CVE-2026-63993

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

0.51% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 41.6% 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 2026-07-30.

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 14:56Z1 MO AGO

Last updated

2026-08-05 12:37Z1 MO AGO

Reserved

2026-07-19

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

• CWE-825Expired Pointer DereferenceBase

Data version

5.2

Document digest

9983a2515a2619ebed4306b5da726607d9e3ead8e1d0289b10d51685c7e5b878

• git.kernel.orghttps://git.kernel.org/stable/c/6b8bfce9d2f774d2c2243e0248e03efb99bba6c0
• git.kernel.orghttps://git.kernel.org/stable/c/9257f56ac47ef1976bcd056cf986a9988eeec67a
• git.kernel.orghttps://git.kernel.org/stable/c/8d435d68d71fb875876b722f4136caf74f2f48bd
• git.kernel.orghttps://git.kernel.org/stable/c/dc3bfa050f873371e745bdf478b1f5b738e5733d
• git.kernel.orghttps://git.kernel.org/stable/c/609e63312c29aad18026a1d3222e123d4b6b0feb
• git.kernel.orghttps://git.kernel.org/stable/c/5303925e360527243b46a440a04667826bbc72b7
• git.kernel.orghttps://git.kernel.org/stable/c/a493efd4336cf19122ae0e4cbb3d31b32d70deea
• git.kernel.orghttps://git.kernel.org/stable/c/7d9ef0cb271555d8cf39fefe6c981e1493b25ecf