CVE-2026-23435
Description
A flaw was found in the Linux kernel's performance monitoring unit (PMU) subsystem. A race condition can occur during the unthrottling of performance events, leading to a mismatch between active performance counters and their corresponding event pointers. This can result in a NULL pointer dereference within the PMU's Non-Maskable Interrupt (NMI) handler, causing the system to crash and resulting in a Denial of Service (DoS).
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Modify Application Data; Modify Memory; DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands
It may be possible to cause data corruption and possibly execute arbitrary code by modifying global variables or data structures at unexpected times, violating the assumptions of code that uses this global data.
Access Control
Technical Impact: Gain Privileges or Assume Identity
If a signal handler interrupts code that is executing with privileges, it may be possible that the signal handler will also be executed with elevated privileges, possibly making subsequent exploits more severe.
Frequently Asked Questions
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