CVE-2026-63889

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

0.36% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 28.6% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 12:36Z1 MO AGO

Reserved

2026-07-19

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 8.1)

CNA CVSS vector

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

Weaknesses

• CWE-190Integer Overflow or WraparoundBase

Data version

5.2

Document digest

5b10dd5d999f1a483b62e01691fe5fc917ffa485b2d639c3fa8765fe5da8cdf8

• git.kernel.orghttps://git.kernel.org/stable/c/07776b7779c9426982c1ad74aad91bd531593790
• git.kernel.orghttps://git.kernel.org/stable/c/29f126f09e34a425b376b3646c89aa7cc18b142c
• git.kernel.orghttps://git.kernel.org/stable/c/163bd704d7515c3df6c2e03bcba93d1db79edbff
• git.kernel.orghttps://git.kernel.org/stable/c/ee57b89e5da9fffbe0d26647e4ff0750dacb9943
• git.kernel.orghttps://git.kernel.org/stable/c/35461d23744175a78b6280293892cca357c22793
• git.kernel.orghttps://git.kernel.org/stable/c/bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770
• git.kernel.orghttps://git.kernel.org/stable/c/a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153