CVE-2026-63979

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

0.61% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 46.9% 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 2026-08-09.

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 14:56Z1 MO AGO

Last updated

2026-08-09 18:34Z26 DAYS 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

6b40b7c581ffe18230a52563958f70673ef02848b59588043d1a1309c2bb05f0

• git.kernel.orghttps://git.kernel.org/stable/c/68eba6519cbd6359fb554a9720f3a3b6b2eba23f
• git.kernel.orghttps://git.kernel.org/stable/c/c06876d4fac38f35820946ee3b1be7d7da799cd4
• git.kernel.orghttps://git.kernel.org/stable/c/f4251190e58b209999c1ba9e6d2976136a1be055