CVE-2026-48066— pam_usb: Thread-unsafe static pointer in log.c causes data race under concurrent PAM authentication
Possible ATT&CK Techniques 1AI
T1068 · Exploitation for Privilege EscalationGet alerts for future matching vulnerabilitiesLog in to subscribe
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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: NVD (National Vulnerability Database)
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: 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 0.9.1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
II. Public POCs 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)
- 🔗 Security audit · Issue #55 · mcdope/pam_usbx_refsource_MISC
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
- CVE-2026-44712
pam_usb: Shell injection via device UUID and username in pam - CVE-2026-44709
pam_usb: PINENTRY_FALLBACK_APP environment variable allows a - CVE-2026-44710
pam_usb: NULL pointer dereference from UDisks device fields - CVE-2026-44711
pam_usb: Symlink attacks on pad directory and pad files enab - CVE-2026-44713
pam_usb: Command injection via $TMUX environment variable le
Same vendor: mcdope
- CVE-2026-44712
pam_usb: Shell injection via device UUID and username in pam - CVE-2026-44709
pam_usb: PINENTRY_FALLBACK_APP environment variable allows a - CVE-2026-44710
pam_usb: NULL pointer dereference from UDisks device fields - CVE-2026-44711
pam_usb: Symlink attacks on pad directory and pad files enab - CVE-2026-44713
pam_usb: Command injection via $TMUX environment variable le
Same weakness: CWE-362
V. Comments for CVE-2026-48066
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