What is CVE-2026-48066?

CVE-2026-48066 is a medium-severity vulnerability in Mcdope Pam Usb, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.7/10. Published 2026-05-27.

How severe is CVE-2026-48066?

Medium severity. CVSS v3 base score is 5.7 out of 10.

NULL pointer dereference in Mcdope Pam Usb

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.

Vulnerability class: Race Condition

Published 2026-05-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.001 (3.1th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Mcdope Pam Usb — versions < 0.9.1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-48066?: CVE-2026-48066 is a medium-severity vulnerability in Mcdope Pam Usb, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.7/10. Published 2026-05-27.
How severe is CVE-2026-48066?: Medium severity. CVSS v3 base score is 5.7 out of 10.