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pam_usb CVE-2026-48066

| EUVD-2026-32648 MEDIUM
Race Condition (CWE-362)
2026-05-27 GitHub_M
Information Disclosure Race Condition
5.7
CVSS 3.1
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CVSS VectorNVD

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

Lifecycle Timeline

3
Patch available
May 27, 2026 - 22:04 EUVD
Analysis Generated
May 27, 2026 - 21:28 vuln.today
CVE Published
May 27, 2026 - 19:57 nvd
MEDIUM 5.7

DescriptionNVD

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.

AnalysisAI

Concurrent PAM invocations in pam_usb prior to 0.9.1 expose a process-wide static pointer race condition in src/log.c, where each PAM call overwrites a shared static pointer with the address of a stack-local variable. When multiple threads invoke the PAM stack simultaneously - a normal condition in multi-threaded Linux services such as SSH daemons or display managers - one thread's logging pointer can reference another thread's already-deallocated stack frame, causing availability loss (crash/hang) or limited integrity corruption. …

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CVE-2026-48066 vulnerability details – vuln.today
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