CVE-2021-47520

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

0.33% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 27.0% of scored records. A rank, not a probability.

NVD base score

7.8 (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:H/I:H/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.

Published

2024-05-24 15:09Z2 YR AGO

Last updated

2026-08-05 08:48Z2 MO AGO

Reserved

2024-05-24

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

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

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.2

Document digest

68d57b403cf3b19140f4957ecca63af9046909bf6c422640cbf8c5ed63ad737e

• git.kernel.orghttps://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d
• git.kernel.orghttps://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76
• git.kernel.orghttps://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3
• git.kernel.orghttps://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa
• git.kernel.orghttps://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4
• git.kernel.orghttps://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e
• git.kernel.orghttps://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7
• git.kernel.orghttps://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db