{"api_version":"1","generated_at":"2026-09-11T15:42:21+00:00","cve":"CVE-2026-80827","urls":{"html":"https://cve.report/CVE-2026-80827","api":"https://cve.report/api/cve/CVE-2026-80827.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80827","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80827"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-04 16:18:10","updated_at":"2026-09-04 16:18:10"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/d762aef4eba354066be21a5d88eb2066e282f4c9","name":"https://git.kernel.org/stable/c/d762aef4eba354066be21a5d88eb2066e282f4c9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3","name":"https://git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a72a13c83a652516a0e469d275b81d29a7429049","name":"https://git.kernel.org/stable/c/a72a13c83a652516a0e469d275b81d29a7429049","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/94e5525697b9e91ddc4071129874120a50a4f342","name":"https://git.kernel.org/stable/c/94e5525697b9e91ddc4071129874120a50a4f342","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fbe60fd2abc8a5561f39719a41ad9a01b5d8e567","name":"https://git.kernel.org/stable/c/fbe60fd2abc8a5561f39719a41ad9a01b5d8e567","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec","name":"https://git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/060db7d48af1e650643c8b8319111a9ea2ce4486","name":"https://git.kernel.org/stable/c/060db7d48af1e650643c8b8319111a9ea2ce4486","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2ef5560387f2c0713cee975be2b24b281bd90f3e","name":"https://git.kernel.org/stable/c/2ef5560387f2c0713cee975be2b24b281bd90f3e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/030e3a73d3c3aa67c44454649e984d6383cdb7d3","name":"https://git.kernel.org/stable/c/030e3a73d3c3aa67c44454649e984d6383cdb7d3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80827","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80827","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 fbe60fd2abc8a5561f39719a41ad9a01b5d8e567 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 94e5525697b9e91ddc4071129874120a50a4f342 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 58cfe9113e485f7e04bd0eac4fc4251b330af501 030e3a73d3c3aa67c44454649e984d6383cdb7d3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.269 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.220 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.187 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.156 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.108 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.49 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.13 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.3 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80827","cve":"CVE-2026-80827","epss":"0.001950000","percentile":"0.092800000","score_date":"2026-09-07","updated_at":"2026-09-08 00:05:27"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/usb/serial/option.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"fbe60fd2abc8a5561f39719a41ad9a01b5d8e567","status":"affected","version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","versionType":"git"},{"lessThan":"94e5525697b9e91ddc4071129874120a50a4f342","status":"affected","version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","versionType":"git"},{"lessThan":"6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec","status":"affected","version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","versionType":"git"},{"lessThan":"030e3a73d3c3aa67c44454649e984d6383cdb7d3","status":"affected","version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","versionType":"git"},{"lessThan":"060db7d48af1e650643c8b8319111a9ea2ce4486","status":"affected","version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","versionType":"git"},{"lessThan":"2ef5560387f2c0713cee975be2b24b281bd90f3e","status":"affected","version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","versionType":"git"},{"lessThan":"a72a13c83a652516a0e469d275b81d29a7429049","status":"affected","version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","versionType":"git"},{"lessThan":"d762aef4eba354066be21a5d88eb2066e282f4c9","status":"affected","version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","versionType":"git"},{"lessThan":"885d802f544ca7bfa8f3984d94233cce715bb6b3","status":"affected","version":"58cfe9113e485f7e04bd0eac4fc4251b330af501","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/usb/serial/option.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.12"},{"lessThan":"2.6.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.269","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.220","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.187","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.156","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.108","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.49","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.13","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.3","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.269","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.220","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.187","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.156","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.108","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.49","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.13","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.3","versionStartIncluding":"2.6.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"2.6.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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 ]"}],"providerMetadata":{"dateUpdated":"2026-09-04T15:54:31.111Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"USB: serial: option: fix slab OOB read in interrupt URB callback","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80827","datePublished":"2026-09-04T15:54:31.111Z","dateReserved":"2026-08-26T14:34:25.795Z","dateUpdated":"2026-09-04T15:54:31.111Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-04 16:18:10","lastModifiedDate":"2026-09-04 16:18:10","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80827","Ordinal":"1","Title":"USB: serial: option: fix slab OOB read in interrupt URB callback","CVE":"CVE-2026-80827","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80827","Ordinal":"1","NoteData":"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 ]","Type":"Description","Title":"USB: serial: option: fix slab OOB read in interrupt URB callback"}]}}}