CVE-2026-23431

Description

In the Linux kernel, the following vulnerability has been resolved: spi: amlogic-spisg: Fix memory leak in aml_spisg_probe() In aml_spisg_probe(), ctlr is allocated by spi_alloc_target()/spi_alloc_host(), but fails to call spi_controller_put() in several error paths. This leads to a memory leak whenever the driver fails to probe after the initial allocation. Convert to use devm_spi_alloc_host()/devm_spi_alloc_target() to fix the memory leak.

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:6.17:-:*:*:*:*:*:* - 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 (versions containing vulnerable amlogic-spisg driver prior to patch)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC Concept: Demonstrating the memory leak logic.
 * This is a simplified representation of the vulnerability.
 */

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

// Simulated vulnerable function structure
static int vulnerable_probe(struct platform_device *pdev)
{
    struct spi_controller *ctlr;

    // Allocation happens
    ctlr = spi_alloc_host(&pdev->dev, sizeof(struct spi_controller));
    if (!ctlr)
        return -ENOMEM;

    // Simulate an error condition after allocation
    if (some_error_condition()) {
        // VULNERABILITY: Missing spi_controller_put(ctlr) here
        return -ENODEV; // Memory leaked
    }

    spi_controller_put(ctlr); // Correct path
    return 0;
}

/*
 * To exploit this on a real system, one would need to
 * trigger the amlogic-spisg driver to load and fail repeatedly,
 * monitoring kernel memory usage (e.g., via /proc/meminfo).
 */

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-23431
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-23431
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-23431/
[4] VulDB https://vuldb.com/cve/CVE-2026-23431
[5] https://git.kernel.org/stable/c/8e28a01b69f7ea8df7ceb15470cfe643b2828f4f
[6] https://git.kernel.org/stable/c/b8db9552997924b750e727a625a30eaa4603bbb9
[7] https://git.kernel.org/stable/c/bec21d97c968a4806939eb2946df49ea6c341bde

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-23431", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-03T16:16:24.493", "lastModified": "2026-04-23T21:00:59.380", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: amlogic-spisg: Fix memory leak in aml_spisg_probe()\n\nIn aml_spisg_probe(), ctlr is allocated by\nspi_alloc_target()/spi_alloc_host(), but fails to call\nspi_controller_put() in several error paths. This leads\nto a memory leak whenever the driver fails to probe after\nthe initial allocation.\n\nConvert to use devm_spi_alloc_host()/devm_spi_alloc_target()\nto fix the memory leak."}], "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": "CWE-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17.1", "versionEndExcluding": "6.18.20", "matchCriteriaId": "7ED31AF6-5D81-4EE0-84BE-89EDBCE41784"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.10", "matchCriteriaId": "96D34333-38BE-4414-9E79-6EB764329581"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*", "matchCriteriaId": "7CC8B11D-82DC-4958-8DC7-BF5CC829A5E9"}, {"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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8e28a01b69f7ea8df7ceb15470cfe643b2828f4f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b8db9552997924b750e727a625a30eaa4603bbb9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/bec21d97c968a4806939eb2946df49ea6c341bde", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}