RHSA-2026:7180
Vulnerability from csaf_redhat - Published: 2026-04-09 01:57 - Updated: 2026-04-19 19:35Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in util-linux. This vulnerability allows a heap buffer overread when processing 256-byte usernames, specifically within the `setpwnam()` function, affecting SUID (Set User ID) login-utils utilities writing to the password database.
6.1 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:7180
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
A flaw was found in util-linux. When an /etc/fstab entry is configured with the user,loop options, the `mount` program checks the file path with user permissions but later opens it with root privileges. This creates a brief Time-of-Check-Time-of-Use (TOCTOU) window where an attacker can substitute the intended file with a malicious symbolic link. This allows a local unprivileged user to mount any root-owned file or block device that contains a valid filesystem, gaining full read access to its contents.
4.7 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:7180
Workaround
To mitigate this flaw, remove the 'user' option from any loop mounts in the /etc/fstab file or ensure the the source path points to a root-owned directory where unprivileged users do not have write permissions.
References
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"text": "A flaw was found in util-linux. This vulnerability allows a heap buffer overread when processing 256-byte usernames, specifically within the `setpwnam()` function, affecting SUID (Set User ID) login-utils utilities writing to the password database.",
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"title": "util-linux: util-linux: Heap buffer overread in setpwnam() when processing 256-byte usernames"
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"text": "A flaw was found in util-linux. When an /etc/fstab entry is configured with the user,loop options, the `mount` program checks the file path with user permissions but later opens it with root privileges. This creates a brief Time-of-Check-Time-of-Use (TOCTOU) window where an attacker can substitute the intended file with a malicious symbolic link. This allows a local unprivileged user to mount any root-owned file or block device that contains a valid filesystem, gaining full read access to its contents.",
"title": "Vulnerability description"
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"text": "util-linux: TOCTOU in the mount program when setting up loop devices",
"title": "Vulnerability summary"
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"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
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"threats": [
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"details": "Moderate"
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],
"title": "util-linux: TOCTOU in the mount program when setting up loop devices"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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