pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, src/tmux.c reads the user's $TMUX environment variable, splits it on commas, and interpolates the socket-path component directly into a shell command passed to popen(). Because the value is placed inside double-quotes without sanitisation, any value containing " terminates the quoted string and injects arbitrary shell syntax. popen() runs as root inside the PAM stack. This vulnerability is fixed in 0.8.7.
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Affected Vendors & Products
References
History
Sat, 30 May 2026 02:15:00 +0000
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ssvc
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Fri, 29 May 2026 16:00:00 +0000
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Mcdope
Mcdope pam Usb |
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| Vendors & Products |
Mcdope
Mcdope pam Usb |
Wed, 27 May 2026 21:00:00 +0000
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| Description | pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, src/tmux.c reads the user's $TMUX environment variable, splits it on commas, and interpolates the socket-path component directly into a shell command passed to popen(). Because the value is placed inside double-quotes without sanitisation, any value containing " terminates the quoted string and injects arbitrary shell syntax. popen() runs as root inside the PAM stack. This vulnerability is fixed in 0.8.7. | |
| Title | pam_usb: Command injection via $TMUX environment variable leads to RCE as root | |
| Weaknesses | CWE-116 CWE-78 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-05-27T20:13:13.193Z
Updated: 2026-05-30T01:48:00.396Z
Reserved: 2026-05-07T17:07:09.318Z
Link: CVE-2026-44713
Updated: 2026-05-30T01:47:56.097Z
Status : Deferred
Published: 2026-05-27T21:16:18.363
Modified: 2026-05-28T13:57:25.390
Link: CVE-2026-44713
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