CVE-2026-48066
pam_usb: Thread-unsafe static pointer in log.c causes data race under concurrent PAM authentication
CVSS Score
5.7
EPSS Score
0.0%
EPSS Percentile
4th
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.
| CWE | CWE-362 CWE-476 |
| Vendor | mcdope |
| Product | pam_usb |
| Published | May 27, 2026 |
| Last Updated | May 28, 2026 |
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CVSS v3 Breakdown
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
Affected Versions
mcdope / pam_usb
< 0.9.1