CVE-2021-47656

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

0.25% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 16.9% 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:N/UI:R/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

2025-02-26 01:54Z1 YR AGO

Last updated

2026-08-05 08:48Z1 MO AGO

Reserved

2025-02-26

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.2

Document digest

945616ccd0292dbb07f85b2c4971072a4694c3c3aa66aa5630d86727a299cba6

• git.kernel.orghttps://git.kernel.org/stable/c/9150cb625b46f68d524f4cfd491f1aafc23e10a9
• git.kernel.orghttps://git.kernel.org/stable/c/3bd2454162ec6bbb5503233c804fce6e4b6dcec5
• git.kernel.orghttps://git.kernel.org/stable/c/c3b07c875fa8f906f932976460fd14798596f101
• git.kernel.orghttps://git.kernel.org/stable/c/30bf7244acf32f19cb722c39f7bc1c2a9f300422
• git.kernel.orghttps://git.kernel.org/stable/c/7bb7428dd73991bf4b3a7a61b493ca50046c2b13
• git.kernel.orghttps://git.kernel.org/stable/c/7a75740206af5f17e9f3efa384211cba70213da1
• git.kernel.orghttps://git.kernel.org/stable/c/22327bd7988f21de3a53c1373f3b81542bfe1f44
• git.kernel.orghttps://git.kernel.org/stable/c/8c0f024f29e055840a5a89fe23b96ae3f921afed
• git.kernel.orghttps://git.kernel.org/stable/c/4c7c44ee1650677fbe89d86edbad9497b7679b5c