CVE-2025-38257

In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Prevent overflow in size calculation for memdup_user() Number of apqn target list entries contained in 'nr_apqns' variable is determined by userspace via an ioctl call so the result of the product in calculation of size passed to memdup_user() may overflow. In this case the actual size of the allocated area and the value describing it won't be in sync leading to various types of unpredictable behaviour later. Use a proper memdup_array_user() helper which returns an error if an overflow is detected. Note that it is different from when nr_apqns is initially zero - that case is considered valid and should be handled in subsequent pkey_handler implementations. Found by Linux Verification Center (linuxtesting.org).

• linux linux kernel (>= 5.4 < 5.15.187) • linux linux kernel (>= 5.16 < 6.1.143) • linux linux kernel (>= 6.2 < 6.6.96) • linux linux kernel (>= 6.7 < 6.12.36) • linux linux kernel (>= 6.13 < 6.15.5) • linux linux kernel 6.16 • debian debian linux 11.0