{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72262",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72262"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get\n\nThe ipc_control_data buffer is allocated as kzalloc(max_size), where\nmax_size covers the entire struct sof_ipc_ctrl_data including its\nflexible array payload. However, the bounds checks in bytes_ext_put\nand _bytes_ext_get compared user data lengths against max_size\ndirectly, ignoring that cdata->data sits at an offset of\nsizeof(struct sof_ipc_ctrl_data) bytes into the allocation.\n\nThis allowed writing up to sizeof(struct sof_ipc_ctrl_data) bytes past\nthe end of the heap buffer from unprivileged userspace via the ALSA TLV\nkcontrol interface, and similarly allowed over-reading adjacent heap\ndata on the get path.\n\nFix all bounds checks to subtract sizeof(*cdata) from max_size so they\nreflect the actual space available at the cdata->data offset. Also fix\nthe error-path restore in bytes_ext_put which wrote to cdata->data\ninstead of cdata, causing the same overflow.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.184",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72262"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af4b437a463ac0482ba705434a44da06783778e6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1adde1941bba7b0d7104b86ed819d48d81cb0ad9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eaa67e139c9217099e2a7b717aeeb46c65de3494"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/121577383b5cf221e86581e0f2bcca4c66f17469"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f4933e1d11b97b6a0951648b7c3e53850e1b33a9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fd46668d538993218eea19c6925c868ac0f2630c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires a local ioctl on /dev/snd/controlC* (SNDRV_CTL_IOCTL_TLV_WRITE/READ) through the ALSA control device; there is no network, adjacent-radio, or physical-bus attack surface for this SOF IPC3 kcontrol path.\nAC:L - On affected SOF IPC3 systems with topology bytes_ext controls, an attacker can deterministically trigger the bug by issuing TLV writes with header.length equal to max_size, causing copy_from_user/memcpy to overrun the kzalloc(max_size) buffer by sizeof(struct sof_ipc_ctrl_data).\nPR:L - The fix commit states the overflow is reachable from unprivileged userspace via ALSA TLV kcontrols; any local user who can open the sound control device (typically membership in the audio group on Linux, or an app with audio access on Android/ChromeOS) can reach the vulnerable code without real root.\nUI:N - Exploitation is performed entirely by the attacker issuing ALSA TLV ioctls against an existing bytes_ext kcontrol; no victim click, mount, or other interactive action beyond the attacker's own access to the sound control interface is required.\nS:U - The vulnerability corrupts kernel heap memory from a local userspace context and enables standard kernel privilege escalation or denial of service; it does not cross a VM, container, or IOMMU security boundary into a separate authority.\nC:H - The get path can copy_to_user up to sizeof(struct sof_ipc_ctrl_data) bytes beyond the allocated ipc_control_data buffer, leaking adjacent kernel heap contents; combined with the controllable overflow, this is an out-of-bounds read/memory corruption primitive consistent with arbitrary disclosure potential.\nI:H - The put path performs an out-of-bounds heap write of up to sizeof(struct sof_ipc_ctrl_data) bytes past the kzalloc(max_size) allocation (including via the err_restore memcpy), enabling heap metadata/object corruption that can be developed into arbitrary kernel write or code execution.\nA:H - Heap out-of-bounds writes of roughly 96 bytes into adjacent slab objects can corrupt kernel structures and trigger oops/panic or wedged audio/subsystem state; repeated TLV operations make denial of service reliably achievable even without full exploitation."
    }
  }
}