CVE-2026-48066

Description

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.

CVSS v3.1 Score

5.7

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

Weakness Type (CWE)

CWE-362 CWE-362

CWE-476 CWE-476

References

Other References

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

Frequently Asked Questions

What is CVE-2026-48066? +

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. It has a CVSS v3.1 base score of 5.7 (MEDIUM).

How severe is CVE-2026-48066? +

CVE-2026-48066 has a CVSS v3.1 score of 5.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2026-48066? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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