Improper Hostname Canonicalization in util-linux Affects Access Control
CVE-2026-3184

3.7LOW

Key Information:

Vendor

Red Hat
Status
Red Hat Hardened Images
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
3 April 2026

What is CVE-2026-3184?

A vulnerability exists in the util-linux package where improper hostname canonicalization in the login(1) utility, when using the -h option, can lead to modification of the specified remote hostname. This misconfiguration may enable a remote attacker to provide a crafted hostname that can circumvent host-based Pluggable Authentication Modules (PAM) access controls dependent on fully qualified domain names. Such exploitation raises the risk of unauthorized system access, posing a serious security threat to affected systems.

Affected Version(s)

Red Hat Hardened Images 2.42-7.1.hum1

References

https://access.redhat.com/errata/RHSA-2026:7180
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-3184
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2442570
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
3.7
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.