Security Advisory
CVE-2019-15031
CVE vulnerability detail — eXtreme Datacenter Security Operations
Description
In the Linux kernel through 5.2.14 on the powerpc platform, a local user can read vector registers of other users processes via an interrupt. To exploit the venerability, a local user starts a transaction (via the hardware transactional memory instruction tbegin) and then accesses vector registers. At some point, the vector registers will be corrupted with the values from a different local Linux process, because MSR_TM_ACTIVE is misused in arch/powerpc/kernel/process.c.