CVE-2026-64243 ASoC: codecs: simple-mux: Fix enum control bounds check
An integer overflow in the Linux kernel's simple-mux codec allows invalid enum values, potentially leading to out-of-bounds reads and code execution.
- 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-2026-64243?
CVE-2026-64243 is a high-severity vulnerability in Linux kernel, published on 24 Jul 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: 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.
Which versions are affected by CVE-2026-64243?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64243?
Apply the vendor's patch.
Is CVE-2026-64243 being exploited?
There is no known exploitation of CVE-2026-64243 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64243, DEBIAN-CVE-2026-64243, GHSA-g8x3-7685-9cvh, ROOT-OS-UBUNTU-2204-CVE-2026-64243, UBUNTU-CVE-2026-64243.