SB2026050730 - Double free in Linux kernel md driver

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Main Vulnerability Database SB2026050730

SB2026050730 - Double free in Linux kernel md driver

Published: May 7, 2026

Security Bulletin ID SB2026050730
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-2026-43278)

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 request-based device-mapper targets when handling completion and teardown of cloned request bios. A local user can trigger request processing that causes the same cloned bios to be freed twice to cause a denial of service.

One observed case involves dm-multipath on top of a PCIe NVMe namespace, where the cloned bios are first freed during request completion and later freed again during clone teardown.


Remediation

Install update from vendor's website.

References