Detections
Analytics
CVE-2022-49556
medium
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak For some sev ioctl interfaces, the length parameter that is passed maybe less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data that PSP firmware returns. In this case, kmalloc will allocate memory that is the size of the input rather than the size of the data. Since PSP firmware doesn't fully overwrite the allocated buffer, these sev ioctl interface may return uninitialized kernel slab memory.
References
https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418
https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403
https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0
https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93
https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee