CVE-2026-90068

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

ASoC: dapm: Fix off-by-one check on the second enum channel

The snd_soc_dapm_put_enum_double() rejects item[0] once it reaches

e->items, but it lets item[1] be equal to it. Both go on to

snd_soc_enum_item_to_val(), which indexes e->values with no bound of

its own, so an enum with a value table reads one element past the end.

The indexing arrived with the MUX consolidation, which relaxed the

item[1] check in the same hunk. The value MUX handler it deleted used

>= there, and the snd_soc_put_enum_double() in soc-ops.c still does.

Only adav80x pairs a value table with two shifts, and its second

channel looks accidental, but the control does report two values.

Writing three into it reads off the end of adav80x_mux_values. The

core catches that only under CONFIG_SND_CTL_INPUT_VALIDATION, which

defaults off.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References