CVE Catalog

CVE-2026-31468

High
Published: Translated: NVD NIST

Summary

A vulnerability related to double free in the dma-buf feature in the vfio/pci module has been identified in the Linux kernel. The error path mishandles reference counting, which may lead to file descriptor exhaustion.

Risk Assessment

Double free can lead to system instability and potential security vulnerabilities that could be exploited by attackers. In the case of file descriptor exhaustion, it may affect the operation of vfio devices.

Recommendation

It is recommended to update the Linux kernel to the latest version where this vulnerability has been fixed. Additionally, monitor the system for any irregularities in the operation of vfio devices.

Related vulnerabilities

Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Fix double free in dma-buf feature The error path through vfio_pci_core_feature_dma_buf() ignores its own advice to only use dma_buf_put() after dma_buf_export(), instead falling through the entire unwind chain. In the unlikely event that we encounter file descriptor exhaustion, this can result in an unbalanced refcount on the vfio device and double free of allocated objects. Avoid this by moving the "put" directly into the error path and return the errno rather than entering the unwind chain.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS