Vulnerability · Published Apr 3, 2026 · Assigned by redhat
CVE-2026-3184Util-linux: util-linux: access control bypass due to improper hostname canonicalization
Low 3.7
In plain English
A low-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | util-linux | no fix listed | DEBIAN-CVE-2026-3184 |
| Debian:13 | util-linux | no fix listed | DEBIAN-CVE-2026-3184 |
| Debian:14 | util-linux | 2.42-1 | DEBIAN-CVE-2026-3184 |
| Ubuntu:22.04:LTS | util-linux | 2.37.2-4ubuntu3.6 | USN-8702-1 |
| Ubuntu:24.04:LTS | util-linux | 2.39.3-9ubuntu6.6 | USN-8702-1 |
| Ubuntu:25.10 | util-linux | no fix listed | UBUNTU-CVE-2026-3184 |
| Ubuntu:26.04:LTS | util-linux | 2.41.3-3ubuntu2.2 | USN-8702-1 |
| Ubuntu:26.04:LTS | util-linux | 2.41.3-3ubuntu2.2 | UBUNTU-CVE-2026-3184 |
| Ubuntu:26.10 | util-linux | no fix listed | UBUNTU-CVE-2026-3184 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Hardened Images | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
Weakness: CWE-289 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
References
- RHSA-2026:7180 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-3184 vdb-entry, x_refsource_REDHAT
- RHBZ#2442570 issue-tracking, x_refsource_REDHAT