CVE-2026-23285

Description

A flaw was found in the Linux kernel's Distributed Replicated Block Device (DRBD) module. A local read error within the drbd_request_endio() function can lead to a null-pointer dereference. This occurs when a NULL peer device is incorrectly passed to the drbd_set_out_of_sync() function, causing the system to crash. This vulnerability can result in a Denial of Service (DoS).

Understanding the Weakness (CWE)

CWE-476

Availability

Technical Impact: DoS: Crash, Exit, or Restart

NULL pointer dereferences usually result in the failure of the process unless exception handling (on some platforms) is available and implemented. Even when exception handling is being used, it can still be very difficult to return the software to a safe state of operation.

Integrity,Confidentiality

Technical Impact: Execute Unauthorized Code or Commands; Read Memory; Modify Memory

In rare circumstances, when NULL is equivalent to the 0x0 memory address and privileged code can access it, then writing or reading memory is possible, which may lead to code execution.

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