Denial of Remote Session Validation in pam_usb for Linux by MCDope
CVE-2026-47270

6.3MEDIUM

Key Information:

Vendor

Mcdope

Status
Pam Usb
Vendor
CVE Published:
27 May 2026

What is CVE-2026-47270?

The pam_usb module, which facilitates hardware authentication in Linux, contains a vulnerability that can lead to incorrect parsing of authentication requests due to a race condition in its multi-threaded environment. Prior to version 0.9.0, concurrent authentication attempts can overwrite each other's state, affecting the deny_remote feature. This may result in improper decisions regarding remote and local session authentications, potentially allowing unauthorized access. The issue has been rectified in version 0.9.0.

Affected Version(s)

pam_usb < 0.9.0

References

https://github.com/mcdope/pam_usb/security/advisories/GHS...
x_refsource_CONFIRM
https://github.com/mcdope/pam_usb/commit/94f1640a61d49dfa...
x_refsource_MISC
https://github.com/mcdope/pam_usb/commit/d003e551b794a9e3...
x_refsource_MISC

CVSS V3.1

Score:
6.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.