CVE-2022-49556
KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak
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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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee
- https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93
- https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0
- https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403
- https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418
References (5)
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- NONE
- Availability
- HIGH
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