{"id":"CVE-2026-80827","state":"PUBLISHED","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 ]","publishedAt":"2026-09-04T15:54:31.111Z","updatedAt":"2026-10-19T08:44:19.753Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"fbe60fd2abc8a5561f39719a41ad9a01b5d8e567","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"94e5525697b9e91ddc4071129874120a50a4f342","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"030e3a73d3c3aa67c44454649e984d6383cdb7d3","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"060db7d48af1e650643c8b8319111a9ea2ce4486","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"2ef5560387f2c0713cee975be2b24b281bd90f3e","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"a72a13c83a652516a0e469d275b81d29a7429049","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"d762aef4eba354066be21a5d88eb2066e282f4c9","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"885d802f544ca7bfa8f3984d94233cce715bb6b3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/serial/option.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.269","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.220","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.187","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.156","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.49","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.13","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.3","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/serial/option.c"]}],"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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80827.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80827","state":"PUBLISHED","datePublished":"2026-09-04T15:54:31.111Z","dateUpdated":"2026-10-19T08:44:19.753Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.795Z"},"containers":{"cna":{"title":"USB: serial: option: fix slab OOB read in interrupt URB callback","descriptions":[{"lang":"en","value":"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 ]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"fbe60fd2abc8a5561f39719a41ad9a01b5d8e567","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"94e5525697b9e91ddc4071129874120a50a4f342","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"030e3a73d3c3aa67c44454649e984d6383cdb7d3","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"060db7d48af1e650643c8b8319111a9ea2ce4486","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"2ef5560387f2c0713cee975be2b24b281bd90f3e","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"a72a13c83a652516a0e469d275b81d29a7429049","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"d762aef4eba354066be21a5d88eb2066e282f4c9","versionType":"git"},{"version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","status":"affected","lessThan":"885d802f544ca7bfa8f3984d94233cce715bb6b3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/serial/option.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.269","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.220","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.187","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.156","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.49","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.13","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.3","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/serial/option.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/fbe60fd2abc8a5561f39719a41ad9a01b5d8e567"},{"url":"https://git.kernel.org/stable/c/94e5525697b9e91ddc4071129874120a50a4f342"},{"url":"https://git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec"},{"url":"https://git.kernel.org/stable/c/030e3a73d3c3aa67c44454649e984d6383cdb7d3"},{"url":"https://git.kernel.org/stable/c/060db7d48af1e650643c8b8319111a9ea2ce4486"},{"url":"https://git.kernel.org/stable/c/2ef5560387f2c0713cee975be2b24b281bd90f3e"},{"url":"https://git.kernel.org/stable/c/a72a13c83a652516a0e469d275b81d29a7429049"},{"url":"https://git.kernel.org/stable/c/d762aef4eba354066be21a5d88eb2066e282f4c9"},{"url":"https://git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:44:19.753Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.10.269"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.15.220"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.187"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.156"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.108"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.18.49"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.1.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"en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