CVE-2026-31783

Description

In the Linux kernel, the following vulnerability has been resolved: spi: amlogic: spifc-a4: unregister ECC engine on probe failure and remove() callback aml_sfc_probe() registers the on-host NAND ECC engine, but teardown was missing from both probe unwind and remove-time cleanup. Add a devm cleanup action after successful registration so nand_ecc_unregister_on_host_hw_engine() runs automatically on probe failures and during device removal.

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

cpe:2.3:o:linux:linux_kernel:6.18:-:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* - VULNERABLE

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

Linux Kernel (修复补丁提交前版本)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC Concept for CVE-2026-31783
 * This snippet demonstrates the missing cleanup logic.
 * Triggering this requires root access and specific hardware to load/unload the module.
 */

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

// Simulated vulnerable function flow
static int vulnerable_probe(struct platform_device *pdev)
{
    // Register ECC engine
    nand_ecc_register_on_host_hw_engine(pdev);

    // Simulate a failure after registration
    if (some_condition_fails()) {
        // BUG: Missing nand_ecc_unregister_on_host_hw_engine(pdev) here
        return -ENOMEM;
    }

    return 0;
}

// Local trigger script (bash)
/*
while true; do
  echo spi-amlogic-spifc-a4 > /sys/bus/platform/drivers/spi-amlogic-spifc-a4/unbind
  echo spi-amlogic-spifc-a4 > /sys/bus/platform/drivers/spi-amlogic-spifc-a4/bind
done
*/

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-31783
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-31783
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-31783/
[4] VulDB https://vuldb.com/cve/CVE-2026-31783
[5] https://git.kernel.org/stable/c/5e11741aec3b242a197250b473c37b58f53a16b6
[6] https://git.kernel.org/stable/c/b0dc7e7c56573e7a52080f25f3179a45f3dd7e6f
[7] https://git.kernel.org/stable/c/ee4c064e37d4d0ddc5a7580933dbe79a2c6acafc

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-31783", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-01T15:16:41.813", "lastModified": "2026-05-11T20:47:03.257", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: amlogic: spifc-a4: unregister ECC engine on probe failure and remove() callback\n\naml_sfc_probe() registers the on-host NAND ECC engine, but teardown was\nmissing from both probe unwind and remove-time cleanup. Add a devm cleanup\naction after successful registration so\nnand_ecc_unregister_on_host_hw_engine() runs automatically on probe\nfailures and during device removal."}], "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": "6.18.1", "versionEndExcluding": "6.18.22", "matchCriteriaId": "BF0DA3C1-164D-4E48-AFBD-FE1A0F1A543C"}, {"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: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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5e11741aec3b242a197250b473c37b58f53a16b6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b0dc7e7c56573e7a52080f25f3179a45f3dd7e6f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ee4c064e37d4d0ddc5a7580933dbe79a2c6acafc", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}