TL;DR: AMD disclosed a critical vulnerability, AMD-SB-7055, affecting the RDSEED hardware random number generator on Zen 5 CPUs, causing 16-bit and 32-bit RDSEED instructions to return all zeroes while signaling success. This flaw risks cryptographic key predictability, with microcode fixes planned by January 2026. AMD has detailed in a new security bulletin a critical CPU vulnerability that has been labeled " AMD-SB-7055, " and can be traced to the RDSEED hardware-based random number generator. 2 VIEW GALLERY - 2 IMAGES Modern CPUs include hardware instructions such as RDRAND and RDSEED to generate random numbers directly from silicon. These random numbers are then utilized by software and the operating system for cryptographic functions such as generating encryption keys, tokens, or secure session IDs. Popular Now: Western Digital runs out of HDD capacity: CEO says massive AI deals secured, price surges ahead For example, RDRAND produces pseudo-random numbers that are from an entropy pool, while RDSEED produces raw entropy, otherwise known as the " seed ", which is then used to construct cryptographically secure random number generators. Read more : AMD confirms security vulnerability in every Zen 1 to Zen 5 processor Cryptography relies on unpredictability, meaning RDSEED needs to return a truly random value every time, and if it doesn't, that opens the door for critical security vulnerabilities, as cryptographic keys that are used for encryption, authentication, or signing could then be predictable or even reconstructible. Furthermore, attacks could even decrypt sensitive data, forge signatures, or infiltrate secure lines of communication. AMD recently disclosed vulnerability AMD-SB-7055, which affects the RDSEED instruction on Zen 5 CPUs, including Ryzen 9000, Threadripper 9000, Ryzen AI 300, and Ryzen Z2. Specifically, 16-bit and 32-bit versions of RDseed may incorrectly return all zeroes. Even worse, they signal "success," meaning software assumes the value it has been provided, which is all zeroes, to be valid. In a nutshell, the software is being given all zeroes and the system thinks it's a randomly generated number. AMD has recognized the issue and is deploying microcode fixes via AGESA updates, which are scheduled to roll out on November 25, 2025, with full mitigation expected by January 2026. Best Deals: AMD Ryzen 9 7950X Desktop Processor Today 7 days ago 30 days ago - - $678.95 USD Buy - - $678.95 USD Buy - - £473.99 Buy - - $678.95 USD Buy $849 AUD $849 AUD $849 AUD Buy * Prices last scanned 2/15/2026 at 12:34 am CST - prices may be inaccurate. As an Amazon Associate, we earn from qualifying purchases. We earn affiliate commission from any Newegg or PCCG sales. NEWS SOURCES: techradar.com and amd.com Jak Connor Tech and Science Editor Jak joined TweakTown in 2017 and has since reviewed 100s of new tech products and kept us informed daily on the latest science, space, and artificial intelligence news. Jak's love for science, space, and technology, and, more specifically, PC gaming, began at 10 years old. It was the day his dad showed him how to play Age of Empires on an old Compaq PC. Ever since that day, Jak fell in love with games and the progression of the technology industry in all its forms. Jak's PC features AMD's Ryzen 7 9800X3D paired with the ASUS ROG Crosshair VIII HERO , G.Skill's Trident Z Neo 32GB DDR4 3600MHz , and NVIDIA's GeForce RTX 5080 FE . It runs WD_BLACK's SN8100 2TB with Windows 11 Pro, cooled by NZXT's Kraken 360mm with Thermal Grizzly's Duronaut thermal paste , housed in Lian Li's Lancool III , and powered by Corsair's RM1000x SHIFT . Accessories include the Logitech G915 LIGHTSPEED keyboard, Logitech G PRO Wireless mouse, and MSI MAG 274UPF monitor. Similar News Stories Netflix and A24 team up to adapt video game Overcooked into a reality TV show AMD confirms security vulnerability in every Zen 1 to Zen 5 processor Samsung Foundry in discussions with AMD to make next-gen EPYC 'Venice' CPUs on its 2nm node AMD's next-gen Zen 6 EPYC Venice CPU: over 70% more performance, 30% more thread density AMD teases future-gen Zen 7 CPUs, still many years away: new socket, motherboard by 2027+