CVE-2026-72262

Quoted from the kernel CNA's own scoring file, word for word. A highlighted metric carries the most severe value CVSS v3.1 defines for it, which is what pushes the score up. source

AV:LAttack vector, local

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.

AC:LAttack complexity, low

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).

PR:LPrivileges required, low

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.

UI:NUser interaction, none

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.

S:UScope, unchanged

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.

C:HConfidentiality impact, high

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.

I:HIntegrity impact, high

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.

A:HAvailability impact, high

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.