CVE-2026-63921

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 7.4% of scored records. A rank, not a probability.

NVD base score

8.8 (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:C/C:H/I:H/A:H

NVD analysis status

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

Red Hat severity

Important. 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

High (CVSS 8.8)

CNA CVSS vector

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

Weaknesses

• CWE-653Improper Isolation or CompartmentalizationClass

Data version

5.2

Document digest

bcd45e19472a2b59bd78891f8c6d1f8eba927caca3dc7ecc10312727edd80002

• git.kernel.orghttps://git.kernel.org/stable/c/94ff740a7f9ef5c010784a325dca00cbf228f941
• git.kernel.orghttps://git.kernel.org/stable/c/df42ac708acc3399bbb6dc5ca16e0540adda7bbf
• git.kernel.orghttps://git.kernel.org/stable/c/44d2ff7d2178503b93151140a45dfa2ad49c9906
• git.kernel.orghttps://git.kernel.org/stable/c/1acfb7d9c6fc7e209ed7789392697e97e03edd33
• git.kernel.orghttps://git.kernel.org/stable/c/d2236348414bdd6558385f35aa7fdc9bf5634011
• git.kernel.orghttps://git.kernel.org/stable/c/853f6ea482dfcd3404bbef458ab4d68364eed838
• git.kernel.orghttps://git.kernel.org/stable/c/596f6354c96a891e58c04a09cbfb7b0d1ec00dab
• git.kernel.orghttps://git.kernel.org/stable/c/8b484efd5cb4eeef9021a661e198edc5349dacf6