CVE-2026-90068ASoC: dapm: Fix off-by-one check on the second enum channel

Official 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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/57ab955bde747327fb2042516ae1b7192c30e881
• https://git.kernel.org/stable/c/806fa4e1f2bf73c54bc4b6360790ecc69d095ca5
• https://git.kernel.org/stable/c/496081b4edc1f6e662418831c5b14cddd8d7920c
• https://git.kernel.org/stable/c/faf539af1a595a26e5a081a4e512caee2bc2f4c5
• https://git.kernel.org/stable/c/32fc048391112559c34cb88d13594546939a4cd6
• https://git.kernel.org/stable/c/10a36512c21f861a03fba461a7ead09023df9c1b
• https://git.kernel.org/stable/c/55126ef66298e43c69f192acebae8c7cc0022cf6
• https://git.kernel.org/stable/c/14511c9b54ceeeef487409d73947c89ee8563590