PT-2026-50784 · Mcdope · Pam Usb

Mcdope · Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-48983

Positive Technologies (AI Summary)

CVSS v3.1

5.8

Medium

Base vector

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

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

Description A symlink race condition exists in the creation of per-device and per-user pad directories. The software employs a check-then-act pattern, where it calls lstat() to verify existence and subsequently calls mkdir() to create the directory. A local attacker can exploit the timing between these calls by replacing the target path with a symlink to a directory under their control. This may result in one-time pad files being written to an attacker-controlled location, which could expose future pad values or disrupt the authentication process.

Recommendations Update to version 0.9.2.

Fix

Time Of Check To Time Of Use

Weakness Enumeration

CWE-367

Related Identifiers

CVE-2026-48983

Affected Products

Pam Usb

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-48983 · Security Note
• https://github.com/mcdope/pam_usb/security/advisories/GHSA-4j8q-67fq-3xc3 · Note
• https://github.com/mcdope/pam_usb/releases/tag/0.9.2 · Note
• https://twitter.com/CVEnew/status/2067717385478430722 · Twitter Post
• https://twitter.com/infoflowcloud/status/2067718092357034369 · Twitter Post