CVE-2026-43460

Description

In the Linux kernel, the following vulnerability has been resolved: spi: rockchip-sfc: Fix double-free in remove() callback The driver uses devm_spi_register_controller() for registration, which automatically unregisters the controller via devm cleanup when the device is removed. The manual call to spi_unregister_controller() in the remove() callback can lead to a double-free. And to make sure controller is unregistered before DMA buffer is unmapped, switch to use spi_register_controller() in probe().

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:7.0:rc1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* - VULNERABLE

Linux Kernel < v6.9 (Commit 111e2863372c)

Linux Kernel < v6.8 (Commit 85fb53351e6a)

Linux Kernel < v6.6 (Commit b6051f2bdd4b)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * Conceptual PoC for Vulnerable Logic
 * This demonstrates the double-free scenario in rockchip-sfc driver.
 */

#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/platform_device.h>

static int probe(struct platform_device *pdev)
{
    struct spi_controller *ctrl;
    // Allocate controller
    ctrl = spi_alloc_controller(&pdev->dev, 0);
    if (!ctrl) return -ENOMEM;

    // VULNERABILITY: Using managed register which auto-cleans on remove
    return devm_spi_register_controller(&pdev->dev, ctrl);
}

static int remove(struct platform_device *pdev)
{
    struct spi_controller *ctrl = platform_get_drvdata(pdev);

    // VULNERABILITY: Manual unregister causes Double Free
    // because devm_spi_register_controller already queued a cleanup.
    spi_unregister_controller(ctrl);

    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43460
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43460
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43460/
[4] VulDB https://vuldb.com/cve/CVE-2026-43460
[5] https://git.kernel.org/stable/c/111e2863372c322e836e0c896f6dd9cf4ee08c71
[6] https://git.kernel.org/stable/c/85fb53351e6a3b921357a2178671e847a087e400
[7] https://git.kernel.org/stable/c/b6051f2bdd4bd3dde85b68558edd3a6843489221

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43460", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-08T15:16:58.880", "lastModified": "2026-05-20T18:50:11.847", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: rockchip-sfc: Fix double-free in remove() callback\n\nThe driver uses devm_spi_register_controller() for registration, which\nautomatically unregisters the controller via devm cleanup when the\ndevice is removed. The manual call to spi_unregister_controller() in\nthe remove() callback can lead to a double-free.\n\nAnd to make sure controller is unregistered before DMA buffer is\nunmapped, switch to use spi_register_controller() in probe()."}], "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-415"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.18.19", "matchCriteriaId": "7484E98E-61F0-4DCE-9DBF-83D2F75F99EB"}, {"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: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/111e2863372c322e836e0c896f6dd9cf4ee08c71", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/85fb53351e6a3b921357a2178671e847a087e400", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b6051f2bdd4bd3dde85b68558edd3a6843489221", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}