CVE-2025-39694

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> s390/sclp: Fix SCCB present check<br /> <br /> Tracing code called by the SCLP interrupt handler contains early exits<br /> if the SCCB address associated with an interrupt is NULL. This check is<br /> performed after physical to virtual address translation.<br /> <br /> If the kernel identity mapping does not start at address zero, the<br /> resulting virtual address is never zero, so that the NULL checks won&amp;#39;t<br /> work. Subsequently this may result in incorrect accesses to the first<br /> page of the identity mapping.<br /> <br /> Fix this by introducing a function that handles the NULL case before<br /> address translation.