High severity · published May 12, 2022
CVE-2021-26386
A malicious or compromised UApp or ABL may be used by an attacker to issue a malformed system call to the Stage 2 Bootloader potentially leading to corrupt memory and code…
7.8
CVSS
0.3%
EPSS
No
On KEV
Description
A malicious or compromised UApp or ABL may be used by an attacker to issue a malformed system call to the Stage 2 Bootloader potentially leading to corrupt memory and code execution.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
R3
Ryzen 3 2200u Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 2300u Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 3100 Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 3300g Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 3300x Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 5125c Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 5400u Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 5425c Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 5425u Firmware · Amd
All versions, or not specified · source: NVD
R5
Ryzen 5 2500u Firmware · Amd
All versions, or not specified · source: NVD
R5
Ryzen 5 2600 Firmware · Amd
All versions, or not specified · source: NVD
R5
Ryzen 5 2600h Firmware · Amd
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26386
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-26386
Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027
More from Ryzen 3 2200u Firmware
8.8
CVE-2023-20559
Insufficient control flow management in AmdCpmGpioInitSmm may allow a privileged attacker to tamper with the SMM handler potentially leading to escalation of privileges
8.8
CVE-2023-20558
Insufficient control flow management in AmdCpmOemSmm may allow a privileged attacker to tamper with the SMM handler potentially leading to an escalation of privileges
8.2
CVE-2021-26365
Certain size values in firmware binary headers could trigger out of bounds reads during signature validation, leading to denial of service or potentially limited leakage of…
7.8
CVE-2021-26384
A malformed SMI (System Management Interface) command may allow an attacker to establish a corrupted SMI Trigger Info data structure, potentially leading to out-of-bounds memory…
7.8
CVE-2021-26317
Failure to verify the protocol in SMM may allow an attacker to control the protocol and modify SPI flash resulting in a potential arbitrary code execution