mcdope pam_usb up to 0.9.0 on Linux Removable Media src/log.c race condition

Summaryinfo

A vulnerability was found in mcdope pam_usb up to 0.9.0 on Linux. It has been declared as problematic. The affected element is an unknown function of the file src/log.c of the component Removable Media Handler. Executing a manipulation can lead to race condition. This vulnerability is handled as CVE-2026-48066. It is possible to launch the attack on the local host. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in mcdope pam_usb up to 0.9.0 on Linux. This vulnerability affects some unknown processing of the file src/log.c of the component Removable Media Handler. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-48066 since 05/20/2026. The exploitation appears to be difficult. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

Upgrading to version 0.9.1 eliminates this vulnerability.

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Productinfo

Vendor

• mcdope

Name

• pam_usb

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9.0

Website

• Product: https://github.com/mcdope/pam_usb/

CPE 2.3info

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CPE 2.2info

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