CVE-2026-80827
UnknownSummary
In the Linux kernel, the USB: serial: option driver has a slab out-of-bounds read vulnerability in the interrupt URB callback. The interrupt buffer is allocated based on wMaxPacketSize, and when a device sends a short packet, the code reads beyond the allocated buffer. The fix adds missing bounds checks before accessing data.
Risk Assessment
The vulnerability could lead to information disclosure from kernel memory or a system crash if a malicious USB device sends a specially crafted packet.
Recommendation
Install a Linux kernel update containing the bounds check fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: USB: serial: option: fix slab OOB read in interrupt URB callback The interrupt URB buffer is allocated in setup_port_interrupt_in() based on the endpoint's wMaxPacketSize: buffer_size = usb_endpoint_maxp(epd); port->interrupt_in_buffer = kmalloc(buffer_size, GFP_KERNEL); When a USB device declares wMaxPacketSize = 8 on its interrupt IN endpoint, the buffer is allocated from kmalloc-8 cache (exactly 8 bytes). If the device sends a short packet (actual_length < wMaxPacketSize), the URB completes with status == 0 and the callback proceeds to read: data[sizeof(struct usb_ctrlrequest)] which evaluates to data[8], accessing 1 byte beyond the allocated 8-byte buffer. This results in a slab out-of-bounds read. Fix this by adding the missing bounds check: first verify that the actual length is large enough to contain the struct usb_ctrlrequest header before accessing req_pkt->bRequestType and req_pkt->bRequest, and then verify that there is an additional byte for the modem signal state before reading data[sizeof(struct usb_ctrlrequest)] inside the conditional. Use sizeof(*req_pkt) instead of sizeof(struct usb_ctrlrequest) for consistency. [ johan: use dev_err(); split signals declaration and initialisation ]
Vulnerability data from NVD (NIST) · CISA KEV · EPSS