QwikSec

Security Database

CVE

CWE

Training

CVE-2026-48066

Published: May 27, 2026

Modified: May 28, 2026

PUBLISHED

CVSS v3.1

5.7

MEDIUM

Description

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, src/log.c contains a process-wide static pointer that is written on every PAM invocation with the address of a stack-local variable. This violates the PAM re-entrancy requirement and creates a data race when the PAM stack is invoked concurrently from multiple threads. This vulnerability is fixed in 0.9.1.

Vendor	Product	Versions
mcdope	pam_usb	affected `< 0.9.1`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

References

https://github.com/mcdope/pam_usb/security/advisories/GHSA-qg76-57wq-mpv6

x_refsource_CONFIRM

https://github.com/mcdope/pam_usb/issues/350

x_refsource_MISC

https://github.com/mcdope/pam_usb/issues/55

x_refsource_MISC

Security Training

Train your team to recognize and prevent security threats with our comprehensive security awareness program.

Vulnerability Scanning

Discover vulnerabilities in your applications and infrastructure before attackers do.