Bug 2135267 (CVE-2022-33747) - CVE-2022-33747 xen: unbounded memory consumption for 2nd-level page tables
Summary: CVE-2022-33747 xen: unbounded memory consumption for 2nd-level page tables
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2022-33747
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2135268
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-10-17 07:21 UTC by Marian Rehak
Modified: 2022-11-29 22:18 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2022-11-29 22:18:26 UTC


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Description Marian Rehak 2022-10-17 07:21:09 UTC
Arm: unbounded memory consumption for 2nd-level page tables Certain actions require e.g. removing pages from a guest's P2M (Physical-to-Machine) mapping. When large pages are in use to map guest pages in the 2nd-stage page tables, such a removal operation may incur a memory allocation (to replace a large mapping with individual smaller ones). These memory allocations are taken from the global memory pool. A malicious guest might be able to cause the global memory pool to be exhausted by manipulating its own P2M mappings.

Reference:

https://xenbits.xenproject.org/xsa/advisory-409.txt
http://xenbits.xen.org/xsa/advisory-409.html

Comment 1 Marian Rehak 2022-10-17 07:21:23 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 2135268]

Comment 2 Product Security DevOps Team 2022-11-29 22:18:25 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.


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