CVE-2026-31475

Received Received - Intake

Double Free Vulnerability in Linux Kernel ASoC sma1307 Memory Management

Publication date: 2026-04-22

Last updated on: 2026-04-27

Assigner: kernel.org

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.

CVSS Scores

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Meta Information

Published

2026-04-22

Last Modified

2026-04-27

Generated

2026-07-06

AI Q&A

2026-04-22

EPSS Evaluated

2026-07-05

NVD

CVE-2026-31475

EUVD

EUVD-2026-24830

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	6.15
linux	linux_kernel	From 6.14.9 (inc) to 6.15 (exc)
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	From 6.19 (inc) to 6.19.11 (exc)
linux	linux_kernel	From 6.15.1 (inc) to 6.18.21 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-415	The product calls free() twice on the same memory address.

Attack-Flow Graph

Executive Summary

This vulnerability is a double free issue in the Linux kernel's ASoC sma1307 driver. Specifically, memory allocated with devm_kzalloc() for mode_set entries was incorrectly freed manually using kfree() in an error path. Since devm_kzalloc() allocates device-managed resources that are automatically freed later, manually freeing them causes a double free when the device resource management (devres) tries to release the same memory again.

The fix involved removing the manual kfree() calls and allowing devres to handle the cleanup properly.

Impact Analysis

A double free vulnerability can lead to undefined behavior such as memory corruption, system crashes, or potential exploitation by attackers to execute arbitrary code or escalate privileges. In this case, the improper manual freeing of device-managed memory in the Linux kernel could destabilize the system or be leveraged for malicious purposes.

Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version where the sma1307 double free issue has been fixed.

The fix involves removing manual kfree() calls for device-managed memory allocations in the sma1307 driver and relying on devres to handle cleanup properly.

Therefore, applying the official patch or upgrading to a kernel release that includes this fix is the recommended immediate step.

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