CVE-2026-3184: Kernel Util-Linux

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

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

• Kernel Util-Linux: affected versions not specified
• Red Hat Hardened Images: affected versions not specified

Published 2026-04-03. Last modified 2026-08-31.