CVE-2025-6297dpkg-deb: Fix cleanup for control member with restricted directories

Descripción

It was discovered that dpkg-deb does not properly sanitize directory permissions when extracting a control member into a temporary directory, which is documented as being a safe operation even on untrusted data. This may result in leaving temporary files behind on cleanup. Given automated and repeated execution of dpkg-deb commands on adversarial .deb packages or with well compressible files, placed inside a directory with permissions not allowing removal by a non-root user, this can end up in a DoS scenario due to causing disk quota exhaustion or disk full conditions.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://git.dpkg.org/cgit/dpkg/dpkg.git/commit/?id=ed6bbd445dd8800308c67236ba35d08004c98e82 Patch
• https://lists.debian.org/debian-lts-announce/2026/07/msg00015.html