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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)
guessed Create a notification for this product.
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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          "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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      },
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        {
          "url": "https://git.kernel.org/stable/c/9c8212436631b0063cb021e9f58df438e3db84d0"
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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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          "url": "https://git.kernel.org/stable/c/91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c"
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          "url": "https://git.kernel.org/stable/c/1035a8f63bae28e498b0e7b5ac91d749844a7158"
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      "title": "ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()",
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    "dateReserved": "2026-08-26T14:34:25.796Z",
    "dateUpdated": "2026-09-04T15:54:33.981Z",
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      "cve": "CVE-2026-80829",
      "date": "2026-09-15",
      "epss": "0.00195",
      "percentile": "0.09416"
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      "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",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"sound/usb/midi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"558fc4485ecc704edfe7876d6cebae4738ff7ef8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"9c8212436631b0063cb021e9f58df438e3db84d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e9c00d7533f99aa9833c4b598f47e3b3202fdb9a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"94e4562fcc81badd1d467ddfb88c27e4fae974c2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"7f00dbddb51f4f74325cdc7c3f6b19fb3392481a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"1074c2306901b44ebcb83855583c6776e1e392ea\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"1035a8f63bae28e498b0e7b5ac91d749844a7158\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"sound/usb/midi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.269\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.220\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.187\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.156\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.108\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.49\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.13\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.3\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "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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Taxonomy of the tags.





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.