CVE-2025-21704 - Linux Kernel usb-cdc-acm Memory Corruption Vulnerability

CVE-2025-21704 - Linux Kernel usb-cdc-acm Memory Corruption Vulnerability

https://cvefeed.io/rssfeed/latest.atom / Sat, 02/22/2025 - 14:48
CVE ID : CVE-2025-21704
Published : Feb. 22, 2025, 10:15 a.m. | 1 hour, 38 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: usb: cdc-acm: Check control transfer buffer size before access If the first fragment is shorter than struct usb_cdc_notification, we can't calculate an expected_size. Log an error and discard the notification instead of reading lengths from memory outside the received data, which can lead to memory corruption when the expected_size decreases between fragments, causing `expected_size - acm->nb_index` to wrap. This issue has been present since the beginning of git history; however, it only leads to memory corruption since commit ea2583529cd1 ("cdc-acm: reassemble fragmented notifications"). A mitigating factor is that acm_ctrl_irq() can only execute after userspace has opened /dev/ttyACM*; but if ModemManager is running, ModemManager will do that automatically depending on the USB device's vendor/product IDs and its other interfaces.
Severity: 0.0 | NA
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