CVE-2026-23138

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> tracing: Add recursion protection in kernel stack trace recording<br /> <br /> A bug was reported about an infinite recursion caused by tracing the rcu<br /> events with the kernel stack trace trigger enabled. The stack trace code<br /> called back into RCU which then called the stack trace again.<br /> <br /> Expand the ftrace recursion protection to add a set of bits to protect<br /> events from recursion. Each bit represents the context that the event is<br /> in (normal, softirq, interrupt and NMI).<br /> <br /> Have the stack trace code use the interrupt context to protect against<br /> recursion.<br /> <br /> Note, the bug showed an issue in both the RCU code as well as the tracing<br /> stacktrace code. This only handles the tracing stack trace side of the<br /> bug. The RCU fix will be handled separately.