PT-2026-44084 · Pam Usb · Pam Usb
CVSS v3.1
5.1
Medium
| Vector | AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
pam usb versions prior to 0.9.0
Description
In
src/mem.c, out-of-memory guards for the functions xmalloc(), xrealloc(), and xstrdup() were implemented using assert(data != NULL). Because assert() expressions are compiled out when NDEBUG is defined during build time—a common practice in release and packaging builds for Debian, Fedora, and Arch—these guards are removed in such versions. Consequently, these functions return NULL upon allocation failure, which is then dereferenced without a check, leading to a NULL pointer dereference and a crash of the PAM module. This creates a local denial-of-service condition where an attacker inducing memory pressure during authentication can lock all users out of sudo and login.Recommendations
Update to version 0.9.0.
Exploit
Fix
DoS
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Pam Usb