What’s Vulnerable › Vulnerabilities

CVE-2026-3184: Util-linux: util-linux: access control bypass due to improper hostname canonicalization

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-03 · updated 2026-08-31
• Weakness: CWE-289

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.

Affected products

• util-linux: all versions
• RedHat Hardened Images: all versions

References

• https://access.redhat.com/errata/RHSA-2026:7180
• https://access.redhat.com/security/cve/CVE-2026-3184
• https://bugzilla.redhat.com/show_bug.cgi?id=2442570

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