PT-2026-50783 · Mcdope · Pam Usb

Mcdope · Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-48982

Positive Technologies (AI Summary)

CVSS v3.1

5.8

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions pam usb versions prior to 0.9.2

Description This software provides hardware authentication for Linux using removable media. A race condition exists when updating a one-time pad file because a temporary file is created using the open() function without the O EXCL flag. This lack of atomicity allows two concurrent processes to open the same file, leading to the second write silently overwriting the first. Since the one-time pad is the primary replay-prevention mechanism, this divergence can cause authentication failures or create a window for pad reuse.

Recommendations Update to version 0.9.2.

Fix

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

CVE-2026-48982

Affected Products

Pam Usb

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-48982 · Security Note
• https://github.com/mcdope/pam_usb/security/advisories/GHSA-hxh6-9574-5vp6 · Note
• https://github.com/mcdope/pam_usb/releases/tag/0.9.2 · Note
• https://twitter.com/CVEnew/status/2067717386891862152 · Twitter Post
• https://twitter.com/infoflowcloud/status/2067718078436118584 · Twitter Post