01 Record

CVE-2021-46977

KVM: VMX: Disable preemption when probing user return MSRs

HighPUBLISHEDCNA: Linux

CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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02 Description

KVM: VMX: Disable preemption when probing user return MSRs

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

0.24% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 15.4% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-08-04.

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

2024-02-28 08:13Z2 YR AGO

Last updated

2026-08-05 08:45Z1 MO AGO

Reserved

2024-02-27

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

CWE-400Uncontrolled Resource ConsumptionClass

Data version

5.2

Document digest

902b17e9310666baa838835ab0fb42b00ba98ed9377ab43163443bdcd1075b7b

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux4be5341026246870818e28b53202b001426a5aec to < 31f29749ee970c251b3a7e5b914108425940d089, 4be5341026246870818e28b53202b001426a5aec to < 5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94, 4be5341026246870818e28b53202b001426a5aec to < e3ea1895df719c4ef87862501bb10d95f4177bed, 4be5341026246870818e28b53202b001426a5aec to < 5104d7ffcf24749939bea7fdb5378d186473f890, 5.5—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/31f29749ee970c251b3a7e5b914108425940d089
git.kernel.orghttps://git.kernel.org/stable/c/5adcdeb57007ccf8ab7ac20bf787ffb6fafb1a94
git.kernel.orghttps://git.kernel.org/stable/c/e3ea1895df719c4ef87862501bb10d95f4177bed
git.kernel.orghttps://git.kernel.org/stable/c/5104d7ffcf24749939bea7fdb5378d186473f890

01 Record index

CVE-2021-46977

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-46977

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References