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CVE-2026-47274— pam_usb: Uncontrolled search path in pam_usb tools allows privilege escalation via PATH manipulation

CVSS 6.3 · Medium EPSS 0.02% · P6

Possible ATT&CK Techniques 1AI

T1574.002

Affected Version Matrix 1

VendorProductVersion RangeStatus
mcdopepam_usb< 0.9.0affected
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I. Basic Information for CVE-2026-47274

Vulnerability Information
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Vulnerability Title
pam_usb: Uncontrolled search path in pam_usb tools allows privilege escalation via PATH manipulation
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对搜索路径元素未加控制
Source: NVD (National Vulnerability Database)
Vulnerability Title
pam_usb 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pam_usb是McDope个人开发者的一个基于USB设备的Linux硬件认证工具。 pam_usb 0.9.0之前版本存在代码问题漏洞，该漏洞源于多个辅助工具通过PATH环境变量而非绝对路径解析外部二进制文件，可能导致攻击者在PAM认证或工具执行期间替换恶意二进制文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
mcdopepam_usb < 0.9.0 -

II. Public POCs for CVE-2026-47274

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III. Intelligence Information for CVE-2026-47274

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Patches & Fixes for CVE-2026-47274 (3)

Vendor Advisories for CVE-2026-47274 (1)

Same Patch Batch · mcdope · 2026-05-27 · 15 CVEs total

CVE-2026-447138.8 HIGHpam_usb: Command injection via $TMUX environment variable leads to RCE as root
CVE-2026-447128.2 HIGHpam_usb: Shell injection via device UUID and username in pamusb-conf and pamusb-agent
CVE-2026-480648.1 HIGHpam_usb: PAM_RHOST check skipped when deny_remote=false allows XDMCP authentication bypass
CVE-2026-447117.9 HIGHpam_usb: Symlink attacks on pad directory and pad files enable authentication bypass and r
CVE-2026-447097.8 HIGHpam_usb: PINENTRY_FALLBACK_APP environment variable allows arbitrary command execution
CVE-2026-472697.4 HIGHpam_usb: deny_remote feature incorrectly classifies IPv4-mapped IPv6 remote connections as
CVE-2026-472727.1 HIGHpam_usb: OTP pad authentication bypass via missing system pad check and uninitialized RNG
CVE-2026-480656.7 MEDIUMpam_usb: Unchecked integer multiplication before xmalloc() in conf.c allows heap-based buf
CVE-2026-472736.5 MEDIUMpam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queries
CVE-2026-472706.3 MEDIUMpam_usb: strtok() race condition in multi-threaded PAM hosts can corrupt deny_remote resul
CVE-2026-480665.7 MEDIUMpam_usb: Thread-unsafe static pointer in log.c causes data race under concurrent PAM authe
CVE-2026-472715.1 MEDIUMpam_usb: OOM guards removed by -DNDEBUG cause NULL dereference and authentication process
CVE-2026-447104.6 MEDIUMpam_usb: NULL pointer dereference from UDisks device fields causes PAM crash and login den
CVE-2026-487924.4 MEDIUMpam_usb: pusb_has_virtual_input_device() silently discards EACCES, disabling remote deskto

IV. Related Vulnerabilities

Same product: pam_usb
Same vendor: mcdope
Same weakness: CWE-427

V. Comments for CVE-2026-47274

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