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CVE-2026-48066— pam_usb: Thread-unsafe static pointer in log.c causes data race under concurrent PAM authentication

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.

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 0.9.1之前版本存在代码问题漏洞，该漏洞源于src/log.c包含一个进程级静态指针，每次PAM调用时写入栈局部变量地址，违反PAM重入要求并导致数据竞争。

CVSS 5.7 · Medium EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
mcdope pam_usb < 0.9.1 affected
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I. Basic Information for CVE-2026-48066

Vulnerability Information
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Vulnerability Title
pam_usb: Thread-unsafe static pointer in log.c causes data race under concurrent PAM authentication
Source: CVE Program / CVE List V5
Vulnerability Description
pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, src/log.c contains a process-wide static pointer that is written on every PAM invocation with the address of a stack-local variable. This violates the PAM re-entrancy requirement and creates a data race when the PAM stack is invoked concurrently from multiple threads. This vulnerability is fixed in 0.9.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
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 0.9.1之前版本存在代码问题漏洞，该漏洞源于src/log.c包含一个进程级静态指针，每次PAM调用时写入栈局部变量地址，违反PAM重入要求并导致数据竞争。
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 < 0.9.1 -

II. Public POCs for CVE-2026-48066

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III. Intelligence Information for CVE-2026-48066

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Patches & Fixes for CVE-2026-48066 (1)

Vendor Advisories for CVE-2026-48066 (1)

Other References for CVE-2026-48066 (1)

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

CVE-2026-44713 8.8 HIGH pam_usb: Command injection via $TMUX environment variable leads to RCE as root
CVE-2026-44712 8.2 HIGH pam_usb: Shell injection via device UUID and username in pamusb-conf and pamusb-agent
CVE-2026-48064 8.1 HIGH pam_usb: PAM_RHOST check skipped when deny_remote=false allows XDMCP authentication bypass
CVE-2026-44711 7.9 HIGH pam_usb: Symlink attacks on pad directory and pad files enable authentication bypass and r
CVE-2026-44709 7.8 HIGH pam_usb: PINENTRY_FALLBACK_APP environment variable allows arbitrary command execution
CVE-2026-47269 7.4 HIGH pam_usb: deny_remote feature incorrectly classifies IPv4-mapped IPv6 remote connections as
CVE-2026-47272 7.1 HIGH pam_usb: OTP pad authentication bypass via missing system pad check and uninitialized RNG
CVE-2026-48065 6.7 MEDIUM pam_usb: Unchecked integer multiplication before xmalloc() in conf.c allows heap-based buf
CVE-2026-47273 6.5 MEDIUM pam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queries
CVE-2026-47274 6.3 MEDIUM pam_usb: Uncontrolled search path in pam_usb tools allows privilege escalation via PATH ma
CVE-2026-47270 6.3 MEDIUM pam_usb: strtok() race condition in multi-threaded PAM hosts can corrupt deny_remote resul
CVE-2026-47271 5.1 MEDIUM pam_usb: OOM guards removed by -DNDEBUG cause NULL dereference and authentication process
CVE-2026-44710 4.6 MEDIUM pam_usb: NULL pointer dereference from UDisks device fields causes PAM crash and login den
CVE-2026-48792 4.4 MEDIUM pam_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-362

V. Comments for CVE-2026-48066

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