CVE-2026-3184
Util-linux: util-linux: access control bypass due to improper hostname canonicalization
- State
- Published
- Severity
- 3.7 Low
- Published
- Apr 3, 2026
- Updated
- Aug 31, 2026
- Reserved
- Feb 25, 2026
Description
A flaw was found in util-linux. Improper hostname canonicalization in the `login(1)` utility, when invoked with the `-h` option, can modify the supplied remote hostname before setting `PAM_RHOST`. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based Pluggable Authentication Modules (PAM) access control rules that rely on fully qualified domain names. This could lead to unauthorized access.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N | redhat |
Weaknesses
- CWE-289 Authentication Bypass by Alternate Name
Affected Products
| Product | Versions |
|---|---|
Red Hat Hardened ImagesRed Hat |
|
Red Hat Enterprise Linux 10Red Hat | |
Red Hat Enterprise Linux 7Red Hat | |
Red Hat Enterprise Linux 8Red Hat | |
Red Hat Enterprise Linux 9Red Hat | |
Red Hat OpenShift Container Platform 4Red Hat | |
Red Hat OpenShift Container Platform 4Red Hat |
References
- RHSA-2026:7180vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-3184vdb-entry
- RHBZ#2442570issue-tracking
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