Asking for HTML explanations of things is pretty neat, I tried it just now with the obfuscated Python POC for the new copy.fail Linux vulnerability: simonwillison.net/2026/May/8/unr
Image 1: Screenshot of a dark-themed technical document titled "What this Python script does". Body text: "This is a compact, deliberately obfuscated Linux-specific local privilege-escalation proof-of-concept. Its apparent goal is to tamper with the in-memory image/page cache of /usr/bin/su, then execute su to obtain elevated privileges." A yellow-bordered callout reads: "Safety note: This explanation is for code understanding, reverse engineering, and defensive analysis. Do not run this on systems you do not own or administer. On a vulnerable kernel, code like this can alter the behavior of a privileged executable." Left column heading "High-level summary": "The script opens /usr/bin/su read-only, decompresses an embedded binary payload, and then processes that payload in 4-byte chunks. For each chunk, it performs a carefully arranged sequence involving Linux's kernel crypto socket interface, AF_ALG, pipes, and splice(). The important point is that this is not ordinary file writing. It never c
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Thariq
@trq212
May 8
Image 2: Article cover image
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