Kernel
Linux kernel and low-level system topics relevant to running Magento servers: tuning, networking and OS-level performance.
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https://www.samdjames.uk/blog/copy-fail-cve-2026-31431/
Explains the AF_ALG kernel bug that allows any local user to escalate to root. Provides an emergency mitigation (disable algif_aead with an Ansible snippet) and advises updating to patched kernels.