CVE-2026-63940

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

0.18% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 8.1% of scored records. A rank, not a probability.

NVD base score

9.3 (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:C/C:H/I:H/A:H

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-07-27.

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

2026-07-19 14:55Z1 MO AGO

Last updated

2026-08-05 12:37Z1 MO AGO

Reserved

2026-07-19

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS vector

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

Weaknesses

• CWE-130Improper Handling of Length Parameter InconsistencyBase

Data version

5.2

Document digest

b3c7ee6af5b11cf11892601b00764daa8ee638a90644f4a24a26717801827387

• git.kernel.orghttps://git.kernel.org/stable/c/3b6035bc6bff20e89752ce4358bc4c9a9d5883f2
• git.kernel.orghttps://git.kernel.org/stable/c/2254972d4d69e279ba4e87bf0968eb08ad0d3c92
• git.kernel.orghttps://git.kernel.org/stable/c/c30cde934c7813b4e3069765dac64ce3d31e34f2
• git.kernel.orghttps://git.kernel.org/stable/c/3988bd2723de407ae90fa7a6f6029b4e60238c58