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CVE-2026-48980— pam_usb: getenv() used in PAM context allows environment variable injection into local-check logic

Quick assessment

Affected
mcdope pam_usb
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mcdope pam_usb是mcdope的认证模块。 McDope pam_usb 0.9.2之前版本存在输入验证错误漏洞，该漏洞源于getenv()环境变量XRDP_SESSION、DISPLAY和TMUX允许环境变量注入到local-check逻辑中，可能导致本地用户通过操控进程环境，在PAM模块运行于setuid二进制程序环境下注入攻击者控制的值。

CVSS 6.3 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 1

VendorProduct Version RangeStatus
mcdope pam_usb < 0.9.2 affected
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I. Basic Information for CVE-2026-48980

Vulnerability Information
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Vulnerability Title
pam_usb: getenv() used in PAM context allows environment variable injection into local-check logic
Source: CVE Program / CVE List V5
Vulnerability Description
pam_usb provides hardware authentication for Linux using removable media. In versions prior to 0.9.2, getenv() environment variables XRDP_SESSION, DISPLAY and TMUX allow environment variable injection into local-check logic. These environment variables influence whether a current session is local or remote, and a PAM module that runs in the context of setuid binaries (sudo, su), getenv() returns attacker-controlled values whenever the process environment has been manipulated by a local user. This issue has been fixed in version 0.9.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
可信任变量或数据存储的外部初始化
Source: CVE Program / CVE List V5
Vulnerability Title
McDope pam_usb 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mcdope pam_usb是mcdope的认证模块。 McDope pam_usb 0.9.2之前版本存在输入验证错误漏洞，该漏洞源于getenv()环境变量XRDP_SESSION、DISPLAY和TMUX允许环境变量注入到local-check逻辑中，可能导致本地用户通过操控进程环境，在PAM模块运行于setuid二进制程序环境下注入攻击者控制的值。
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

Vendor Product Affected Versions CPE Subscribe
mcdope pam_usb < 0.9.2 -

II. Public POCs for CVE-2026-48980

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III. Intelligence Information for CVE-2026-48980

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Patches & Fixes for CVE-2026-48980 (1)

Vendor Advisories for CVE-2026-48980 (1)

Same Patch Batch · mcdope · 2026-06-18 · 7 CVEs total

CVE-2026-48981 6.7 MEDIUM pam_usb: xmlReadFile flags=0 permits XXE network entity fetching in conf.c
CVE-2026-48982 5.8 MEDIUM pam_usb: Missing O_EXCL on pad temp file creation allows concurrent update race
CVE-2026-48983 5.8 MEDIUM pam_usb: TOCTOU race condition in pad directory creation allows symlink substitution
CVE-2026-48985 5.5 MEDIUM pam_usb: NULL Dereference Crash in pusb_is_loginctl_local when loginctl Returns Empty Remo
CVE-2026-48984 4.7 MEDIUM pam_usb: xfree() does not call explicit_bzero — sensitive cryptographic material may linge
CVE-2026-48986 4.7 MEDIUM pam_usb: Infinite loop DoS in process-tree walk when parent process exits during authentic

IV. Related Vulnerabilities

Same product: pam_usb
Same vendor: mcdope
Same weakness: CWE-454

V. Comments for CVE-2026-48980

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