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Vulnerabilities CVE-2026-43178

CVE-2026-43178

High
Open
TLP:CLEAR

procfs: fix possible double mmput() in do_procmap_query()

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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.

Details

CVSS Score
7.8
EPSS Score
0.13%

3.2th percentile

CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Confidence
90%
Published
May 6, 2026
Last Modified
Aug 5, 2026
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