{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "58cfe9113e485f7e04bd0eac4fc4251b330af501"
            },
            {
              "fixed": "fbe60fd2abc8a5561f39719a41ad9a01b5d8e567"
            },
            {
              "fixed": "94e5525697b9e91ddc4071129874120a50a4f342"
            },
            {
              "fixed": "6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec"
            },
            {
              "fixed": "030e3a73d3c3aa67c44454649e984d6383cdb7d3"
            },
            {
              "fixed": "060db7d48af1e650643c8b8319111a9ea2ce4486"
            },
            {
              "fixed": "2ef5560387f2c0713cee975be2b24b281bd90f3e"
            },
            {
              "fixed": "a72a13c83a652516a0e469d275b81d29a7429049"
            },
            {
              "fixed": "d762aef4eba354066be21a5d88eb2066e282f4c9"
            },
            {
              "fixed": "885d802f544ca7bfa8f3984d94233cce715bb6b3"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "5.10.269"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.220"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.187"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.156"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.108"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.49"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.13"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80827.json"
  },
  "details": "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-\u003einterrupt_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 \u003c 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-\u003ebRequestType and req_pkt-\u003ebRequest,\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 ]",
  "id": "CVE-2026-80827",
  "modified": "2026-09-06T03:30:59.529931545Z",
  "published": "2026-09-04T15:54:31.111Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/030e3a73d3c3aa67c44454649e984d6383cdb7d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/060db7d48af1e650643c8b8319111a9ea2ce4486"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ef5560387f2c0713cee975be2b24b281bd90f3e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/885d802f544ca7bfa8f3984d94233cce715bb6b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94e5525697b9e91ddc4071129874120a50a4f342"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a72a13c83a652516a0e469d275b81d29a7429049"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d762aef4eba354066be21a5d88eb2066e282f4c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbe60fd2abc8a5561f39719a41ad9a01b5d8e567"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80827.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80827"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "USB: serial: option: fix slab OOB read in interrupt URB callback"
}