DEBIAN-CVE-2025-21810

In the Linux kernel, the following vulnerability has been resolved: driver core: class: Fix wild pointer dereferences in API classdeviternext() There are a potential wild pointer dereferences issue regarding APIs classdeviter(init|next|exit)(), as explained by below typical usage: // All members of @iter are wild pointers. struct classdeviter iter; // classdeviterinit(@iter, @class, ...) checks parameter @class for // potential classtosubsys() error, and it returns void type and does // not initialize its output parameter @iter, so caller can not detect // the error and continues to invoke classdeviternext(@iter) even if // @iter still contains wild pointers. classdeviterinit(&iter, ...); // Dereference these wild pointers in @iter here once suffer the error. while (dev = classdeviternext(&iter)) { ... }; // Also dereference these wild pointers here. classdeviterexit(&iter); Actually, all callers of these APIs have such usage pattern in kernel tree. Fix by: - Initialize output parameter @iter by memset() in classdeviterinit() and give callers prompt by prcrit() for the error. - Check if @iter is valid in classdeviternext().