CVE-2026-63937

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

0.17% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 6.3% of scored records. A rank, not a probability.

NVD base score

8.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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

High (CVSS 8.8)

CNA CVSS vector

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

Weaknesses

• CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionBase

Data version

5.2

Document digest

f03e3830caabb1d87dd5d15558143edb288ec7c87299c8fad31e09e6ee4af8bb

• git.kernel.orghttps://git.kernel.org/stable/c/bd232801ef1d1fd985d2d4ca3cd1d888303ca86f
• git.kernel.orghttps://git.kernel.org/stable/c/b1dfaa6f7a957726a6800135be3659fbe4bbf2a4
• git.kernel.orghttps://git.kernel.org/stable/c/edbbe88f83b524434974e84808d3093199d67c24
• git.kernel.orghttps://git.kernel.org/stable/c/c8cc238093ca6c99267032f6cfe78f59389f3157