Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-31468

Severity CVSS v4.0:
Pending analysis
Type:
CWE-415 Double Free
Publication date:
22/04/2026
Last modified:
07/05/2026

Description

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

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.80
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.19 (including) 6.19.11 (excluding)
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools