CVE-2025-39689

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ftrace: Also allocate and copy hash for reading of filter files<br /> <br /> Currently the reader of set_ftrace_filter and set_ftrace_notrace just adds<br /> the pointer to the global tracer hash to its iterator. Unlike the writer<br /> that allocates a copy of the hash, the reader keeps the pointer to the<br /> filter hashes. This is problematic because this pointer is static across<br /> function calls that release the locks that can update the global tracer<br /> hashes. This can cause UAF and similar bugs.<br /> <br /> Allocate and copy the hash for reading the filter files like it is done<br /> for the writers. This not only fixes UAF bugs, but also makes the code a<br /> bit simpler as it doesn&amp;#39;t have to differentiate when to free the<br /> iterator&amp;#39;s hash between writers and readers.