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CVE-2026-47274

pam_usb: Uncontrolled search path in pam_usb tools allows privilege escalation via PATH manipulation

Published: May 27, 2026Updated: May 27, 2026 Sources: CVE List NVD
NVD MITRE
6.3CVSS
MEDIUM

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, multiple pam_usb helper tools resolved external binaries through the PATH environment variable rather than using absolute paths. An attacker who can influence the process environment during PAM authentication or tool execution could substitute malicious binaries. The affected tools are pamusb-check (src/tmux.c), pamusb-conf (tools/pamusb-conf), and pamusb-keyring-unlock-gnome (tools/pamusb-keyring-unlock-gnome). This vulnerability is fixed in 0.9.0.

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

CVSS Vector Breakdown

AV:LAC:HPR:LUI:NS:UC:HI:HA:N
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None

Weaknesses

CWE-427

Affected Products

pam_usb
mcdope

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

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

MITRE ATT&CK

1 technique
Persistence
View detailed technique mapping

References

https://github.com/mcdope/pam_usb/commit/1ee8745920388df48d001a8e61ba629071557937
github.com
https://github.com/mcdope/pam_usb/commit/52a1fd6413b7ffcc1a5b58ce432be42e7bf0dbd0
github.com
https://github.com/mcdope/pam_usb/commit/993e73d8bebb1d8e62677388de3402b6ec36b600
github.com
and 1 more references View all →

Timeline

Published
May 27, 2026
Last Updated
May 27, 2026

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