CVE-2021-46756

Description

Insufficient validation of inputs in SVC_MAP_USER_STACK in the ASP (AMD Secure Processor) bootloader may allow an attacker with a malicious Uapp or ABL to send malformed or invalid syscall to the bootloader resulting in a potential denial of service and loss of integrity.

Category

9.1
CVSS
Severity: Critical
CVSS 3.1 •
EPSS 0.11%
Vendor Advisory amd.com Vendor Advisory amd.com
Affected: AMD Ryzen™ 2000 series Desktop Processors “Raven Ridge” AM4
Affected: AMD Ryzen™ 2000 Series Desktop Processors “Pinnacle Ridge”
Affected: AMD Ryzen™ 3000 Series Desktop Processors “Matisse” AM4
Affected: AMD AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4
Affected: AMD Ryzen™ 5000 Series Desktop processor with Radeon™ Graphics “Cezanne” AM4
Affected: AMD 2nd Gen AMD Ryzen™ Threadripper™ Processors “Colfax”
Affected: AMD 3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT
Affected: AMD Ryzen™ Threadripper™ PRO Processors “Castle Peak” WS
Affected: AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Dali”/”Dali” ULP
Affected: AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Pollock”
Affected: AMD Ryzen™ 2000 Series Mobile Processors “Raven Ridge” FP5
Affected: AMD Ryzen™ 3000 Series Mobile processor, 2nd Gen AMD Ryzen™ Mobile Processors with Radeon™ Graphics “Picasso”
Affected: AMD Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics “Renoir”
Affected: AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Lucienne”
Affected: AMD Ryzen™ 5000 Series Mobile processors with Radeon™ Graphics “Cezanne”
Affected: AMD 1st Gen AMD EPYC™ Processors
Affected: AMD 2nd Gen AMD EPYC™ Processors
Affected: AMD 3rd Gen AMD EPYC™ Processors
Published at:
Updated at:

References

Link Tags
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001 vendor advisory
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-46756?
CVE-2021-46756 has been scored as a critical severity vulnerability.
How to fix CVE-2021-46756?
To fix CVE-2021-46756, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-46756 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-46756 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-46756?
CVE-2021-46756 affects AMD Ryzen™ 2000 series Desktop Processors “Raven Ridge” AM4, AMD Ryzen™ 2000 Series Desktop Processors “Pinnacle Ridge”, AMD Ryzen™ 3000 Series Desktop Processors “Matisse” AM4, AMD AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4, AMD Ryzen™ 5000 Series Desktop processor with Radeon™ Graphics “Cezanne” AM4, AMD 2nd Gen AMD Ryzen™ Threadripper™ Processors “Colfax”, AMD 3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT, AMD Ryzen™ Threadripper™ PRO Processors “Castle Peak” WS, AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Dali”/”Dali” ULP, AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Pollock”, AMD Ryzen™ 2000 Series Mobile Processors “Raven Ridge” FP5, AMD Ryzen™ 3000 Series Mobile processor, 2nd Gen AMD Ryzen™ Mobile Processors with Radeon™ Graphics “Picasso”, AMD Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics “Renoir” , AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Lucienne”, AMD Ryzen™ 5000 Series Mobile processors with Radeon™ Graphics “Cezanne”, AMD 1st Gen AMD EPYC™ Processors, AMD 2nd Gen AMD EPYC™ Processors, AMD 3rd Gen AMD EPYC™ Processors.
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