Advisory Details

   February 23rd, 2024

Linux Kernel ksmbd Mech Token Out-Of-Bounds Read Information Disclosure Vulnerability

  ZDI-24-194
  ZDI-CAN-22890

   CVE ID                CVE-2024-26594
   CVSS SCORE            9.3, AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
   AFFECTED VENDORS      Linux
   AFFECTED PRODUCTS     Kernel
                         This vulnerability allows remote attackers to disclose sensitive information on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability. However, only systems with ksmbd enabled are vulnerable.
   VULNERABILITY DETAILS
                         The specific flaw exists within the handling of SMB2 Mech Tokens. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. 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/92e470163d96df8db6c4fa0f484e4a229edb903d
   DISCLOSURE TIMELINE     • 2024-01-11 - Vulnerability reported to vendor
                           • 2024-02-23 - Coordinated public release of advisory
   CREDIT                fffvr