CVE-2026-43170

/* * PoC for CVE-2026-43170: Triggering atomic context sleep in dwc3 * This is a conceptual demonstration. On a vulnerable system, * interacting with the USB gadget power settings can trigger a crash. */ #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #define GADGET_PATH "/sys/class/udc/" // Example path, varies by system int main() { printf("Attempting to trigger CVE-2026-43170...\n"); // In a real scenario, this would involve specific ioctl calls or // sysfs writes that trigger dwc3_gadget_vbus_draw from an atomic context. // For example, rapid state changes or power draw requests. int fd = open(GADGET_PATH, O_WRONLY); if (fd < 0) { perror("Failed to open gadget interface"); return 1; } // Simulate triggering the vbus draw logic // Note: Actual reproduction requires specific hardware and kernel config. write(fd, "trigger", 7); close(fd); printf("Check dmesg for kernel panic or 'Scheduling while atomic'.\n"); return 0; }

{"cve": {"id": "CVE-2026-43170", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:35.320", "lastModified": "2026-05-13T14:52:52.250", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: gadget: Move vbus draw to workqueue context\n\nCurrently dwc3_gadget_vbus_draw() can be called from atomic\ncontext, which in turn invokes power-supply-core APIs. And\nsome these PMIC APIs have operations that may sleep, leading\nto kernel panic.\n\nFix this by moving the vbus_draw into a workqueue context."}], "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": "5.13", "versionEndExcluding": "6.6.128", "matchCriteriaId": "F8417E1B-91C8-497E-AA0A-CB8A761DC250"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.75", "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B"}, {"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/2333653ef854c2cc124077f71a8526f03bf6e06a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/54aaa3b387c2f580a99dc86a9cc2eb6dfaf599a7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/74a231e3d99d310497ab0ccb359539a6063b316a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/76c1123ffccfaba95cf4ecc2a50f95504a522424", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a7a80c25b65112768eeba58a7af129d3c52a6d90", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}