{"cve":"CVE-2026-80827","nvd":{"published":"2026-09-04T16:18:10.683","modified":"2026-10-19T09:17:17.697","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: option: fix slab OOB read in interrupt URB callback\n\nThe interrupt URB buffer is allocated in setup_port_interrupt_in() based\non the endpoint's wMaxPacketSize:\n\n    buffer_size = usb_endpoint_maxp(epd);\n    port->interrupt_in_buffer = kmalloc(buffer_size, GFP_KERNEL);\n\nWhen a USB device declares wMaxPacketSize = 8 on its interrupt IN\nendpoint, the buffer is allocated from kmalloc-8 cache (exactly\n8 bytes).\n\nIf the device sends a short packet (actual_length < wMaxPacketSize),\nthe URB completes with status == 0 and the callback proceeds to read:\n\n    data[sizeof(struct usb_ctrlrequest)]\n\nwhich evaluates to data[8], accessing 1 byte beyond the allocated 8-byte\nbuffer. This results in a slab out-of-bounds read.\n\nFix this by adding the missing bounds check: first verify that the\nactual length is large enough to contain the struct usb_ctrlrequest\nheader before accessing req_pkt->bRequestType and req_pkt->bRequest,\nand then verify that there is an additional byte for the modem signal\nstate before reading data[sizeof(struct usb_ctrlrequest)] inside the\nconditional.  Use sizeof(*req_pkt) instead of sizeof(struct\nusb_ctrlrequest) for consistency.\n\n[ johan: use dev_err(); split signals declaration and initialisation ]","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/030e3a73d3c3aa67c44454649e984d6383cdb7d3","https://git.kernel.org/stable/c/060db7d48af1e650643c8b8319111a9ea2ce4486","https://git.kernel.org/stable/c/2ef5560387f2c0713cee975be2b24b281bd90f3e","https://git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec","https://git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-80827","score":0.00195,"percentile":0.09117,"date":"2026-10-26"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}