ZDI-26-684: Linux Kernel KSMBD Query Directory Request Race Condition Remote Code Execution Vulnerability

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. 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.orgVulnerability recordCVE-2026-64397

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-64397

  30-day exploitation probability 0.5%

  first.org
• Zero Day InitiativeCoordinated disclosureZDI-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