Util-linux: util-linux: access control bypass due to improper hostname canonicalization
CVE-2026-3184 is fixed in 22 products on 1 platform, first by SUSE-SU-2026:0803-1, released March 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| bsdextrautils · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | bsdextrautils 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| bsdutils · Ubuntu 26.04.1 LTS (resolute) | 1:2.41.3-3ubuntu2.2 | bsdutils 1:2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| eject · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | eject 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| fdisk · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | fdisk 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| lastlog2 · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | lastlog2 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| libblkid1 · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | libblkid1 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| libfdisk1 · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | libfdisk1 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| liblastlog2-2 · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | liblastlog2-2 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| libmount1 · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | libmount1 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| libpam-lastlog2 · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | libpam-lastlog2 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| libsmartcols1 · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | libsmartcols1 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| libuuid1 · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | libuuid1 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| login · Ubuntu 26.04.1 LTS (resolute) | 1:4.16.0-2+really2.41.3-3ubuntu2.2 | login 1:4.16.0-2+really2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| mount · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | mount 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| python-libmount · opensuse-leap 15.6 | 2.39.3-150600.4.18.1 | SUSE-SU-2026:0803-1 | Mar 4, 2026 |
| python-libmount · opensuse-leap 16.0 | 2.41.1-160000.3.1 | OPENSUSE-SU-2026:20495-1 | Apr 9, 2026 |
| python-libmount · sles 16.0 | 2.41.1-160000.3.1 | SUSE-SU-2026:21158-1 | Apr 9, 2026 |
| python3-libmount · opensuse-leap 15.6 | 2.37.4-150500.9.23.1 | SUSE-SU-2026:0856-1 | Mar 10, 2026 |
| rfkill · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | rfkill 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| util-linux · Debian 14 | 2.42-1 | DEBIAN-CVE-2026-3184 | Apr 3, 2026 |
| util-linux · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | util-linux 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| util-linux · opensuse-leap 15.6 | 2.37.4-150500.9.23.1 | SUSE-SU-2026:0856-1 | Mar 10, 2026 |
| util-linux · opensuse-leap 16.0 | 2.41.1-160000.3.1 | OPENSUSE-SU-2026:20495-1 | Apr 9, 2026 |
| util-linux · sles 15.7 | 2.40.4-150700.4.10.1 | SUSE-SU-2026:1406-1 | Apr 16, 2026 |
| util-linux · sles 16.0 | 2.41.1-160000.3.1 | SUSE-SU-2026:21158-1 | Apr 9, 2026 |
| util-linux-extra · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | util-linux-extra 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| util-linux-locales · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | util-linux-locales 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
| util-linux-systemd · opensuse-leap 15.6 | 2.39.3-150600.4.18.1 | SUSE-SU-2026:0803-1 | Mar 4, 2026 |
| util-linux-systemd · opensuse-leap 16.0 | 2.41.1-160000.3.1 | OPENSUSE-SU-2026:20495-1 | Apr 9, 2026 |
| util-linux-systemd · sles 15.7 | 2.40.4-150700.4.10.1 | SUSE-SU-2026:1406-1 | Apr 16, 2026 |
| util-linux-systemd · sles 16.0 | 2.41.1-160000.3.1 | SUSE-SU-2026:21158-1 | Apr 9, 2026 |
| uuid-runtime · Ubuntu 26.04.1 LTS (resolute) | 2.41.3-3ubuntu2.2 | uuid-runtime 2.41.3-3ubuntu2.2 | Jun 29, 2026 |
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