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Undocumented backdoor found in Bluetooth chip used by a billion devices
(www.bleepingcomputer.com)
this post was submitted on 08 Mar 2025
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Cybersecurity
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Couldn't they just designate them as no-op codes?
Yes, but to do that they have to be decoded and handled. That's basically what the commenter above was saying.
The original 6502 had many undocumented opcodes for this reason, and developers stated exploiting them for various reasons. The CMOS 65C02 redefined them to no-op. This has been going on a long time.