CVE-2021-28039

Description

An issue was discovered in the Linux kernel 5.9.x through 5.11.3, as used with Xen. In some less-common configurations, an x86 PV guest OS user can crash a Dom0 or driver domain via a large amount of I/O activity. The issue relates to misuse of guest physical addresses when a configuration has CONFIG_XEN_UNPOPULATED_ALLOC but not CONFIG_XEN_BALLOON_MEMORY_HOTPLUG.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.14%
Vendor Advisory xen.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://xenbits.xen.org/xsa/advisory-369.html patch vendor advisory
http://www.openwall.com/lists/oss-security/2021/03/05/2 mailing list third party advisory patch
https://security.netapp.com/advisory/ntap-20210409-0001/ third party advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=882213990d32fd224340a4533f6318dd152be4b2

Frequently Asked Questions

What is the severity of CVE-2021-28039?
CVE-2021-28039 has been scored as a medium severity vulnerability.
How to fix CVE-2021-28039?
To fix CVE-2021-28039, 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-2021-28039 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-28039 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.
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