CVE-2026-64565

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()<br /> <br /> The `ims_pcu_process_data()` processes incoming URB data byte by byte.<br /> However, it fails to check if the `read_pos` index exceeds<br /> IMS_PCU_BUF_SIZE.<br /> <br /> If a malicious USB device sends a packet larger than IMS_PCU_BUF_SIZE,<br /> `read_pos` will increment indefinitely. Moreover, since `read_pos` is<br /> located immediately after `read_buf`, the attacker can overwrite<br /> `read_pos` itself to arbitrarily control the index.<br /> <br /> This manipulated `read_pos` is subsequently used in<br /> `ims_pcu_handle_response()` to copy data into `cmd_buf`, leading to a<br /> heap buffer overflow.<br /> <br /> Specifically, an attacker can overwrite the `cmd_done.wait.head` located<br /> at offset 136 relative to `cmd_buf` in the `ims_pcu_handle_response()`.<br /> Consequently, when the driver calls `complete(&amp;pcu-&gt;cmd_done)`, it<br /> triggers a control flow hijack by using the manipulated pointer.<br /> <br /> Fix this by adding a bounds check for `read_pos` before writing to<br /> `read_buf`. If the packet is too long, discard it, log a warning,<br /> and reset the parser state.<br /> <br /> [dtor: factor out resetting packet state, reset checksum as well]