CVE-2026-31475 ASoC: sma1307: fix double free of devm_kzalloc() memory
A double free vulnerability in the Linux kernel sma1307 audio driver allows attackers to cause denial of service or potentially execute code.
- 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-2026-31475?
CVE-2026-31475 is a high-severity use after free vulnerability in Linux kernel, published on 22 Apr 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: sma1307: fix double free of devm_kzalloc() memory
A previous change added NULL checks and cleanup for allocation failures in sma1307_setting_loaded().
However, the cleanup for mode_set entries is wrong. Those entries are allocated with devm_kzalloc(), so they are device-managed resources and must not be freed with kfree(). Manually freeing them in the error path can lead to a double free when devres later releases the same memory.
Drop the manual kfree() loop and let devres handle the cleanup.
Weakness: CWE-415
Which versions are affected by CVE-2026-31475?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-31475?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-31475 being exploited?
There is no known exploitation of CVE-2026-31475 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-31475, DEBIAN-CVE-2026-31475, GHSA-9f2p-rpvq-5gc2, UBUNTU-CVE-2026-31475.