{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "558fc4485ecc704edfe7876d6cebae4738ff7ef8"
            },
            {
              "fixed": "9c8212436631b0063cb021e9f58df438e3db84d0"
            },
            {
              "fixed": "e9c00d7533f99aa9833c4b598f47e3b3202fdb9a"
            },
            {
              "fixed": "94e4562fcc81badd1d467ddfb88c27e4fae974c2"
            },
            {
              "fixed": "7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870"
            },
            {
              "fixed": "91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c"
            },
            {
              "fixed": "7f00dbddb51f4f74325cdc7c3f6b19fb3392481a"
            },
            {
              "fixed": "1074c2306901b44ebcb83855583c6776e1e392ea"
            },
            {
              "fixed": "1035a8f63bae28e498b0e7b5ac91d749844a7158"
            }
          ],
          "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-2026-80829.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()\n\nsnd_usbmidi_novation_output() lays out a two-byte header at\ntransfer_buffer[0..1] and passes \u0026transfer_buffer[2] together with a\nlength of ep-\u003emax_transfer - 2 to snd_rawmidi_transmit():\n\n\tcount = snd_rawmidi_transmit(ep-\u003eports[0].substream,\n\t\t\t\t     \u0026transfer_buffer[2],\n\t\t\t\t     ep-\u003emax_transfer - 2);\n\nep-\u003emax_transfer comes from the output endpoint's wMaxPacketSize via\nusb_maxpacket(). A malformed or malicious device can advertise a bulk\nOUT endpoint with a wMaxPacketSize of 1 - the USB core only clamps this\nvalue downwards - so ep-\u003emax_transfer becomes 1 and the count argument\nbecomes -1.\n\nsnd_rawmidi_transmit() passes the negative count on to\n__snd_rawmidi_transmit_peek(), where \"if (count1 \u003e count) count1 = count\"\nleaves count1 negative; get_aligned_size() keeps it negative for a\nbyte-stream substream, so the following memcpy(buffer, ..., count1) runs\nwith a (size_t)-1 length and writes far past the transfer buffer, which\nwas allocated with usb_alloc_coherent(ep-\u003emax_transfer).\n\nThis is the same class of bug that was fixed for snd_usbmidi_akai_output()\nin commit 0970274613fb (\"ALSA: usb-audio: fix OOB write in\nsnd_usbmidi_akai_output()\"); the novation output routine was left\nunguarded. Bail out when the endpoint cannot hold the two-byte header\nplus at least one payload byte.",
  "id": "CVE-2026-80829",
  "modified": "2026-09-06T03:30:14.827314297Z",
  "published": "2026-09-04T15:54:33.981Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1035a8f63bae28e498b0e7b5ac91d749844a7158"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1074c2306901b44ebcb83855583c6776e1e392ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/558fc4485ecc704edfe7876d6cebae4738ff7ef8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f00dbddb51f4f74325cdc7c3f6b19fb3392481a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94e4562fcc81badd1d467ddfb88c27e4fae974c2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c8212436631b0063cb021e9f58df438e3db84d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e9c00d7533f99aa9833c4b598f47e3b3202fdb9a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80829.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80829"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()"
}