CVE-2026-43122
Description
A flaw was found in the Linux kernel's Advanced Configuration and Power Interface (ACPI) cpuidle driver. Due to an update in the __acpi_processor_start() function, a NULL pointer dereference can occur if acpi_processor_power_init() is called without a cpuidle driver. This vulnerability could allow a local attacker to trigger a system crash, leading to 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.
Frequently Asked Questions
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