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CVE-2026-80829 (GCVE-0-2026-80829)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:54 – Updated: 2026-09-04 15:54
VLAI
Title
ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output() snd_usbmidi_novation_output() lays out a two-byte header at transfer_buffer[0..1] and passes &transfer_buffer[2] together with a length of ep->max_transfer - 2 to snd_rawmidi_transmit(): count = snd_rawmidi_transmit(ep->ports[0].substream, &transfer_buffer[2], ep->max_transfer - 2); ep->max_transfer comes from the output endpoint's wMaxPacketSize via usb_maxpacket(). A malformed or malicious device can advertise a bulk OUT endpoint with a wMaxPacketSize of 1 - the USB core only clamps this value downwards - so ep->max_transfer becomes 1 and the count argument becomes -1. snd_rawmidi_transmit() passes the negative count on to __snd_rawmidi_transmit_peek(), where "if (count1 > count) count1 = count" leaves count1 negative; get_aligned_size() keeps it negative for a byte-stream substream, so the following memcpy(buffer, ..., count1) runs with a (size_t)-1 length and writes far past the transfer buffer, which was allocated with usb_alloc_coherent(ep->max_transfer). This is the same class of bug that was fixed for snd_usbmidi_akai_output() in commit 0970274613fb ("ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()"); the novation output routine was left unguarded. Bail out when the endpoint cannot hold the two-byte header plus at least one payload byte.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 558fc4485ecc704edfe7876d6cebae4738ff7ef8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9c8212436631b0063cb021e9f58df438e3db84d0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e9c00d7533f99aa9833c4b598f47e3b3202fdb9a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 94e4562fcc81badd1d467ddfb88c27e4fae974c2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7f00dbddb51f4f74325cdc7c3f6b19fb3392481a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1074c2306901b44ebcb83855583c6776e1e392ea (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1035a8f63bae28e498b0e7b5ac91d749844a7158 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.269 , ≤ 5.10.* (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "value": "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\u0027s 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."
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          "url": "https://git.kernel.org/stable/c/e9c00d7533f99aa9833c4b598f47e3b3202fdb9a"
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          "url": "https://git.kernel.org/stable/c/94e4562fcc81badd1d467ddfb88c27e4fae974c2"
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          "url": "https://git.kernel.org/stable/c/7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870"
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    "dateReserved": "2026-08-26T14:34:25.796Z",
    "dateUpdated": "2026-09-04T15:54:33.981Z",
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      "date": "2026-09-18",
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      "percentile": "0.09539"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-07T01:54:55.000Z",
      "cve": "CVE-2026-80829",
      "id": "msrc_CVE-2026-80829",
      "initial_release_date": "2026-09-07T01:54:55.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80829.json",
      "version": "1"
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            "value": "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\u0027s 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",
        "lastModified": "2026-09-04T16:18:10.997",
        "metrics": {},
        "published": "2026-09-04T16:18:10.997",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1035a8f63bae28e498b0e7b5ac91d749844a7158"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1074c2306901b44ebcb83855583c6776e1e392ea"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/558fc4485ecc704edfe7876d6cebae4738ff7ef8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7f00dbddb51f4f74325cdc7c3f6b19fb3392481a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/94e4562fcc81badd1d467ddfb88c27e4fae974c2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9c8212436631b0063cb021e9f58df438e3db84d0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e9c00d7533f99aa9833c4b598f47e3b3202fdb9a"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T16:28:00Z",
      "cve": "CVE-2026-80829",
      "id": "CVE-2026-80829",
      "initial_release_date": "2026-09-05T00:26:37Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80829",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80829.json",
      "version": "5"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.