01 Record

CVE-2021-47230

KVM: x86: Immediately reset the MMU context when the SMM flag is cleared

MediumPUBLISHEDCNA: Linux

CNA base score6.6 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

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02 Description

KVM: x86: Immediately reset the MMU context when the SMM flag is cleared

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.23% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 14.2% of scored records. A rank, not a probability.

NVD base score

6.6 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-05-21 14:19Z2 YR AGO

Last updated

2026-05-11 13:50Z3 MO AGO

Reserved

2024-04-10

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Medium (CVSS 6.6)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H

Weaknesses

CWE-476NULL Pointer DereferenceBase

Data version

5.2

Document digest

695e2b522b610cb5e0c80d52fecc9a5428d8a7288f2782acb0103dab28113a5b

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux9ec19493fb86d6d5fbf9286b94ff21e56ef66376 to < cbb425f62df9df7abee4b3f068f7ed6ffc3561e2, 9ec19493fb86d6d5fbf9286b94ff21e56ef66376 to < 669a8866e468fd020d34eb00e08cb41d3774b71b, 9ec19493fb86d6d5fbf9286b94ff21e56ef66376 to < df9a40cfb3be2cbeb1c17bb67c59251ba16630f3, 9ec19493fb86d6d5fbf9286b94ff21e56ef66376 to < 78fcb2c91adfec8ce3a2ba6b4d0dda89f2f4a7c6, 5.1—

linuxlinux_kernel9ec19493fb86 to < cbb425f62df9, 9ec19493fb86 to < 669a8866e468, 9ec19493fb86 to < df9a40cfb3be, 9ec19493fb86 to < 78fcb2c91adf, 5.1—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/cbb425f62df9df7abee4b3f068f7ed6ffc3561e2
git.kernel.orghttps://git.kernel.org/stable/c/669a8866e468fd020d34eb00e08cb41d3774b71b
git.kernel.orghttps://git.kernel.org/stable/c/df9a40cfb3be2cbeb1c17bb67c59251ba16630f3
git.kernel.orghttps://git.kernel.org/stable/c/78fcb2c91adfec8ce3a2ba6b4d0dda89f2f4a7c6

01 Record index

CVE-2021-47230

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-47230

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References