CVE-2026-23433
Description
A flaw was found in the Linux kernel's arm_mpam component. A local user with privileges to manage hardware components could trigger a null pointer dereference when a Memory System Controller (MSC) supporting memory bandwidth monitoring is brought offline and then online. This vulnerability, occurring in the __ris_msmon_read() function, causes a kernel oops, leading to a system crash and a Denial of Service (DoS).
Understanding the Weakness (CWE)
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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