KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.3%
exploitation probability
0.3%top 82% of all CVEs
observed exploitation
nono source reports it
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.
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285eehttps://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418