CVE-2022-33744

Description

Arm guests can cause Dom0 DoS via PV devices When mapping pages of guests on Arm, dom0 is using an rbtree to keep track of the foreign mappings. Updating of that rbtree is not always done completely with the related lock held, resulting in a small race window, which can be used by unprivileged guests via PV devices to cause inconsistencies of the rbtree. These inconsistencies can lead to Denial of Service (DoS) of dom0, e.g. by causing crashes or the inability to perform further mappings of other guests' memory pages.

4.7

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.03%

Vendor Advisory debian.org Vendor Advisory xen.org Vendor Advisory xenproject.org

Affected: Linux Linux

References

Link	Tags
https://xenbits.xenproject.org/xsa/advisory-406.txt	vendor advisory
http://xenbits.xen.org/xsa/advisory-406.html	patch vendor advisory
http://www.openwall.com/lists/oss-security/2022/07/05/4	patch mailing list third party advisory
https://www.debian.org/security/2022/dsa-5191	third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html	third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2022-33744?: CVE-2022-33744 has been scored as a medium severity vulnerability.
How to fix CVE-2022-33744?: To fix CVE-2022-33744, 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-2022-33744 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-33744 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-2022-33744?: CVE-2022-33744 affects Linux Linux.

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