CVE-2026-35357

Description

The cp utility in uutils coreutils is vulnerable to an information disclosure race condition. Destination files are initially created with umask-derived permissions (e.g., 0644) before being restricted to their final mode (e.g., 0600) later in the process. A local attacker can race to open the file during this window; once obtained, the file descriptor remains valid and readable even after the permissions are tightened, exposing sensitive or private file contents.

Weakness classification

• security@ubuntu.com: CWE-367

Primary references

• security@ubuntu.com — Exploit, Issue Tracking, Vendor Advisory
• 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Issue Tracking, Vendor Advisory