Sami Tolvanen

**Name of the Vulnerable Software and Affected Versions** Linux kernel (affected versions not specified) **Description** A vulnerability in the Linux kernel has been identified, related to the usage of RCU NONIDLE during the ` cfi slowpath diag` function. This can result in an invalid RCU state in the cpuidle code path, leading to warnings and potential issues. The problem arises from the incorrect usage of RCU NONIDLE, which can cause the RCU state to become invalid when the cpuidle code path is executed. To address this, the solution involves calling `rcu irq enter` and `rcu irq exit` to wake up RCU only when necessary and disabling interrupts for the entire CFI shadow/module check. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.