Advanced Micro Devices, Inc. AMD trended lower in Tuesday's pre-market session on news that some of its PC systems failed to reboot with Microsoft Corporation MSFT’s Windows patches.
Microsoft halted the fix for Intel Corporation INTC’s Meltdown and Spectre CPU flaws after the processor issues were reported.
“After investigating, Microsoft has determined that some AMD chipsets do not conform to the documentation previously provided to Microsoft to develop the Windows operating system mitigations to protect against the chipset vulnerabilities known as Spectre and Meltdown,” Microsoft wrote in a security advisory.
"AMD is aware of an issue with some older generational processors following installation of a Microsoft security update that was published over the weekend," AMD said in a statement to Reuters.
The firm halted nine operating system updates for AMD processors. It's unknown which CPUs were affected, but one report identified specific vulnerabilities in the Athlon and Sempron chips.
AMD and Microsoft are collaborating on a solution and will resume security updates at a later date.
AMD had previously profited on the flaw in Intel processors, riding a 20-percent pop.
At time of publication, AMD shares were set to open down 2 percent at $12.28.
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