pamusb provides hardware authentication for Linux using removable media.
CVE-2026-64666
pamusb provides hardware authentication for Linux using removable media. Prior to version 0.9.3, src/local.c reads XRDPSESSION with plain getenv(3) at the head of pusblocallogin while every other env consumer in the same function uses securegetenv(3). When pamusb.so loads into a setuid PAM host, the calling user controls the environment passed in. Clearing XRDPSESSION before invoking the host bypasses the explicit XRDP-deny rule. Other remote-detection signals (rmsvc, evdev, loginctl, utmp) may still catch the session, but the env-based detection alone is defeated. This issue has been patched in version 0.9.3.
Assessment
- CVSS
- 7.1 (v3.1)
- Severity
- High
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 11 November 2026
- Last updated
- 11 November 2026
- Assigner
- GitHub_M
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
At the source
References
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