CVE-2026-31687

Description

In the Linux kernel, the following vulnerability has been resolved: gpio: omap: do not register driver in probe() Commit 11a78b794496 ("ARM: OMAP: MPUIO wake updates") registers the omap_mpuio_driver from omap_mpuio_init(), which is called from omap_gpio_probe(). However, it neither makes sense to register drivers from probe() callbacks of other drivers, nor does the driver core allow registering drivers with a device lock already being held. The latter was revealed by commit dc23806a7c47 ("driver core: enforce device_lock for driver_match_device()") leading to a potential deadlock condition described in [1]. Additionally, the omap_mpuio_driver is never unregistered from the driver core, even if the module is unloaded. Hence, register the omap_mpuio_driver from the module initcall and unregister it in module_exit().

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 (包含commit 11a78b794496的版本)

Linux Kernel stable series (修复前版本)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC for CVE-2026-31687: Linux Kernel OMAP GPIO Deadlock
 * This PoC attempts to trigger the probe logic that causes the deadlock.
 * Note: Requires specific hardware (OMAP) and kernel configuration.
 */
#include <linux/module.h>
#include <linux/platform_device.h>

static int __init poc_init(void) {
    // Triggering the module load or device bind which calls omap_gpio_probe
    // The deadlock occurs inside omap_gpio_probe -> omap_mpuio_init
    printk(KERN_INFO "CVE-2026-31687 PoC: Triggering OMAP GPIO probe\n");
    // Code to bind device or load module would go here
    return 0;
}

static void __exit poc_exit(void) {
    printk(KERN_INFO "CVE-2026-31687 PoC: Exit\n");
}

module_init(poc_init);
module_exit(poc_exit);
MODULE_LICENSE("GPL");

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-31687
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-31687
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-31687/
[4] VulDB https://vuldb.com/cve/CVE-2026-31687
[5] https://git.kernel.org/stable/c/03db4dc9ad6eb91e640b517e00373ce877682854
[6] https://git.kernel.org/stable/c/1c04c3a4de8d4bcb9202f94c44f26c57c2572308
[7] https://git.kernel.org/stable/c/2211d77892913804d16c28c7415b82804ab1e54c
[8] https://git.kernel.org/stable/c/32f08c3ddd6dda6cbb6c9d715de10f21dccde50f
[9] https://git.kernel.org/stable/c/53a76425e0764421ba93bb9045d2e454667d5687
[10] https://git.kernel.org/stable/c/57bcd3feffa79544c73a1a1872472389a391cc79
[11] https://git.kernel.org/stable/c/673dafb9a86349a12a93151fd467625614dc7e12
[12] https://git.kernel.org/stable/c/730e5ebff40c852e3ea57b71bf02a4b89c69435f
[13] https://git.kernel.org/stable/c/86588916e1887a5edb8a9161cd7ae81e47a7ed25
[14] https://git.kernel.org/stable/c/a29215961d833f4de33a09c3964d31ebc6083033

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-31687", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-27T18:16:54.143", "lastModified": "2026-05-06T19:05:57.627", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: omap: do not register driver in probe()\n\nCommit 11a78b794496 (\"ARM: OMAP: MPUIO wake updates\") registers the\nomap_mpuio_driver from omap_mpuio_init(), which is called from\nomap_gpio_probe().\n\nHowever, it neither makes sense to register drivers from probe()\ncallbacks of other drivers, nor does the driver core allow registering\ndrivers with a device lock already being held.\n\nThe latter was revealed by commit dc23806a7c47 (\"driver core: enforce\ndevice_lock for driver_match_device()\") leading to a potential deadlock\ncondition described in [1].\n\nAdditionally, the omap_mpuio_driver is never unregistered from the\ndriver core, even if the module is unloaded.\n\nHence, register the omap_mpuio_driver from the module initcall and\nunregister it in module_exit()."}], "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-667"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "5.10.251", "matchCriteriaId": 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(truncated)