CVE-2026-31759

/* * PoC snippet demonstrating the double free logic vulnerability * in Linux kernel usb: ulpi driver (CVE-2026-31759). * This simulates the error path in ulpi_register_interface(). */ #include <linux/module.h> #include <linux/usb/ulpi.h> void simulate_vulnerability() { struct ulpi *ulpi = kzalloc(sizeof(*ulpi), GFP_KERNEL); if (!ulpi) return; // Simulate device initialization and registration attempt int ret = device_register(&ulpi->dev); if (ret) { // Step 1: put_device calls ulpi_dev_release which does kfree(ulpi) put_device(&ulpi->dev); // Step 2: Double Free bug - kfree(ulpi) is called again immediately kfree(ulpi); // <--- VULNERABILITY HERE } } // Note: This is a simplified logic representation for analysis purposes.

{"cve": {"id": "CVE-2026-31759", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-01T15:16:38.923", "lastModified": "2026-05-08T18:20:18.230", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: ulpi: fix double free in ulpi_register_interface() error path\n\nWhen device_register() fails, ulpi_register() calls put_device() on\nulpi->dev.\n\nThe device release callback ulpi_dev_release() drops the OF node\nreference and frees ulpi, but the current error path in\nulpi_register_interface() then calls kfree(ulpi) again, causing a\ndouble free.\n\nLet put_device() handle the cleanup through ulpi_dev_release() and\navoid freeing ulpi again in ulpi_register_interface()."}], "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": "4.2", "versionEndExcluding": "5.10.253", "matchCriteriaId": "CC85AD7F-B910-43F1-9A7F-94BC2781DACB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.203", "matchCriteriaId": "20DDB3E9-AABF-4107-ADB0-5362AA067045"}, {"vulnerable": true, "criteria": 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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ee248e6e941e4f2e634df2bd43e5f1ef810ab6df ... 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