CVE-2026-48065— pam_usb: Unchecked integer multiplication before xmalloc() in conf.c allows heap-based buffer overflow on 32-bit targets
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationGet alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-48065
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
pam_usb: Unchecked integer multiplication before xmalloc() in conf.c allows heap-based buffer overflow on 32-bit targets
Source: NVD (National Vulnerability Database)
Vulnerability Description
pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.1, src/conf.c allocates heap memory proportional to n_devices, a count derived from libxml2 XPath evaluation of the config file, without first enforcing an upper bound. On 32-bit targets (armv7l, i686 -- both listed in the project Makefile), the multiplication n_devices * sizeof(t_pusb_device) wraps around size_t, causing xmalloc() to receive a very small size. Because xmalloc() only calls abort() on NULL return, a small-but-non-NULL allocation is accepted, and subsequent array writes overflow the heap. This vulnerability is fixed in 0.9.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
堆缓冲区溢出
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-48065
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-48065
请登录查看更多情报信息。
Vendor Advisories for CVE-2026-48065 (1)
Proof of Concept for CVE-2026-48065 (1)
Other References for CVE-2026-48065 (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-2026-47273 | 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-2026-48066 | 5.7 MEDIUM | pam_usb: Thread-unsafe static pointer in log.c causes data race under concurrent PAM authe |
| 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-122
- CVE-2026-4391
TeamSpeak 3 Server ECC Key heap-based overflow - CVE-2026-8175
Multiple vulnerabilities in Aspera applications. - CVE-2026-9605
GNU libredwg Dwgbmp Utility bits.c bit_read_RC heap-based ov - CVE-2026-44983
smallbitvec: Safe API Triggered Heap Buffer Overflow via Int - CVE-2026-8834
IBM HTTP Server is affected by multiple vulnerabilities
V. Comments for CVE-2026-48065
No comments yet