Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-26340

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
10/12/2021
Last modified:
15/12/2021

Description

A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to flush the Translation Lookaside Buffer (TLB) resulting in unexpected behavior inside the virtual machine (VM).

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 8.40 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): High
Availability (A): None

Base Score 3.x
8.40
Severity 3.x
HIGH
Vector 2.0
AV:L/AC:L/Au:N/C:P/I:P/A:N CVSS v2.0 Severity and Metrics:

Base Score: 3.60 LOW
Vector: AV:L/AC:L/Au:N/C:P/I:P/A:N

Attack Vector (AV): Local
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): Physical
Availability (A): None

Base Score 2.0
3.60
Severity 2.0
LOW

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:amd:epyc_7001_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7001:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7232p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7232p:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7251_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7251:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7261_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7261:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7252_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7252:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_74f3_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_74f3:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7501_firmware:-:*:*:*:*:*:*:*
cpe:2.3:h:amd:epyc_7501:-:*:*:*:*:*:*:*
cpe:2.3:o:amd:epyc_7502_firmware:-:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools