Your Ubuntu Server Has 3 Newer Kernels Installed That It Is Not Running: Check What the Next Reboot Boots Four kernels installed, the newest is not running, and the reboot flag file is missing. Three checks and one GRUB setting that show what an Ubuntu reboot will boot, with real output. Oct 22, 2026 7 min read Linux
CVE-2026-31431 Copy Fail: An Ubuntu Kernel Flaw That Grants Root From Any Local Account A 9-year-old logic bug in the Linux kernel crypto API grants reliable root privilege escalation to any local account. Checking your fix requires more than comparing raw version numbers. Oct 12, 2026 5 min read Linux
