EUVD-2026-32660CVSS VectorNVD
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionNVD
pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, src/device.c passed the return values of udisks_drive_get_serial(), udisks_drive_get_vendor(), and udisks_drive_get_model() directly to strcmp() without NULL checks. The GIO/UDisks API documentation states these accessors can return NULL for devices that do not expose the corresponding field. Passing NULL to strcmp() is undefined behaviour (typically a SIGSEGV). This vulnerability is fixed in 0.8.7.
AnalysisAI
NULL pointer dereference in pam_usb prior to 0.8.7 allows a physically present attacker to crash the PAM authentication stack by inserting a USB device whose serial, vendor, or model metadata fields are absent. The module in src/device.c passes return values from udisks_drive_get_serial(), udisks_drive_get_vendor(), and udisks_drive_get_model() directly to strcmp() without NULL checks, despite the GIO/UDisks2 API explicitly documenting that these accessors can return NULL for devices not exposing those fields. …
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