CVE-2026-64397
ZDI-26-684: Linux Kernel KSMBD Query Directory Request Race Condition Remote Code Execution Vulnerability
Published Sep 14, 2026
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel KSMBD. Authentication is not required to exploit this vulnerability. Furthermore, only systems with KSMBD enabled are vulnerable. The ZDI has assigned a CVSS rating of 9.0. The following CVEs are assigned: CVE-2026-64397.
Timeline
Detection, updates, and resolution for this record.
Sep 14, 2026 · Catalog
Detected
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel KSMBD. Authentication is not required to exploit this vulnerability. Furthermore, only systems with KSMBD enabled are vulnerable. The ZDI has assigned a CVSS rating of 9.0. The following CVEs are assigned: CVE-2026-64397.
Sources
- CVE.orgCVE-2026-64397
Official CVE identifier
cve.org - FIRST EPSSCVE-2026-64397
30-day exploitation probability 0.7%
first.org - Zero Day InitiativeZDI-26-684
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel KSMBD. Authentication is not required to exploit this vulnerability. Furthermore, only systems with KSMBD enabled are vulnerable. The ZDI has assigned a CVSS rating of 9.0. The following CVEs are assigned: CVE-2026-64397.
zerodayinitiative.com