CVE-2026-31604

/* * Conceptual PoC for Reference Leak in rtw88 driver * This simulates the logic flaw where a reference is taken * but not released on error paths. */ #include <linux/module.h> #include <linux/usb.h> static int probe_leak_simulation(struct usb_interface *intf, const struct usb_device_id *id) { struct usb_device *udev = interface_to_usbdev(intf); // Simulate taking a reference (Vulnerability: redundant ref) usb_get_dev(udev); // Simulate an error condition (e.g., descriptor parsing failure) if (1) { // Vulnerability: Missing usb_put_dev(udev) here before returning error return -ENODEV; } // Normal path would release it usb_put_dev(udev); return 0; } // Module init/exit omitted for brevity // In a real scenario, this requires specific hardware to trigger.

{"cve": {"id": "CVE-2026-31604", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-24T15:16:39.627", "lastModified": "2026-04-29T19:21:26.807", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw88: fix device leak on probe failure\n\nDriver core holds a reference to the USB interface and its parent USB\ndevice while the interface is bound to a driver and there is no need to\ntake additional references unless the structures are needed after\ndisconnect.\n\nThis driver takes a reference to the USB device during probe but does\nnot to release it on all probe errors (e.g. when descriptor parsing\nfails).\n\nDrop the redundant device reference to fix the leak, reduce cargo\nculting, make it easier to spot drivers where an extra reference is\nneeded, and reduce the risk of further memory leaks."}], "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": "6.2", "versionEndExcluding": "6.6.136", "matchCriteriaId": "0A0F1E9A-F127-4699-A014-9E08441C9A14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.83", "matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.24", "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.14", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.0.1", "matchCriteriaId": "9B5888AB-7403-4335-89E4-21CC0B48366A"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/25a827b7e1d5747a255bdc757f1d3e9e1e8a4e2a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/89a9c1bc7d797120bcc290864e0cb10a440a677f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a4f4371d194dfa5473cc961f86194084b1b13a69", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/af7307e96dad00bcc2675dac650d8558a52f2c6f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/bbb15e71156cd9f5e1869eee7207a06ea8e96c39", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/f632987306bce9242cdfcf911ee0b2c9455e05a3", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}