CVE-2026-72301 ASoC: SOF: ipc3-control: Fix TOCTOU in bytes_put and bytes_get
A time-of-check to time-of-use race condition in the Linux kernel's SOF IPC3 control allows attackers to read or modify memory via incorrect size validation in bytes_put and bytes_get.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72301?
CVE-2026-72301 is a high-severity vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ASoC: SOF: ipc3-control: Fix TOCTOU in bytes_put and bytes_get
In sof_ipc3_bytes_put(), the size used for the memcpy is derived from the old data->size already in the buffer, not the incoming new data's size field. If the new data has a different size, the copy length is wrong: it may truncate valid data or copy stale bytes.
Similarly, sof_ipc3_bytes_get() checks data->size against max_size without accounting for the sizeof(struct sof_ipc_ctrl_data) offset of the flex array within the allocation.
Fix bytes_put to validate and use the incoming data's sof_abi_hdr.size from ucontrol before copying. Fix bytes_get to subtract sizeof(*cdata) from the bounds check to match the actual available space.
Which versions are affected by CVE-2026-72301?
How do I fix CVE-2026-72301?
Apply the vendor's patch.
Is CVE-2026-72301 being exploited?
There is no known exploitation of CVE-2026-72301 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72301, DEBIAN-CVE-2026-72301, GHSA-m237-j8mr-f2gj, UBUNTU-CVE-2026-72301.