CVE-2026-43178

Severity CVSS v4.0:

Pending analysis

Type:

CWE-415 Double Free

Publication date:

06/05/2026

Last modified:

12/05/2026

Description

In the Linux kernel, the following vulnerability has been resolved: procfs: fix possible double mmput() in do_procmap_query() When user provides incorrectly sized buffer for build ID for PROCMAP_QUERY we return with -ENAMETOOLONG error. After recent changes this condition happens later, after we unlocked mmap_lock/per-VMA lock and did mmput(), so original goto out is now wrong and will double-mmput() mm_struct. Fix by jumping further to clean up only vm_file and name_buf.

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::::::::	6.12.70 (including)	6.12.75 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.18.10 (including)	6.18.16 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.19.1 (including)	6.19.6 (excluding)
cpe:2.3:o:linux:linux_kernel:6.19:-::::::

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

CVE-2026-43178

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools