NVD

CVE-2026-43178 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

CNA: kernel.org

Base Score: 7.8 HIGH

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

ADP: redhat-SADP

Base Score: 7.0 HIGH

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-415	Double Free	NIST
CWE-1341	Multiple Releases of Same Resource or Handle	redhat-SADP

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

CVE Modified by redhat-SADP 7/14/2026 10:21:42 PM

Action

Type

Old Value

New Value

Changed

Affected

[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","defaultStatus":"unaffected","cpes":["cpe:/o:redhat:enterprise_linux:10"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","defaultStatus":"unaffected","cpes":["cpe:/o:redhat:enterprise_linux:7"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","defaultStatus":"unaffected","cpes":["cpe:/o:redhat:enterprise_linux:8"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","defaultStatus":"unaffected","cpes":["cpe:/o:redhat:enterprise_linux:9"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","defaultStatus":"unknown","cpes":["cpe:/o:redhat:enterprise_linux:6"]}]

[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"kernel","cpes":["cpe:/o:redhat:enterprise_linux:10"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","defaultStatus":"unknown","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"kernel","cpes":["cpe:/o:redhat:enterprise_linux:6"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"kernel","cpes":["cpe:/o:redhat:enterprise_linux:7"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"kernel-rt","cpes":["cpe:/o:redhat:enterprise_linux:7"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"kernel","cpes":["cpe:/o:redhat:enterprise_linux:8"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"kernel-rt","cpes":["cpe:/o:redhat:enterprise_linux:8"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"kernel","cpes":["cpe:/o:redhat:enterprise_linux:9"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"kernel-rt","cpes":["cpe:/o:redhat:enterprise_linux:9"]}]

CVE Modified by redhat-SADP 6/29/2026 11:19:45 PM

Action	Type	New Value
Added	CVSS V3.1	AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-1341
Added	Reference	https://access.redhat.com/security/cve/CVE-2026-43178
Added	Reference	https://bugzilla.redhat.com/show_bug.cgi?id=2467227
Added	Reference	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43178.json
Added	Affected	[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","defaultStatus":"unaffected","cpes":["cpe:/o:redhat:enterprise_linux:10"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","defaultStatus":"unaffected","cpes":["cpe:/o:redhat:enterprise_linux:7"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","defaultStatus":"unaffected","cpes":["cpe:/o:redhat:enterprise_linux:8"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","defaultStatus":"unaffected","cpes":["cpe:/o:redhat:enterprise_linux:9"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","defaultStatus":"unknown","cpes":["cpe:/o:redhat:enterprise_linux:6"]}]

CVE Modified by kernel.org 6/17/2026 6:49:04 AM

Action

Type

Old Value

New Value

Added

Affected

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["fs/proc/task_mmu.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"b9b97e6aeb534315f9646b2090d1a5024c6a4e82","lessThan":"f9fe092084cd04deea18747f58a2304026e76aaa","versionType":"git","status":"affected"},{"version":"cbc03ce3e6ce7e21214c3f02218213574c1a2d08","lessThan":"8adaff87db143583e08eec4f4e7788f1ef8af94d","versionType":"git","status":"affected"},{"version":"b5cbacd7f86f4f62b8813688c8e73be94e8e1951","lessThan":"90f5e87c9b75833b9ef3a4415b92c0247f28ab2f","versionType":"git","status":"affected"},{"version":"b5cbacd7f86f4f62b8813688c8e73be94e8e1951","lessThan":"61dc9f776705d6db6847c101b98fa4f0e9eb6fa3","versionType":"git","status":"affected"},{"version":"6.12.70","lessThan":"6.12.75","versionType":"semver","status":"affected"},{"version":"6.18.10","lessThan":"6.18.16","versionType":"semver","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["fs/proc/task_mmu.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"6.19","status":"affected"},{"version":"0","lessThan":"6.19","versionType":"semver","status":"unaffected"},{"version":"6.12.75","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.16","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"6.19.6","lessThanOrEqual":"6.19.*","versionType":"semver","status":"unaffected"},{"version":"7.0","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]

Initial Analysis by NIST 5/12/2026 3:52:25 PM

Action	Type	New Value
Added	CVSS V3.1	AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-415
Added	CPE Configuration	OR cpe:2.3:o:linux:linux_kernel:6.19:-::::::* cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.12.70 up to (excluding) 6.12.75 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.18.10 up to (excluding) 6.18.16 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.19.1 up to (excluding) 6.19.6
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94d Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2f Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaa Types: Patch

New CVE Received from kernel.org 5/06/2026 8:16:36 AM

Action	Type	New Value
Added	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.
Added	Reference	https://git.kernel.org/stable/c/61dc9f776705d6db6847c101b98fa4f0e9eb6fa3
Added	Reference	https://git.kernel.org/stable/c/8adaff87db143583e08eec4f4e7788f1ef8af94d
Added	Reference	https://git.kernel.org/stable/c/90f5e87c9b75833b9ef3a4415b92c0247f28ab2f
Added	Reference	https://git.kernel.org/stable/c/f9fe092084cd04deea18747f58a2304026e76aaa

Quick Info

CVE Dictionary Entry:
CVE-2026-43178
NVD Published Date:
05/06/2026
NVD Last Modified:
07/14/2026
Source:
kernel.org

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