CVE-2026-64534

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

0.42% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 34.6% 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

Received. NVD last modified this record on 2026-08-05.

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

2026-07-27 06:32Z1 MO AGO

Last updated

2026-08-05 12:42Z1 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-911Improper Update of Reference CountBase

Data version

5.2

Document digest

9f695c8f51a90e001e292fee290176d346a3f6d3d01c35d4072b3064464d1054

• git.kernel.orghttps://git.kernel.org/stable/c/22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf
• git.kernel.orghttps://git.kernel.org/stable/c/ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e
• git.kernel.orghttps://git.kernel.org/stable/c/c7874dad84b20433c0fe3919f291a762d40de08b
• git.kernel.orghttps://git.kernel.org/stable/c/e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1
• git.kernel.orghttps://git.kernel.org/stable/c/d306da8833e75f669d93424fd84940236f3850bc
• git.kernel.orghttps://git.kernel.org/stable/c/2ed3c9d955e8cd6361f130623baa664a75fb345f
• git.kernel.orghttps://git.kernel.org/stable/c/4606467a75cfc16721937272ed29462a750b60c8