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CVE-2026-48066

pam_usb: Thread-unsafe static pointer in log.c causes data race under concurrent PAM authentication

Published: May 27, 2026Updated: May 27, 2026 Sources: CVE List NVD
NVD MITRE
5.7CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:LAC:HPR:NUI:NS:UC:NI:LA:H
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:HAvailability
High

Weaknesses

CWE-362CWE-476

Affected Products

pam_usb
mcdope

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

3 techniques
Impact
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/mcdope/pam_usb/issues/350
github.com
https://github.com/mcdope/pam_usb/issues/55
github.com
https://github.com/mcdope/pam_usb/security/advisories/GHSA-qg76-57wq-mpv6
github.com

Timeline

Published
May 27, 2026
Last Updated
May 27, 2026

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