CVE-2026-63938

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-1285Improper Validation of Specified Index, Position, or Offset in InputBase

Data version

5.2

Document digest

c059252f6774340e29e33c365809482851db3c102362992f71ce45e921a0c3e1

• git.kernel.orghttps://git.kernel.org/stable/c/5198f70c09a5f6e9e5f5a0a2c6b388f24294b176
• git.kernel.orghttps://git.kernel.org/stable/c/75c8d1d7291268b479794fba5808971dc2f5eaf3
• git.kernel.orghttps://git.kernel.org/stable/c/505a3b94535583e4265360e2621734e355ef263d
• git.kernel.orghttps://git.kernel.org/stable/c/121d88de56bc5c0ba0ce2f6381af67f948a7e7c1