW vulnerability\n");
    // Logic to bind device and force register_netdev() failure
    // would go here. This requires specific hardware or emulation.
    return 0;
}

void cleanup_module(void) {
    printk(KERN_INFO "Cleaning up\n");
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43219
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43219
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43219/
[4] VulDB https://vuldb.com/cve/CVE-2026-43219
[5] https://git.kernel.org/stable/c/29739ec197ed66535bc0b86f14ab66c5f4512138
[6] https://git.kernel.org/stable/c/349c4cac6f54a81fc107589771f88136a2b20415
[7] https://git.kernel.org/stable/c/9d724b34fbe13b71865ad0906a4be97571f19cf5

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43219", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:41.543", "lastModified": "2026-05-12T19:12:37.900", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: cpsw_new: Fix potential unregister of netdev that has not been registered yet\n\nIf an error occurs during register_netdev() for the first MAC in\ncpsw_register_ports(), even though cpsw->slaves[0].ndev is set to NULL,\ncpsw->slaves[1].ndev would remain unchanged. This could later cause\ncpsw_unregister_ports() to attempt unregistering the second MAC.\nTo address this, add a check for ndev->reg_state before calling\nunregister_netdev(). With this change, setting cpsw->slaves[i].ndev\nto NULL becomes unnecessary and can be removed accordingly."}], "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": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "6.18.16", "matchCriteriaId": "59AFA620-05EF-48C6-B742-D356BCBE7D2F"}, {"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/29739ec197ed66535bc0b86f14ab66c5f4512138", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/349c4cac6f54a81fc107589771f88136a2b20415", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/9d724b34fbe13b71865ad0906a4be97571f19cf5", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}