CVE-2026-31745

/* * PoC Simulation for CVE-2026-31745 * Demonstrating the double free logic in the error path. * This is a simulation of the kernel vulnerable code flow. */ #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulating kernel structures struct auxiliary_device { char name[32]; }; // Simulating the release callback void reset_gpio_aux_device_release(struct auxiliary_device *adev) { printf("[Release] Freeing adev at %p\n", (void*)adev); free(adev); } // Simulating auxiliary_device_uninit -> puts device -> triggers release void auxiliary_device_uninit(struct auxiliary_device *adev) { reset_gpio_aux_device_release(adev); } // Simulating __auxiliary_device_add failure int __auxiliary_device_add(struct auxiliary_device *adev) { // Force failure to trigger the error path return -EINVAL; } // The vulnerable function logic void reset_add_gpio_aux_device() { struct auxiliary_device *adev; int ret; // Allocation adev = (struct auxiliary_device *)malloc(sizeof(struct auxiliary_device)); if (!adev) return; strcpy(adev->name, "gpio_reset"); printf("[Init] Allocated adev at %p\n", (void*)adev); // Initialization (implied success for PoC) // Attempt to add device ret = __auxiliary_device_add(adev); if (ret) { printf("[Error] __auxiliary_device_add failed with code %d\n", ret); // VULNERABLE PATH START auxiliary_device_uninit(adev); // This calls kfree(adev) internally printf("[Vuln] Calling kfree(adev) again...\n"); // kfree(adev); // The bug is here, uncommenting causes double free free(adev); // Simulating the second free // VULNERABLE PATH END printf("[Vuln] Double free occurred. Heap corruption likely.\n"); return; } } int main() { reset_add_gpio_aux_device(); return 0; }

{"cve": {"id": "CVE-2026-31745", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-01T15:16:37.260", "lastModified": "2026-05-07T19:31:28.120", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nreset: gpio: fix double free in reset_add_gpio_aux_device() error path\n\nWhen __auxiliary_device_add() fails, reset_add_gpio_aux_device()\ncalls auxiliary_device_uninit(adev).\n\nThe device release callback reset_gpio_aux_device_release() frees\nadev, but the current error path then calls kfree(adev) again,\ncausing a double free.\n\nKeep kfree(adev) for the auxiliary_device_init() failure path, but\navoid freeing adev after auxiliary_device_uninit()."}], "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": "6.19", "versionEndExcluding": "6.19.12", "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36"}, {"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/1de465753220deb41569cf2add87bbb0673731db", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/fbffb8c7c7bb4d38e9f65e0bee446685011de5d8", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}