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Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Ext4 file system; - Network file system (NFS) server …

https://security-tracker.debian.org/tracker/DSA-6037-1

Damien Tournoud, Patrick Dawkins, Vince Parker, and Jules Duvivier discovered that Go Cryptography incorrectly handled public keys during SSH operations. An attacker could possibly use this issue to bypass authorization mechanisms.

It was discovered that the fetchmail SMTP client incorrectly handled certain status code messages. An attacker controlling a malicious server could possibly use this issue to cause fetchmail to crash, resulting in a denial of service.