rsync is the Swiss Army knife of file synchronisation for Linux administrators. Unlike scp, which blindly copies every file every time, rsync computes a rolling checksum to identify changed file blocks and transfers only what has changed — making subsequent syncs dramatically faster and less bandwidth-intensive. It preserves file attributes (permissions, ownership, timestamps, ACLs, extended […]
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Rocky Linux 8 📖 ~4 min read • Source: Rocky Linux RXSA RLSA-2026:8096 Related CVEs: CVE-2025-40909 Upstream summary: Perl is a high-level programming language that is commonly used for system administration utilities and web programming. Security Fix(es): * perl: Perl threads have […]
🟡 Medium ⏱ 10–30 min Last verified: 4 November 2025 Affected versions: Debian 13 (trixie) 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2005-1141 CVE-2005-1142 CVE-2021-33479 CVE-2021-33480 CVE-2021-33481 Upstream summary: Integer overflow in the readpgm function in pnm.c for GOCR 0.40, when using the netpbm library, allows remote attackers to execute […]
🟡 Medium ⏱ 10–30 min Last verified: 4 November 2025 Affected versions: Debian 13 (trixie) 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2006-4447 CVE-2006-7236 CVE-2008-2383 CVE-2021-27135 CVE-2022-24130 CVE-2022-45063 CVE-2023-40359 Upstream summary: X.Org and XFree86, including libX11, xdm, xf86dga, xinit, xload, xtrans, and xterm, does not check the return values for […]
🟢 Low ⏱ 5–15 min Last verified: 4 November 2025 Affected versions: Debian 13 📖 ~4 min read • Source: Debian Security Tracker Related CVEs: CVE-2020-15954 Upstream summary: KDE KMail 19.12.3 (aka 5.13.3) engages in unencrypted POP3 communication during times when the UI indicates that encryption is in use. Table of contents Symptom & […]
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Rocky Linux 8 📖 ~4 min read • Source: Rocky Linux RXSA RLSA-2026:8096 Related CVEs: CVE-2025-40909 Upstream summary: Perl is a high-level programming language that is commonly used for system administration utilities and web programming. Security Fix(es): * perl: Perl threads have […]
DNS resolution on a Linux server is a multi-layered system. When an application calls getaddrinfo(“example.com”), the request passes through the Name Service Switch (NSS) framework, which consults sources in the order defined in /etc/nsswitch.conf — typically /etc/hosts first, then a DNS resolver. The DNS resolver reads its configuration from /etc/resolv.conf, which lists the DNS servers […]
🟡 Medium ⏱ 10–30 min Last verified: 4 November 2025 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read • Source: Ubuntu Security Notice USN-7544-1 Related CVEs: CVE-2025-47273 CVE-2024-6345 CVE-2022-40897 Upstream summary: It was discovered that setuptools did not properly sanitize paths. An attacker could possibly use this issue to write files to arbitrary […]
🟢 Low ⏱ 5–15 min Last verified: 4 November 2025 Affected versions: Ubuntu 24.04 (noble) 📖 ~4 min read • Source: Ubuntu Security Notice USN-7632-1 Related CVEs: CVE-2025-40908 Upstream summary: It was discovered that YAML-LibYAML incorrectly handled certain file names. An attacker could possibly use this issue to overwrite arbitrary files. Table of contents […]
While the earlier tutorial in this series covered the core useradd, usermod, and userdel tools for user lifecycle management, this guide goes deeper into the full toolkit for managing users and groups at scale on RHEL 9: bulk creation, password management with chpasswd, group administration with gpasswd, per-user resource limits with ulimit and /etc/security/limits.conf, user […]
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