CVE-2021-46967

vhost-vdpa: fix vm_flags for virtqueue doorbell mapping

Description

In the Linux kernel, the following vulnerability has been resolved: vhost-vdpa: fix vm_flags for virtqueue doorbell mapping The virtqueue doorbell is usually implemented via registeres but we don't provide the necessary vma->flags like VM_PFNMAP. This may cause several issues e.g when userspace tries to map the doorbell via vhost IOTLB, kernel may panic due to the page is not backed by page structure. This patch fixes this by setting the necessary vm_flags. With this patch, try to map doorbell via IOTLB will fail with bad address.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.04%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/3b8b6399666a29daa30b0bb3f5c9e3fc81c5a6a6	patch
https://git.kernel.org/stable/c/940230a5c31e2714722aee04c521a21f484b4df7	patch
https://git.kernel.org/stable/c/93dbbf20e3ffad14f04227a0b7105f6e6f0387ce	patch
https://git.kernel.org/stable/c/3a3e0fad16d40a2aa68ddf7eea4acdf48b22dd44	patch

Frequently Asked Questions

What is the severity of CVE-2021-46967?: CVE-2021-46967 has been scored as a medium severity vulnerability.
How to fix CVE-2021-46967?: To fix CVE-2021-46967, 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-2021-46967 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-46967 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-2021-46967?: CVE-2021-46967 affects Linux Linux, Linux Linux.

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