CVE-2022-49556

KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak

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.

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee
https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418
https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0
https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93
https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403

Frequently Asked Questions

What is the severity of CVE-2022-49556?: CVE-2022-49556 has not yet been assigned a CVSS score.
How to fix CVE-2022-49556?: To fix CVE-2022-49556, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49556 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49556 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49556?: CVE-2022-49556 affects Linux Linux, Linux Linux.

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