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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | util-linux | 2.42-1 | — |
| Debian 13 | util-linux | No fix yet | — |
| Debian 12 | util-linux | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | util-linux | No fix yet | — |
| Ubuntu 26.04 LTS | util-linux | 2.41.3-3ubuntu2.2 | USN-8702-1 |
| Ubuntu 25.10 | util-linux | No fix yet | — |
| Ubuntu 24.04 LTS | util-linux | 2.39.3-9ubuntu6.6 | USN-8702-1 |
| Ubuntu 22.04 LTS | util-linux | 2.37.2-4ubuntu3.6 | USN-8702-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | util-linux +3 | 2.42-7.1.hum1 | RHSA-2026:7180 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | util-linux +1 | 2.40.4-150700.4.10.1 | SUSE-SU-2026:1406-1 |
| SLES 12 SP5 | python-libmount | 2.33.2-4.51.2 | SUSE-SU-2026:1370-1 |
| SLES 12 SP5 | util-linux +1 | 2.33.2-4.51.1 | SUSE-SU-2026:1370-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | util-linux +2 | 2.41.1-160000.3.1 | SUSE-SU-2026:21158-1 |
| SLES 16.0 | util-linux +2 | 2.41.1-160000.3.1 | SUSE-SU-2026:21158-1 |
| SLE Micro 6.2 | util-linux +1 | 2.41.1-160000.3.1 | SUSE-SU-2026:21016-1 |
| SLE Micro 6.1 | util-linux +1 | 2.40.4-slfo.1.1_4.1 | SUSE-SU-2026:20664-1 |
| SLE Micro 6.0 | util-linux +1 | 2.39.3-5.1 | SUSE-SU-2026:20714-1 |
| SLE Micro 5.5 | util-linux +1 | 2.37.4-150500.9.23.1 | SUSE-SU-2026:0856-1 |
| SLE Micro 5.4 | util-linux +1 | 2.37.2-150400.8.41.1 | SUSE-SU-2026:0982-1 |
| SLE Micro 5.3 | util-linux +1 | 2.37.2-150400.8.41.1 | SUSE-SU-2026:0982-1 |
| SLE Micro 5.2 | util-linux +1 | 2.36.2-150300.4.53.1 | SUSE-SU-2026:0987-1, SUSE-SU-2026:0857-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | util-linux | 2.41.3-4.1 | openSUSE-SU-2026:10288-1 |
| openSUSE Leap 16.0 | util-linux +2 | 2.41.1-160000.3.1 | openSUSE-SU-2026:20495-1 |
| openSUSE Leap 15.6 | python-libmount +1 | 2.39.3-150600.4.18.1 | SUSE-SU-2026:0803-1 |
| openSUSE Leap 15.6 | util-linux +1 | 2.37.4-150500.9.23.1 | SUSE-SU-2026:0856-1, SUSE-SU-2026:0803-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | util-linux | 2.40.2-4 | — |
Advisories 16
- USN-8702-1 util-linux vulnerabilities Ubuntu Security Notices (USN) · Oct 17, 2026
- RHSA-2026:7180 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- WID-SEC-2026-0507 util-linux: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Aug 31, 2026
- openSUSE-SU-2026:20495-1 Security update for util-linux SUSE / openSUSE Security Updates · Apr 22, 2026
- SUSE-SU-2026:21158-1 Security update for util-linux SUSE / openSUSE Security Updates · Apr 22, 2026
- SUSE-SU-2026:1406-1 Security update for util-linux SUSE / openSUSE Security Updates · Apr 17, 2026
- SUSE-SU-2026:1370-1 Security update for util-linux SUSE / openSUSE Security Updates · Apr 16, 2026
- SUSE-SU-2026:21016-1 Security update for util-linux SUSE / openSUSE Security Updates · Apr 14, 2026
- SUSE-SU-2026:0987-1 Security update for util-linux SUSE / openSUSE Security Updates · Mar 25, 2026
- SUSE-SU-2026:0982-1 Security update for util-linux SUSE / openSUSE Security Updates · Mar 25, 2026
- openSUSE-SU-2026:10288-1 libblkid-devel-2.41.3-4.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20714-1 Security update for util-linux SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20664-1 Security update for util-linux SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0856-1 Security update for util-linux SUSE / openSUSE Security Updates · Mar 13, 2026
- SUSE-SU-2026:0857-1 Security update for util-linux SUSE / openSUSE Security Updates · Mar 13, 2026
- SUSE-SU-2026:0803-1 Security update for util-linux SUSE / openSUSE Security Updates · Mar 5, 2026
References
- RHSA-2026:7180 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-3184 vdb-entry
- RHBZ#2442570 issue-tracking