CVE-2026-43372

Description

In the Linux kernel, the following vulnerability has been resolved: net: dsa: microchip: Fix error path in PTP IRQ setup If request_threaded_irq() fails during the PTP message IRQ setup, the newly created IRQ mapping is never disposed. Indeed, the ksz_ptp_irq_setup()'s error path only frees the mappings that were successfully set up. Dispose the newly created mapping if the associated request_threaded_irq() fails at setup.

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（修复补丁发布前的版本）

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC Concept for CVE-2026-43372 (Logic Simulation)
 * This code demonstrates the flawed logic in ksz_ptp_irq_setup.
 * In a real scenario, this requires specific hardware.
 */

#include <linux/module.h>
#include <linux/irq.h>
#include <linux/interrupt.h>

struct mock_data {
    int irq_base;
    int count;
};

static irqreturn_t mock_handler(int irq, void *dev_id)
{
    return IRQ_HANDLED;
}

/*
 * Simulates the vulnerable function logic
 */
int vulnerable_setup(struct mock_data *data)
{
    int ret, i;
    
    // Simulate creating a new IRQ mapping
    int new_irq = data->irq_base + data->count;
    
    // Simulate request_threaded_irq failing
    ret = request_threaded_irq(new_irq, NULL, mock_handler, IRQF_SHARED, "mock", data);
    if (ret) {
        // VULNERABILITY: The new_irq mapping is not disposed here.
        // The error path only frees previously set up mappings.
        printk(KERN_ERR "IRQ setup failed for %d, leaking resource\n", new_irq);
        return ret;
    }
    
    data->count++;
    return 0;
}

/*
 * Patched logic would involve freeing the mapping here before returning error.
 */

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43372
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43372
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43372/
[4] VulDB https://vuldb.com/cve/CVE-2026-43372
[5] https://git.kernel.org/stable/c/3704ac6a0d9a78f66a187515a8ca3faedaf01cc5
[6] https://git.kernel.org/stable/c/6c58a9fdb0d0e1011aa02455d26d6ebea251979b
[7] https://git.kernel.org/stable/c/99c8c16a4aad0b37293cae213e15957c573cf79b
[8] https://git.kernel.org/stable/c/c2d1d41e0e8ec447d40a5752844fc5fb0b23db27
[9] https://git.kernel.org/stable/c/e80fef36c676c947072dabeb5803ae59d92ba493

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43372", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-08T15:16:48.313", "lastModified": "2026-05-15T15:17:06.590", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: microchip: Fix error path in PTP IRQ setup\n\nIf request_threaded_irq() fails during the PTP message IRQ setup, the\nnewly created IRQ mapping is never disposed. Indeed, the\nksz_ptp_irq_setup()'s error path only frees the mappings that were\nsuccessfully set up.\n\nDispose the newly created mapping if the associated\nrequest_threaded_irq() fails at setup."}], "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": "6.6.119", "versionEndExcluding": "6.6.130", "matchCriteriaId": "C1C9DEB9-FA01-469C-B73C-2EDC4404EAA3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.61", "versionEndExcluding": "6.12.78", "matchCriteriaId": "F0CD1D61-E86A-41B8-87F7-B60F87EC5717"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17.11", "versionEndExcluding": "6.18", "matchCriteriaId": "4F94524C-FCFA-40B0-BFBB-176385BE0D5D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.1", "versionEndExcluding": "6.18.19", "matchCriteriaId": "6F718F75-20D5-4D17-B698-1D1BD5FDE294"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.9", "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.18:-:*:*:*:*:*:*", "matchCriteriaId": "DCE57113-2223-4308-A0F2-5E6ECFBB3C23"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3704ac6a0d9a78f66a187515a8ca3faedaf01cc5", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/6c58a9fdb0d0e1011aa02455d26d6ebea251979b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/99c8c16a4aad0b37293cae213e15957c573cf79b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c2d1d41e0e8ec447d40a5752844fc5fb0b23db27", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e80fef36c676c947072dabeb5803ae59d92ba493", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}