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ALSA: line6: reject oversized playback packets

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ALSA: line6: reject oversized playback packets Each playback URB is handed a slice of out.buffer that is exactly LINE6_ISO_PACKETS * max_packet_size_out bytes, sized from the OUT endpoint, but the number of bytes written into that slice is never compared against it. submit_audio_out_urb() takes the frame count from prev_fsize, which audio_in_callback() derived from the *IN* endpoint's received packet length, and rescales it with the playback frame size; when prev_fsize is still zero it synthesizes a length from the sample rate instead. On a device declaring a large IN wMaxPacketSize and a small OUT wMaxPacketSize, the resulting memcpy(), or the memset() when the playback stream is idle, runs past its slice and, as the reproducer below shows, beyond the allocation. usb_submit_urb() is not a backstop. max_packet_size_out comes from usb_maxpacket(), which returns only the low 11 bits of wMaxPacketSize, while USB core validates a high-speed isochronous length against that base scaled by usb_endpoint_maxp_mult(). A length of up to three times the allocated slice is therefore accepted, and even a rejected URB is only rejected after the write. Reject a packet that does not fit the slice the driver allocated for it. Clamping it instead would silently shorten the capture-derived rate feedback and desynchronize the two streams. BUG: KASAN: slab-out-of-bounds in submit_audio_out_urb (sound/usb/line6/playback.c:229) Writ

Announced Source revision 1
Original source ↗

CVE-2026-98836

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98836

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692",
        "lessThan": "933d8ac23388eb208ea195231d682dce0bec86ca",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692",
        "lessThan": "a84371be89c39ccc46c7af8b9eb15c448df9265f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692",
        "lessThan": "3f75da1e4ee699f6650d23d6897cf443b01856c7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692",
        "lessThan": "b78748424f29f07d310484b2b36afdececa74389",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692",
        "lessThan": "61b0a5a114fa4552892da5c0ff2f42e63bf08c6b",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "sound/usb/line6/playback.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.56",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "sound/usb/line6/playback.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98836

Source reference: /cveMetadata/cveId

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Event
#48998 · Revision 1
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