CVE-2026-72304 (GCVE-0-2026-72304)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42
VLAI
Title
ASoC: SOF: ipc4-control: Fix TOCTOU in sof_ipc4_bytes_put
Summary
In the Linux kernel, the following vulnerability has been resolved: ASoC: SOF: ipc4-control: Fix TOCTOU in sof_ipc4_bytes_put In sof_ipc4_bytes_put(), the copy size is derived from the old data->size in the buffer rather than the incoming new data's size field from ucontrol. If the new data has a different size, the copy uses the wrong length: it may truncate valid data or copy stale bytes. Fix by validating and using the incoming data's sof_abi_hdr.size from ucontrol before copying.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a062c8899fede2ab5660a817e9b602d3fa280a99 , < 266f936db83aee6ca6473bbb06259bda52bf4fc3 (git)
Affected: a062c8899fede2ab5660a817e9b602d3fa280a99 , < 4cf6a7ebbf8787393b158b2cc341723e5bebc4a8 (git)
Affected: a062c8899fede2ab5660a817e9b602d3fa280a99 , < fb4293173db2d474d8fbc0e5ecf4943e6df2b40e (git)
Affected: a062c8899fede2ab5660a817e9b602d3fa280a99 , < 038406abde0d0883419ec89425ea941ec8bbef95 (git)
Affected: a062c8899fede2ab5660a817e9b602d3fa280a99 , < 3ad673e7139cf214afd24321a829aad6575f4163 (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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        {
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          "product": "Linux",
          "programFiles": [
            "sound/soc/sof/ipc4-control.c"
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              "value": "AV:L - The bug is reached via SNDRV_CTL_IOCTL_ELEM_WRITE on /dev/snd/controlC* through snd_ctl_elem_write_user() -\u003e snd_sof_bytes_put() -\u003e sof_ipc4_bytes_put(); SOF IPC4 bytes controls are a local ALSA ioctl path, not a network-facing service.\nAC:L - An attacker reliably triggers the flaw with two self-controlled ALSA writes: first establish a small cached data-\u003esize, then submit a ucontrol whose sof_abi_hdr.size differs; no race against unrelated victim state is required.\nPR:L - Only a local user who can open ALSA control devices on SOF-equipped Intel laptop/desktop audio hardware is required; typical desktop users in the audio group have this access without real root or init-namespace capabilities.\nUI:N - No separate victim action is needed; the attacker issues the control-element write ioctls directly to drive the vulnerable copy and subsequent IPC transmission.\nS:U - Impact is confined to the host kernel SOF/ALSA audio subsystem on the same machine; heap disclosure, IPC misuse, or firmware parameter corruption does not cross VM, container, or IOMMU boundaries.\nC:H - Validating and copying against stale data-\u003esize lets attacker-controlled new_hdr-\u003esize bypass bounds checks, so sof_ipc4_set_get_bytes_data() and IPC helpers read beyond the kmalloc control buffer, disclosing adjacent kernel heap memory.\nI:H - The mismatched copy leaves attacker-influenced stale kernel bytes in control buffers and forwards unvalidated sizes to firmware IPC (including sof_ipc4_set_bytes_control_data() memcpy paths), enabling bounded but attacker-directed kernel memory corruption.\nA:H - Inflated unvalidated data-\u003esize values drive large memcpy/IPC loops past the allocated control payload, which can provoke KASAN faults, unhandled page faults, kernel oops, or panic on SOF systems."
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/3ad673e7139cf214afd24321a829aad6575f4163"
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    "datePublished": "2026-08-15T05:55:22.290Z",
    "dateReserved": "2026-08-09T03:40:39.918Z",
    "dateUpdated": "2026-08-17T05:42:37.543Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T21:43:22+00:00",
      "cve": "CVE-2026-72304",
      "id": "CVE-2026-72304",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ASoC: SOF: ipc4-control: Fix TOCTOU in sof_ipc4_bytes_put",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72304.json",
      "version": "3"
    }
  }
}



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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

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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.