{"id":"CVE-2026-80827","revision":"04d06865ebf2474d99945fe4dbba9fff","records":[{"revision":"04d06865ebf2474d99945fe4dbba9fff","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80827","aliases":[],"title":"USB: serial: option: fix slab OOB read in interrupt URB callback","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 ]","state":0,"publishedAt":"2026-09-04T15:54:31.111+00:00","modifiedAt":"2026-10-19T08:44:19.753+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/usb/serial/option.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\n                            \"lessThan\": \"fbe60fd2abc8a5561f39719a41ad9a01b5d8e567\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\n                            \"lessThan\": \"94e5525697b9e91ddc4071129874120a50a4f342\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\n                            \"lessThan\": \"6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\n                            \"lessThan\": \"030e3a73d3c3aa67c44454649e984d6383cdb7d3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\n                            \"lessThan\": \"060db7d48af1e650643c8b8319111a9ea2ce4486\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\n                            \"lessThan\": \"2ef5560387f2c0713cee975be2b24b281bd90f3e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\n                            \"lessThan\": \"a72a13c83a652516a0e469d275b81d29a7429049\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\n                            \"lessThan\": \"d762aef4eba354066be21a5d88eb2066e282f4c9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"58cfe9113e485f7e04bd0eac4fc4251b330af501\",\n                            \"lessThan\": \"885d802f544ca7bfa8f3984d94233cce715bb6b3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/usb/serial/option.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.12\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.269\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.220\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.187\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.156\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.108\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.49\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.13\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.3\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/fbe60fd2abc8a5561f39719a41ad9a01b5d8e567","https://git.kernel.org/stable/c/94e5525697b9e91ddc4071129874120a50a4f342","https://git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec","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/a72a13c83a652516a0e469d275b81d29a7429049","https://git.kernel.org/stable/c/d762aef4eba354066be21a5d88eb2066e282f4c9","https://git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80827","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80827","identifiers":["CVE-2026-80827"]},"retained":false,"historicalAffected":[]}],"coverage":[]}