CVE-2026-63984

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

0.51% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 41.8% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-07-30.

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 14:56Z1 MO AGO

Last updated

2026-08-05 12:37Z1 MO AGO

Reserved

2026-07-19

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

• CWE-190Integer Overflow or WraparoundBase

Data version

5.2

Document digest

7b96bc22dc30e267aa395c71b7d4668289918aec288c20df5898aa91cb1f039a

• git.kernel.orghttps://git.kernel.org/stable/c/75b3680047bf09af8e7e471a7a6ddf2ce5847f56
• git.kernel.orghttps://git.kernel.org/stable/c/fd238c51b0fa5390cceca9f1ac5a9ffda8063eed
• git.kernel.orghttps://git.kernel.org/stable/c/3618b34942b76471d044369bfd30d58c39068bf1
• git.kernel.orghttps://git.kernel.org/stable/c/97e06791368c01f0ad2a4b3269c2abe19485ca32
• git.kernel.orghttps://git.kernel.org/stable/c/de02fc049352af5a9595f015511222d0a85c326b
• git.kernel.orghttps://git.kernel.org/stable/c/6fe1cb312038516cb4d9fa089d700af7059f1a64
• git.kernel.orghttps://git.kernel.org/stable/c/c0487a9c1e116cf349e2d1f302d9019670460858
• git.kernel.orghttps://git.kernel.org/stable/c/9d5e7a46a9f6d8f503b41bfefef70659845f1679