CVE-2026-63886

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

0.71% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 50.8% 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 2026-07-27.

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 14:54Z1 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-805Buffer Access with Incorrect Length ValueBase

Data version

5.2

Document digest

1c62fd58dc4f763dd275d1f549c059aeb5d5f40f73180b6a1e5b42256c832c44

• git.kernel.orghttps://git.kernel.org/stable/c/82454e6f21e56ea9a0a9de7d0ff7e1dfb83e34d6
• git.kernel.orghttps://git.kernel.org/stable/c/edd06675a02376ea8347dba7c29ad982ba5b36ee
• git.kernel.orghttps://git.kernel.org/stable/c/bf154c657828ed05399bca5d98cf1611bb048b12
• git.kernel.orghttps://git.kernel.org/stable/c/4a3a19c98a8207ad08bec554703d90f2c34a8cc6
• git.kernel.orghttps://git.kernel.org/stable/c/c04e85799356120209b351a148ac2db888d5ffd9
• git.kernel.orghttps://git.kernel.org/stable/c/85db7391310b1304d2dc8ae3b0b12105a9567147