CVE-2021-47456

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 ImpacttotalSuccessful exploitation gives total 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 14.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Low. 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.

Published

2024-05-22 06:19Z2 YR AGO

Last updated

2026-05-11 13:55Z3 MO AGO

Reserved

2024-05-21

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 8.4)

CNA CVSS vector

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

Weaknesses

• CWE-416Use After FreeVariant
• CWE-467Use of sizeof() on a Pointer TypeVariant

Data version

5.2

Document digest

1be5d14d7a0cadbb1e0b854723981bfa536f9b707470b26e78541dd4096ef48c

• git.kernel.orghttps://git.kernel.org/stable/c/1c616528ba4aeb1125a06b407572ab7b56acae38
• git.kernel.orghttps://git.kernel.org/stable/c/447d44cd2f67a20b596ede3ca3cd67086dfd9ca9
• git.kernel.orghttps://git.kernel.org/stable/c/34914971bb3244db4ce2be44e9438a9b30c56250
• git.kernel.orghttps://git.kernel.org/stable/c/adbda14730aacce41c0d3596415aa39ad63eafd9
• git.kernel.orghttps://git.kernel.org/stable/c/1248582e47a9f7ce0ecd156c39fc61f8b6aa3699
• git.kernel.orghttps://git.kernel.org/stable/c/28f28e4bc3a5e0051faa963f10b778ab38c1db69
• git.kernel.orghttps://git.kernel.org/stable/c/0e5afdc2315b0737edcf55bede4ee1640d2d464d
• git.kernel.orghttps://git.kernel.org/stable/c/949fe9b35570361bc6ee2652f89a0561b26eec98