CVE-2026-47272

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, the pusb_pad_compare() function in src/pad.c only verified that the user-side pad (~/.pamusb/device.pad) could be read, but did not enforce that the system-side pad (the pad file on the USB device) was also present and readable. If the user-side pad was deleted or unreadable, the function returned a failure that was treated as non-fatal in certain code paths, allowing authentication to succeed without the USB device being verified. A local user can delete their own ~/.pamusb/device.pad to remove the USB device requirement and authenticate without the physical device. This vulnerability is fixed in 0.9.0.

• CWE-287
• CWE-908

• https://github.com/mcdope/pam_usb/security/advisories/GHSA-vx6f-rrqr-j87c

Published

May 27, 2026

Last Modified

Jun 17, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-47267Gogs is an open source self-hosted Git service. Prior to 0.1…8.3
• CVE-2026-47268Nezha Monitoring is a self-hostable, lightweight, servers an…6.4
• CVE-2026-47269pam_usb provides hardware authentication for Linux using ord…7.4
• CVE-2026-4727Denial-of-service in the Libraries component in NSS. This vu…7.5
• CVE-2026-47270pam_usb provides hardware authentication for Linux using ord…6.3
• CVE-2026-47271pam_usb provides hardware authentication for Linux using ord…5.1
• CVE-2026-47273pam_usb provides hardware authentication for Linux using ord…6.5
• CVE-2026-47274pam_usb provides hardware authentication for Linux using ord…6.3
• CVE-2026-47275In nanomq versions 0.24.11 and earlier, a NULL pointer deref…2.6
• CVE-2026-47276In nanomq versions 0.24.11 and earlier, a NULL pointer deref…6.5
• CVE-2026-47277Runtipi is a personal homeserver orchestrator. In versions 4…6.5
• CVE-2026-47279NocoDB is software for building databases as spreadsheets. P…6.9