{"uuid": "4803b684-0949-40e1-adf5-7f9bfb53315f", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21704", "type": "seen", "source": "https://t.me/DarkWebInformer_CVEAlerts/5019", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2025-21704\n\ud83d\udd25 CVSS Score: N/A\n\ud83d\udd39 Description: In the Linux kernel, the following vulnerability has been resolved:\n\nusb: cdc-acm: Check control transfer buffer size before access\n\nIf the first fragment is shorter than struct usb_cdc_notification, we can't\ncalculate an expected_size. Log an error and discard the notification\ninstead of reading lengths from memory outside the received data, which can\nlead to memory corruption when the expected_size decreases between\nfragments, causing `expected_size - acm->nb_index` to wrap.\n\nThis issue has been present since the beginning of git history; however,\nit only leads to memory corruption since commit ea2583529cd1\n(\"cdc-acm: reassemble fragmented notifications\").\n\nA mitigating factor is that acm_ctrl_irq() can only execute after userspace\nhas opened /dev/ttyACM*; but if ModemManager is running, ModemManager will\ndo that automatically depending on the USB device's vendor/product IDs and\nits other interfaces.\n\ud83d\udccf Published: 2025-02-22T09:43:37.377Z\n\ud83d\udccf Modified: 2025-02-22T09:43:37.377Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/stable/c/7828e9363ac4d23b02419bf2a45b9f1d9fb35646\n2. https://git.kernel.org/stable/c/6abb510251e75f875797d8983a830e6731fa281c\n3. https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636\n4. https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831\n5. https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01", "creation_timestamp": "2025-02-22T10:26:05.000000Z"}