CVE-2026-39314
Severity CVSS v4.0:
Pending analysis
Type:
CWE-191
Integer Underflow (Wrap or Wraparound)
Publication date:
07/04/2026
Last modified:
07/04/2026
Description
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, an integer underflow vulnerability in _ppdCreateFromIPP() (cups/ppd-cache.c) allows any unprivileged local user to crash the cupsd root process by supplying a negative job-password-supported IPP attribute. The bounds check only caps the upper bound, so a negative value passes validation, is cast to size_t (wrapping to ~2^64), and is used as the length argument to memset() on a 33-byte stack buffer. This causes an immediate SIGSEGV in the cupsd root process. Combined with systemd's Restart=on-failure, an attacker can repeat the crash for sustained denial of service.
Impact
Base Score 3.x
4.00
Severity 3.x
MEDIUM