https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Sat, 03 Oct 2026 05:53:41 +0000 https://vulnerability.circl.lu/vuln/cve-2025-21704 <p><strong>Affected:</strong> Linux, Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>usb: cdc-acm: Check control transfer buffer size before access</p> <p>If the first fragment is shorter than struct usb_cdc_notification, we can&#39;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-&gt;nb_index` to wrap.</p> <p>This issue has been present since the beginning of git history; however, it only leads to memory corruption since commit ea2583529cd1 (&#34;cdc-acm: reassemble fragmented notifications&#34;).</p> <p>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&#39;s vendor/product IDs and its other interfaces.</p> <p><strong>Affected:</strong> Linux, Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>usb: cdc-acm: Check control transfer buffer size before access</p> <p>If the first fragment is shorter than struct usb_cdc_notification, we can&#39;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-&gt;nb_index` to wrap.</p> <p>This issue has been present since the beginning of git history; however, it only leads to memory corruption since commit ea2583529cd1 (&#34;cdc-acm: reassemble fragmented notifications&#34;).</p> <p>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&#39;s vendor/product IDs and its other interfaces.</p> https://vulnerability.circl.lu/vuln/cve-2025-21704