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CVE-2026-47274
pam_usb: Uncontrolled search path in pam_usb tools allows privilege escalation via PATH manipulation
Medium6.3EPSS 0.14%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, multiple pam_usb helper tools resolved external binaries through the PATH environment variable rather than using absolute paths. An attacker who can influence the process environment during PAM authentication or tool execution could substitute malicious binaries. The affected tools are pamusb-check (src/tmux.c), pamusb-conf (tools/pamusb-conf), and pamusb-keyring-unlock-gnome (tools/pamusb-keyring-unlock-gnome). This vulnerability is fixed in 0.9.0.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium6.3 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Deferred | 3.1 | Medium6.3 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.
Weakness
Affected products
References (4)
- https://github.com/mcdope/pam_usb/security/advisories/GHSA-pp29-w28g-r9h9 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/mcdope/pam_usb/commit/1ee8745920388df48d001a8e61ba629071557937 (opens in a new tab)x_refsource_MISC
- https://github.com/mcdope/pam_usb/commit/52a1fd6413b7ffcc1a5b58ce432be42e7bf0dbd0 (opens in a new tab)x_refsource_MISC
- https://github.com/mcdope/pam_usb/commit/993e73d8bebb1d8e62677388de3402b6ec36b600 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2026-47274)Record last updated .