CVE-2018-9275
In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25,...
In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).
- Record
CVE-2018-9275- CVSS 3.0
- 8.2 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H - CVSS 2.0
- 6.4 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:P - Weakness
- CWE-200
- Updated
- 2026-11-02
CVE List No score
In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).
- Record
CVE-2018-9275- Updated
- 2026-11-02
EUVDEUVD-2018-20869 No score
In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).
- Record
EUVD-2018-20869- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-24jw-8jpm-q7p5
In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25,...
In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).
- Record
GHSA-24jw-8jpm-q7p5- CVSS 3.0
- 8.2 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H - Weakness
- CWE-200
- Updated
- 2026-11-02
OSV
In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).
- Record
CVE-2018-9275- CVSS 3.0
- 8.2 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2018-9275
In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).
- Record
DEBIAN-CVE-2018-9275- CVSS 3.0
- 8.2 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2018-9275
In check_user_token in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).
- Record
UBUNTU-CVE-2018-9275- CVSS 3.0
- 8.2 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H - Updated
- 2026-11-02
OSVopenSUSE-SU-2024:11146-1 No score
pam_yubico-2.27-1.5 on GA media
These are all security issues fixed in the pam_yubico-2.27-1.5 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:11146-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
yubico-pamDebian:12 |
before 2.26-1 | 2.26-1 |
yubico-pamDebian:13 |
before 2.26-1 | 2.26-1 |
yubico-pamDebian:14 |
before 2.26-1 | 2.26-1 |
yubico-pamUbuntu:16.04:LTS |
All versions, plus listed versions 2.19-12.20-1 |
None known |
yubico-pamUbuntu:18.04:LTS |
All versions, plus listed versions 2.23-1 |
None known |
pam_yubicoopenSUSE:Tumbleweed |
before 2.27-1.5 | 2.27-1.5 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-9275 is a high vulnerability (CVSS 8.2) in Yubico Pam, published April 4, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.42%, the 72nd percentile. Fixed in yubico-pam 2.26-1.
References
bugzilla.opensuse.org/show_bug.cgi?id=1088027
github.com/Yubico/yubico-pam/commit/0f6ceabab0a8849b47f67d727aa526c2656089ba
nvd.nist.gov/vuln/detail/CVE-2018-9275
security-tracker.debian.org/tracker/CVE-2018-9275
ubuntu.com/security/CVE-2018-9275
cve.org/CVERecord?id=CVE-2018-9275
suse.com/security/cve/CVE-2018-9275