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Vulnerability record · CVE-2026-43178 · published 6 May 2026

CVE-2026-43178: Linux kernel double free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.6% CWE-415 · Double freeCWE-1341 · CWE-1341
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
15 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3 Patch
https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94d Patch
https://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2f Patch
https://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaa Patch
https://access.redhat.com/security/cve/CVE-2026-43178
https://bugzilla.redhat.com/show_bug.cgi?id=2467227
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43178.json

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Source: NIST National Vulnerability Database (record CVE-2026-43178), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.