buffer sizing

About this tag
Buffer sizing is a recurring theme in system-level programming and security, as demonstrated by the Linux kernel vulnerability CVE-2026-31630. This flaw in the AF_RXRPC procfs code used fixed 50-byte stack buffers for socket addresses, but an IPv6 address with port can require 51 bytes including the terminating NUL, leading to an off-by-one error. The issue highlights that even diagnostic paths rarely touched by users can harbor buffer sizing mistakes. While the NVD published the record in April 2026, a CVSS score was not immediately assigned, leaving administrators to assess urgency from kernel commits and distribution advisories. The lesson is that careful buffer sizing remains critical for security and stability.

  1. CVE-2026-31630: Linux Kernel Procfs Off-By-One Fix and Buffer Sizing Lesson

    CVE-2026-31630 is a small-looking Linux kernel fix with a larger lesson: buffer sizing still matters, even in diagnostic paths that most users never touch. The flaw sits in the AF_RXRPC procfs code, where socket addresses were formatted into fixed 50-byte stack buffers even though a current...
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