Double free in Linux kernel - CVE-2026-31468
Published: April 24, 2026
Vulnerability identifier: #VU127675
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31468
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to double free in vfio_pci_core_feature_dma_buf() when handling the dma-buf feature error path during file descriptor exhaustion. A local user can trigger file descriptor exhaustion to cause a denial of service.
The issue can result in an unbalanced reference count on the vfio device.
How to mitigate CVE-2026-31468
Install security update from vendor's repository.