CVE-2026-63888

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

0.78% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 53.1% 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 2026-07-27.

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 12:36Z1 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-125Out-of-bounds ReadBase

Data version

5.2

Document digest

7e8a17daa6ccb92bd7962f96bb3495eafb5ac3a5a99f8086083c2101efa11b30

• git.kernel.orghttps://git.kernel.org/stable/c/f7948af0dd03de84079dcd4dc215a69fd6fbb95d
• git.kernel.orghttps://git.kernel.org/stable/c/badf178b76b0690851df00f4ca9cf2eb8eb0f963
• git.kernel.orghttps://git.kernel.org/stable/c/6e22a1cdcc8277af4acc43710577157b77a02c5d
• git.kernel.orghttps://git.kernel.org/stable/c/d3e9b79aa794f7a23e82de4d710e7d2df610e349
• git.kernel.orghttps://git.kernel.org/stable/c/ec9f19d52074a191ed1756ed4a7d39fff1a2085c
• git.kernel.orghttps://git.kernel.org/stable/c/89c81d1228c00fa6dd91de6c1c5aa1ef8a7875e3
• git.kernel.orghttps://git.kernel.org/stable/c/5118ea225fe63b44207ba88047e4866e1ea43812
• git.kernel.orghttps://git.kernel.org/stable/c/778c2ab142c625a8a8afa570e0f9b7873f445d99