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Tom’s Hardware
Tom’s Hardware
Technology
Hassam Nasir

AMD patches critical Zen 5 microcode bug — partners deliver new BIOS with AGESA 1.2.0.3C

AMD AGESA Google MSI
Ryzen 9000 CPU.

Motherboard vendors have started to deploy BIOS updates based on the AGESA 1.2.0.3C firmware. The new BIOS addresses a critical security vulnerability in AMD's Zen 5 chips found last month. This security flaw impacts Zen-based microprocessors across all product lines. While firmware updates patched Zen 1 to Zen 4, this vulnerability was only recently discovered with Zen 5.

According to AMD's security bulletin, the company relayed the updated firmware to motherboard vendors late last month. Due to the time each partner needs to integrate and validate new firmware for their unique BIOS on each motherboard model, we're only starting to see adoption now. So far, only MSI has the updated BIOS for some of its 800-series motherboards.

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