HighFix available

ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get The ipc_control_data buffer is allocated as kzalloc(max_size), where max_size covers the entire struct sof_ipc_ctrl_data including its flexible array payload. However, the bounds checks in bytes_ext_put and _bytes_ext_get compared user data lengths against max_size directly, ignoring that cdata->data sits at an offset of sizeof(struct sof_ipc_ctrl_data) bytes into the allocation. This allowed writing up to sizeof(struct sof_ipc_ctrl_data) bytes past the end of the heap buffer from unprivileged userspace via the ALSA TLV kcontrol interface, and similarly allowed over-reading adjacent heap data on the get path. Fix all bounds checks to subtract sizeof(*cdata) from max_size so they reflect the actual space available at the cdata->data offset. Also fix the error-path restore in bytes_ext_put which wrote to cdata->data instead of cdata, causing the same overflow.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.1.184, 6.12.97, 6.18.40, 6.6.145, 7.1.5
CVEs: CVE-2026-72262
Confirmed fixed CVEs: Not specified
Updated in this feed: 2 Nov 2026, 21:21 UTC · Revision 1

Source evidence

ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get

core-osv · Original source

Published 15 Aug 2026, 05:54 UTC

osv:CVE-2026-72262

Kernel

Fixed versions: 6.1.184, 6.6.145, 6.12.97, 6.18.40, 7.1.5

Complete source record

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    "title": "ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get The ipc_control_data buffer is allocated as kzalloc(max_size), where max_size covers the entire struct sof_ipc_ctrl_data including its flexible array payload. However, the bounds checks in bytes_ext_put and _bytes_ext_get compared user data lengths against max_size directly, ignoring that cdata->data sits at an offset of sizeof(struct sof_ipc_ctrl_data) bytes into the allocation. This allowed writing up to sizeof(struct sof_ipc_ctrl_data) bytes past the end of the heap buffer from unprivileged userspace via the ALSA TLV kcontrol interface, and similarly allowed over-reading adjacent heap data on the get path. Fix all bounds checks to subtract sizeof(*cdata) from max_size so they reflect the actual space available at the cdata->data offset. Also fix the error-path restore in bytes_ext_put which wrote to cdata->data instead of cdata, causing the same overflow.",
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  "source_id": "core-osv",
  "document_id": 490222,
  "published_at": "2026-08-15T05:54:49.635+00:00"
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