Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Local
0

CVE-2021-26342

Disclosure Date: May 10, 2022 •
CVE-2021-26342 CVSS v3 Base Score: 3.3
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

In SEV guest VMs, the CPU may fail to flush the Translation Lookaside Buffer (TLB) following a particular sequence of operations that includes creation of a new virtual machine control block (VMCB). The failure to flush the TLB may cause the microcode to use stale TLB translations which may allow for disclosure of SEV guest memory contents. Users of SEV-ES/SEV-SNP guest VMs are not impacted by this vulnerability.

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CVSS V3 Severity and Metrics
Base Score:
3.3 Low
Impact Score:
1.4
Exploitability Score:
1.8
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack Vector (AV):
Local
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
Low
Integrity (I):
None
Availability (A):
None

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
EPYC™ Processors various
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • amd

Products

  • epyc 7001 firmware,
  • epyc 7251 firmware,
  • epyc 7261 firmware,
  • epyc 7281 firmware,
  • epyc 72f3 firmware,
  • epyc 7301 firmware,
  • epyc 7313 firmware,
  • epyc 7313p firmware,
  • epyc 7343 firmware,
  • epyc 7351 firmware,
  • epyc 7351p firmware,
  • epyc 7371 firmware,
  • epyc 7373x firmware,
  • epyc 73f3 firmware,
  • epyc 7401 firmware,
  • epyc 7401p firmware,
  • epyc 7413 firmware,
  • epyc 7443 firmware,
  • epyc 7443p firmware,
  • epyc 7451 firmware,
  • epyc 7453 firmware,
  • epyc 7473x firmware,
  • epyc 74f3 firmware,
  • epyc 7501 firmware,
  • epyc 7513 firmware,
  • epyc 7543 firmware,
  • epyc 7543p firmware,
  • epyc 7551 firmware,
  • epyc 7551p firmware,
  • epyc 7573x firmware,
  • epyc 75f3 firmware,
  • epyc 7601 firmware,
  • epyc 7643 firmware,
  • epyc 7663 firmware,
  • epyc 7713 firmware,
  • epyc 7713p firmware,
  • epyc 7763 firmware,
  • epyc 7773x firmware

Additional Info

Authenticated
Unknown
Exploitable
Unknown
Reliability
Unknown
Stability
Unknown
Available Mitigations
Unknown
Shelf Life
Unknown
Userbase/Installbase
Unknown
Patch Effectiveness
Unknown
Technical Analysis