CVE-2026-48065
Severity CVSS v4.0:
Pending analysis
Type:
CWE-122
Heap-based Buffer Overflow
Publication date:
27/05/2026
Last modified:
27/05/2026
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.
Impact
Base Score 3.x
6.70
Severity 3.x
MEDIUM