Description
In Yubico pam-u2f before 1.3.1, local privilege escalation can sometimes occur. This product implements a Pluggable Authentication Module (PAM) that can be deployed to support authentication using a YubiKey or other FIDO compliant authenticators on macOS or Linux. This software package has an issue that allows for an authentication bypass in some configurations. An attacker would require the ability to access the system as an unprivileged user. Depending on the configuration, the attacker may also need to know the user's password.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Yubico | pam-u2f | < 1.3.1 | 1.3.1 |
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 | pam-u2f | 1.3.1-1 | — |
| Debian 13 | pam-u2f | 1.3.1-1 | — |
| Debian 12 | pam-u2f | 1.1.0-1.1+deb12u1 | DSA-5853-1 |
| Debian 11 | pam-u2f | 1.1.0-1.1+deb11u1 | DLA-4040-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | pam-u2f | 1.1.0-1.1+deb12u1build0.24.04.1 | USN-7806-1 |
| Ubuntu 22.04 LTS | pam-u2f | 1.1.0-1.1+deb12u1build0.22.04.1 | USN-7806-1 |
| Ubuntu 18.04 LTS | pam-u2f | No fix yet | — |
| Ubuntu 16.04 LTS | pam-u2f | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | pam-u2f | 1.0.8-1ubuntu0.1~esm1 | USN-7806-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | pam_u2f | 1.2.0-150600.10.5.1 | SUSE-SU-2025:0167-1 |
| SLES 15 SP5 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SLES 15 SP4 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SLES 15 SP3 | pam_u2f | 1.0.8-150000.3.6.1 | SUSE-SU-2025:0192-1 |
| SLES 12 SP5 | pam_u2f | 1.0.8-3.6.1 | SUSE-SU-2025:0198-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SLES for SAP 15 SP4 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SLES for SAP 15 SP3 | pam_u2f | 1.0.8-150000.3.6.1 | SUSE-SU-2025:0192-1 |
| SLE Micro 6.1 | pam_u2f | 1.3.0-slfo.1.1_2.1 | SUSE-SU-2025:20231-1 |
| SLE Micro 6.0 | pam_u2f | 1.3.2-1.1 | SUSE-SU-2025:20132-1 |
| SLE Micro 5.5 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SLE Micro 5.4 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SLE Micro 5.3 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SLE HPC 15 SP5 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SLE HPC 15 SP4 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SLE HPC 15 SP3 | pam_u2f | 1.0.8-150000.3.6.1 | SUSE-SU-2025:0192-1 |
| SUSE Manager Server 4.3 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SUSE Manager Proxy 4.3 | pam_u2f | 1.2.0-150400.4.5.1 | SUSE-SU-2025:0200-1 |
| SUSE Enterprise Storage 7.1 | pam_u2f | 1.0.8-150000.3.6.1 | SUSE-SU-2025:0192-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | pam_u2f | 1.3.1-1.1 | openSUSE-SU-2025:14650-1 |
| openSUSE Leap 15.6 | pam_u2f | 1.2.0-150600.10.5.1 | SUSE-SU-2025:0167-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | pam-u2f | 1.3.1-r0 | — |
| Alpine v3.23 | pam-u2f | 1.3.1-r0 | — |
| Alpine v3.22 | pam-u2f | 1.3.1-r0 | — |
| Alpine v3.21 | pam-u2f | 1.3.2-r0 | — |
| Alpine v3.20 | pam-u2f | 1.3.2-r0 | — |
Advisories 10
- SUSE-SU-2025:20231-1 Security update for pam_u2f SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20132-1 Security update for pam_u2f SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5853-1 pam-u2f - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4040-1 pam-u2f - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-7806-1 pam-u2f vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2025:0192-1 Security update for pam_u2f SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14650-1 pam_u2f-1.3.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0167-1 Security update for pam_u2f SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0198-1 Security update for pam_u2f SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0200-1 Security update for pam_u2f SUSE / openSUSE Security Updates · Feb 4, 2026