Linux Kernel KSMBD Request Buffer Use of Uninitialized Resource Information Disclosure Vulnerability

November 13th, 2026
ZDI-26-1004 ZDI-CAN-32436

CVE ID

CVSS Score

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

Affected Vendors

Linux

Affected Products

Kernel KSMBD

Vulnerability Details

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Linux Kernel KSMBD. Authentication is not required to exploit this vulnerability. However, only systems with ksmbd enabled are vulnerable.

The specific flaw exists within the ksmbd_conn_handler_loop functions. The issue results from the lack of proper initialization of memory prior to accessing it. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the kernel.

Additional Details

Linux has issued an update to correct this vulnerability. More details can be found at:
https://github.com/torvalds/linux/commit/bc0e0f5ac1d7b044d403f859406b4b66d4b1ce9b

Disclosure Timeline

  • 2026-09-02 - Vulnerability reported to vendor
  • 2026-11-13 - Coordinated public release of advisory
  • 2026-11-13 - Advisory Updated

Credit

Anonymous

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