A kernel data leak issue has been identified in the Linux kernel, specifically in the KVM: SVM component. The issue arises when using certain sev ioctl interfaces, where the length parameter passed may be less than or equal to SEV FW BLOB MAX SIZE but larger than the data returned by PSP firmware. As a result, kmalloc allocates memory based on the input size rather than the data size, and since PSP firmware does not fully overwrite the allocated buffer, these sev ioctl interfaces may return uninitialized kernel slab memory.