SB20260507224 - Double free in Linux kernel infiniband core driver

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Main Vulnerability Database SB20260507224

SB20260507224 - Double free in Linux kernel infiniband core driver

Published: May 7, 2026

Security Bulletin ID SB20260507224
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Double free (CVE-ID: CVE-2026-43128)

CWE-ID: CWE-415 - Double Free

CVSSv4: 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


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to double free in RDMA umem dma-buf pinning logic when handling a failure in ib_umem_dmabuf_get_pinned_with_dma_device(). A local user can trigger a failure in dma-buf page mapping to cause a denial of service.

The issue occurs because the dma-buf may be unpinned on the failure path while the pinned flag remains set, leading to a second unpin during the release and revoke path.


Remediation

Install update from vendor's website.

References