CVE-2026-63838 ASoC: rsnd: Fix potential out-of-bounds access of component_dais[]
A local attacker can trigger an out-of-bounds memory access in the Linux kernel's Renesas sound driver, potentially causing a crash or arbitrary code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63838?
CVE-2026-63838 is a memory corruption vulnerability in Linux, published on 19 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: rsnd: Fix potential out-of-bounds access of component_dais[]
component_dais[RSND_MAX_COMPONENT] is initially zero-initialized and later populated in rsnd_dai_of_node(). However, the existing boundary check: if (i >= RSND_MAX_COMPONENT)
does not guarantee that the last valid element remains zero. As a result, the loop can rely on component_dais[RSND_MAX_COMPONENT] being zero, which may lead to an out-of-bounds access.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Which versions are affected by CVE-2026-63838?
How do I fix CVE-2026-63838?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-63838 being exploited?
There is no known exploitation of CVE-2026-63838 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-63838, DEBIAN-CVE-2026-63838, GHSA-vfg9-hvpm-5mgj, UBUNTU-CVE-2026-63838.