Util-linux: util-linux: heap buffer overread in setpwnam() when processing 256-byte usernames
Published Dec 5, 2025 · Updated Nov 3, 2026
Original summary
Normalized public record · Updated Nov 3, 2026
Util-linux: util-linux: heap buffer overread in setpwnam() when processing 256-byte usernames
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
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.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- RHSA-2026:1696 ↗
- RHSA-2026:1852 ↗
- RHSA-2026:1913 ↗
- RHSA-2026:2485 ↗
- RHSA-2026:2563 ↗
- RHSA-2026:2737 ↗
- RHSA-2026:2800 ↗
- RHSA-2026:3406 ↗
- RHSA-2026:4943 ↗
- RHSA-2026:7180 ↗
- RHSA-2026:82347 ↗
- RHSA-2026:82354 ↗
Record history
Published Dec 5, 2025 · Last refreshed Nov 3, 2026