BusyBox passwd/group tokenize() references a stale endpoint pointer after trimming, causing an out-of-bounds write of heap pointers.

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Fixes

Solution

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Workaround

Ensure /etc/group and /etc/passwd are writable only by root and protected by mandatory access controls. Monitor these files for unauthorized modifications. Upstream should fix tokenize() to recompute tokenize_end after trimming.

History

Wed, 23 Sep 2026 18:00:00 +0000

Type Values Removed Values Added
Description BusyBox passwd/group tokenize() references a stale endpoint pointer after trimming, causing an out-of-bounds write of heap pointers.
Title Busybox: busybox: passwd/group parser writes heap pointers out of bounds due to stale tokenize() endpoint
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-787
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 6.7, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-23T19:44:12.718Z

Reserved: 2026-09-10T09:42:04.559Z

Link: CVE-2026-88839

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-23T18:17:10.640

Modified: 2026-09-23T19:40:10.000

Link: CVE-2026-88839

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses